
/*

  SmartClient Ajax RIA system
  Version v9.1p_2021-05-18/LGPL Deployment (2021-05-18)

  Copyright 2000 and beyond Isomorphic Software, Inc. All rights reserved.
  "SmartClient" is a trademark of Isomorphic Software, Inc.

  LICENSE NOTICE
     INSTALLATION OR USE OF THIS SOFTWARE INDICATES YOUR ACCEPTANCE OF
     ISOMORPHIC SOFTWARE LICENSE TERMS. If you have received this file
     without an accompanying Isomorphic Software license file, please
     contact licensing@isomorphic.com for details. Unauthorized copying and
     use of this software is a violation of international copyright law.

  DEVELOPMENT ONLY - DO NOT DEPLOY
     This software is provided for evaluation, training, and development
     purposes only. It may include supplementary components that are not
     licensed for deployment. The separate DEPLOY package for this release
     contains SmartClient components that are licensed for deployment.

  PROPRIETARY & PROTECTED MATERIAL
     This software contains proprietary materials that are protected by
     contract and intellectual property law. You are expressly prohibited
     from attempting to reverse engineer this software or modify this
     software for human readability.

  CONTACT ISOMORPHIC
     For more information regarding license rights and restrictions, or to
     report possible license violations, please contact Isomorphic Software
     by email (licensing@isomorphic.com) or web (www.isomorphic.com).

*/
//> @class DateUtil
// Static singleton class containing APIs for interacting with Dates.
// @treeLocation Client Reference/System
// @visibility external
//<

isc.defineClass("DateUtil");

isc.DateUtil.addClassMethods({

    _min : function (date1, date2) {
        
        return (date1.getTime() < date2.getTime() ? date1 : date2);
    },
    
    _max : function (date1, date2) {
        
        return (date1.getTime() < date2.getTime() ? date2 : date1);
    },

    //>	@classMethod		DateUtil.format()
    // Return the parameter date formatted according to the parameter +link{type:FormatString}.  
    // This method is used to implement the +link{DataSourceField.format,DataSourceField.format}
    // functionality, but it can also be used to format arbitrary dates programmatically.
    // @group dateFormatting
    // @param  date    (Date) The date to format
    // @param  format  (FormatString) The format to apply to this date
    // @return (String) formatted date string
    // @visibility external
    //<
    // This method is ultimately based on code from the DateJS library (www.datejs.com), refactored
    // to remove dependencies on that library's support structures and i18n approaches and integrate
    // the SmartClient i18n system.  It is also enhanced to support more of the functionality of 
    // Java's SimpleDateFormat class, and to support fiscal days, weeks and years.
    format : function (date, format) {

        if (!isc.isA.String(format)) {
            isc.logWarn("Cannot use Date format '" + format + "' - not a String");
            return date.toString();
        }

        var p = function p(s) {
            return (s.toString().length == 1) ? "0" + s : s;
        };

        return format ? format.replace(/dd?d?d?|EE?E?E?|MM?M?M?|yy?y?y?|YY?Y?Y?|LL?L?L?|ww?|CC?|cc?|DD?|hh?|HH?|mm?|ss?|a|u/g, 
        function (innerFormat) {
            switch (innerFormat) {
            case "hh":
                var hour = date.getHours();
                if (format.contains("a") && hour == 0) hour = 12;
                return p(hour < 13 ? hour : (hour - 12));
            case "h":
                var hour = date.getHours();
                if (format.contains("a") && hour == 0) hour = 12;
                return hour < 13 ? hour : (hour - 12);
            case "HH":
                var hour = date.getHours();
                if (format.contains("a") && hour == 0) hour = 12;
                return p(hour);
            case "H":
                var hour = date.getHours();
                if (format.contains("a") && hour == 0) hour = 12;
                return hour;
            case "mm":
                return p(date.getMinutes());
            case "m":
                return date.getMinutes();
            case "ss":
                return p(date.getSeconds());
            case "s":
                return date.getSeconds();
            case "yyyy":
                return date.getFullYear();
            case "yy":
                return date.getFullYear().toString().substring(2, 4);
            case "YYYY":
                return isc.DateUtil.getWeekNumber(date)[0];
            case "YY":
                return isc.DateUtil.getWeekNumber(date)[0].toString().substring(2, 4);
            case "dddd":
            case "EEEE":
                return date.getDayName();
            case "ddd":
            case "E":
            case "EE":
            case "EEE":
                return date.getShortDayName();
            case "dd":
                return p(date.getDate());
            case "d":
                return date.getDate().toString();
            case "DD":
                return p(isc.DateUtil.getDayNumber(date));
            case "D":
                return isc.DateUtil.getDayNumber(date).toString();
            case "u":
                return (date.getDay() || 7) + "";
            case "MMMM":
                return date.getMonthName();
            case "MMM":
                return date.getShortMonthName();
            case "MM":
                return p((date.getMonth() + 1));
            case "M":
                return date.getMonth() + 1;
            case "w":
                return isc.DateUtil.getWeekNumber(date)[1];
            case "ww":
                return p(isc.DateUtil.getWeekNumber(date)[1]);
            case "a":
                return date.getHours() < 12 ? isc.Time.AMIndicator : isc.Time.PMIndicator;
            default:
                return "";
            }
        }
        ) : "";
    },

    getWeekNumber : function(date) {
        var d = new Date(date);
        d.setHours(0,0,0);
        // The ISO standard is: the first week of a year is the one that contains the year's 
        // first Thursday.  http://en.wikipedia.org/wiki/ISO-8601#Week_dates
        d.setDate(d.getDate() + 4 - (d.getDay()||7));
        // Get first day of year
        var yearStart = new Date(d.getFullYear(),0,1);
        // Calculate full weeks to nearest Thursday
        var weekNo = Math.ceil(( ( (d - yearStart) / 86400000) + 1)/7);
        // Return array of year and week number
        return [d.getFullYear(), weekNo];
    },
    
    getDayNumber : function(date) {
        var d = new Date(date);
        d.setHours(0,0,0);
        var yearStart = new Date(d.getFullYear(),0,1);
        return Math.ceil(((d - yearStart) / 86400000) + 1);
    },

    //> @classMethod DateUtil.createLogicalDate()
    // Create a new Date to represent a logical date value (rather than a specific datetime value),
    // typically for display in a +link{DataSourceField.type,date type field}. The generated
    // Date value will have year, month and date set to the specified values
    // (in browser native local time).
    // @param year (int) full year
    // @param month (int) month (zero based, so 0 is January)
    // @param date (int) date within the month
    // @return (Date) new javascript Date object representing the Date in question
    // @visibility external
    //<
    // For logical dates, the only requirement for the "time" component value is that the
    // date shows up correctly in local time.
    
    createLogicalDate : function (year, month, date, suppressConversion) {
        var d = new Date();
        d.setHours(12, 0, 0, 0);
        year = (year != null ? year : d.getFullYear());
        month = (month != null ? month : d.getMonth());
        date = (date != null ? date : d.getDate());
        d.setFullYear(year, month, date);

        if (suppressConversion) {
            // If the 'suppressConversion' flag was passed, we will want to return null to indicate
            // we were passed an invalid date if the values passed in had to be converted
            // (For example a month of 13 effecting the year, etc)
            var isValid = (d.getFullYear() == year &&
                           d.getMonth() == month &&
                           d.getDate() == date );
            if (!isValid) return null;
        }

        d.logicalDate = true;
        return d;
    }
});

//>	@class Date
//
//	Extensions to the Date class, including added static methods on the Date object, and
//  additional instance methods available on all date instances.
//
//  @treeLocation Client Reference/System
//  @visibility external
//<

//>	@classMethod    isc.timeStamp()
//  Shorthand for <code>new Date().getTime();</code>, this returns a timeStamp - a large number
//  which is incremented by 1 every millisecond.  Can be used to generate unique identifiers,
//  or perform timing tasks.
//
//  @visibility external
//	@return	(int)	a large integer (actually the number of milliseconds since 1/1/1970)
//<

isc.addGlobal("timeStamp", function () {
    
    return new Date().getTime()
});


// synonym
isc.addGlobal("timestamp", isc.timeStamp);


  //>DEBUG
// This lets us label methods with a name within addMethods
Date.prototype.Class = "Date";
Date.Class = "Date";
  //<DEBUG


isc.Date = Date;


isc.addProperties(Date, {
    // add a constant for an error message when attempting to convert an invalid string to a
    // date
    INVALID_DATE_STRING:"Invalid date format"
});


//
// add methods to the Date object itself for parsing additional formats
//
isc.addMethods(Date, {

//>	@classMethod	Date.newInstance()
//			Cover function for creating a date in the 'Isomorphic-style',
//				eg:   Date.newInstance(args)
//			rather than new Date(args)
//		@return				(Date)		Date object
//      @deprecated As of SmartClient 5.5, use +link{Date.create}.
//<
newInstance : function (arg1, arg2, arg3, arg4, arg5, arg6, arg7) {
	return new Date(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
},


//>	@classMethod	Date.create()
//  Create a new <code>Date</code> object - synonym for <code>new Date(arguments)</code>
//	@return (Date) Date object
//  @visibility external
//<
create : function (arg1, arg2, arg3, arg4, arg5, arg6, arg7) {
    // handle being passed a subset of parameters
    // Note that passing undefined into new Date() results in an invalid date where
    // getTime() returns NaN
    var undef;
    if (arg1 === undef) return new Date();
    if (arg2 === undef) return new Date(arg1);
    if (arg3 === undef) arg3 = 0;
    if (arg4 === undef) arg4 = 0;
    if (arg5 === undef) arg5 = 0;
    if (arg6 === undef) arg6 = 0;
    if (arg7 === undef) arg7 = 0;
	return new Date(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
},

//> @classMethod Date.createLogicalDate()
// Create a new Date to represent a logical date value (rather than a specific datetime value),
// typically for display in a +link{DataSourceField.type,date type field}. The generated
// Date value will have year, month and date set to the specified values
// (in browser native local time).
// @param year (int) full year
// @param month (int) month (zero based, so 0 is January)
// @param date (int) date within the month
// @return (Date) new javascript Date object representing the Date in question
// @visibility external
//<

createLogicalDate : function (year, month, date, suppressConversion) {
    return isc.DateUtil.createLogicalDate(year, month, date, suppressConversion);
},

//> @classMethod Date.createLogicalTime()
// Create a new Date object to represent a logical time value (rather than a specific datetime
// value), typically for display in a +link{DataSourceField.type,time type field}. The generated
// Date value will have year, month and date set to the epoch date (Jan 1 1970), and time
// elements set to the supplied hour, minute and second (in browser native local time).
// @param hour (int) hour (0-23)
// @param minute (int) minute (0-59)
// @param second (int) second (0-59)
// @return (Date) new Javascript Date object representing the time in question
// @visibility external
//<
// This is a synonym for Time.createLogicalTime();
createLogicalTime : function (hour, minute, second, millisecond) {
    return isc.Time.createLogicalTime(hour,minute,second,millisecond);
},

createDatetime : function (year, month, date, hours, minutes, seconds, milliseconds, suppressConversion) {
    var hasHours = hours != null,
        hasMinutes = minutes != null,
        hasSeconds = seconds != null;

    // Handle being passed strings
    if (isc.isA.String(hours)) hours = parseInt(hours || 12, 10);
    if (isc.isA.String(minutes)) minutes = parseInt(minutes || 0, 10);
    if (isc.isA.String(seconds)) seconds = parseInt(seconds || 0, 10);

    var newDate;
    if (!isc.Time._customTimezone) {
        newDate = new Date(year, month, date);
        if (hasHours) {
            if (milliseconds != null) newDate.setHours(hours, minutes, seconds, milliseconds);
            else if (hasSeconds) newDate.setHours(hours, minutes, seconds);
            else if (hasMinutes) newDate.setHours(hours, minutes);
            else newDate.setHours(hours);
        }

        if (!suppressConversion) return newDate;

        // If the 'suppressConversion' flag was passed, we will want to return null to indicate
        // we were passed an invalid date if the values passed in had to be converted
        // (For example a month of 13 effecting the year, etc)
        var isValid = (newDate.getFullYear() == year &&
                       newDate.getMonth() == month &&
                       newDate.getDate() == date &&
                       (!hasHours || newDate.getHours() == hours) &&
                       (!hasMinutes || newDate.getMinutes() == minutes) &&
                       (!hasSeconds || newDate.getSeconds() == seconds)
                       );
        return (isValid ? newDate : null);
    } else {

        // We need a date where the UTCTime is set such that when we apply our
        // custom timezone offset we get back the local time.
        // Do this by creating a new date with UTC time matching this custom display time
        // and then shifting that date by the inverse of our display timezone offset.
        if (hours == null) hours = 0;
        if (minutes == null) minutes = 0;
        if (seconds == null) seconds = 0;
        if (milliseconds == null) milliseconds = 0;

        newDate = new Date(Date.UTC(year, month, date, hours, minutes, seconds, milliseconds));
        // If the 'suppressConversion' flag was passed, we will want to return null to indicate
        // we were passed an invalid date if the values passed in had to be converted
        // (For example a month of 13 effecting the year, etc)
        // Easiest to check this against the date before we apply the offset to correct for
        // our timezone
        if (suppressConversion) {
            var isValid = (newDate.getUTCFullYear() == year &&
                           newDate.getUTCMonth() == month &&
                           newDate.getUTCDate() == date &&
                           (!hasHours || newDate.getUTCHours() ==hours) &&
                           (!hasMinutes || newDate.getUTCMinutes() == minutes) &&
                           (!hasSeconds || newDate.getUTCSeconds() == seconds)
                           );
            if (!isValid) newDate = null;
        }
        if (newDate != null) {
            // Subtract the UTCHoursDisplayOffset and UTCMinutesDisplayOffset, then adjust
            // for DST if required.
            
            newDate._applyTimezoneOffset(
                -isc.Time.UTCHoursDisplayOffset,
                -isc.Time.UTCMinutesDisplayOffset
            );

            newDate._applyTimezoneOffset(-isc.Time.getUTCHoursDisplayOffset(newDate, 0),
                                         -isc.Time.getUTCMinutesDisplayOffset(newDate, 0));
        }
        return newDate;
    }
},

//> @classMethod Date.getLogicalDateOnly()
// Get a logical date - a value appropriate for a DataSourceField of type "date" - from a
// datetime value (a value from a DataSourceField of type "datetime").
// <P>
// This method correctly takes into account the current
// +link{Time.setDefaultDisplayTimezone,display timezone}, specifically, the returned Date
// will reflect the day, month and year that appears when the datetime is rendered
// by a SmartClient component rather than the date values that would be returned by
// Date.getDay() et al (which can differ, since getDay() uses the browser's local timezone).
// <P>
// For further background on date, time and datetime types, storage and transmission, see
// +link{group:dateFormatAndStorage,this overview}.
//
// @param date (Date) a Date instance representing a datetime value
// @return (Date) a Date instance representing just the date portion of the datetime value, as
//                a logical date
// @visibility external
//<
getLogicalDateOnly : function (datetime) {
    if (!isc.isA.Date(datetime)) {
        isc.logWarn("getLogicalDateOnly() passed invalid value:" + datetime
            + ". Returning null.");
        return null;
    }
    var year,month,day;
    // handle being passed something that's already a logical date
    if (datetime.logicalDate) {
        year = datetime.getFullYear();
        month = datetime.getMonth();
        day = datetime.getDate();
    } else {
        var offsetDate = datetime._getTimezoneOffsetDate(
                            isc.Time.getUTCHoursDisplayOffset(datetime),
                            isc.Time.getUTCMinutesDisplayOffset(datetime)
                         );
        offsetDate._applyTimezoneOffset(0, offsetDate.getTimezoneOffset());

        month = offsetDate.getMonth();
        day = offsetDate.getDate();
        year = offsetDate.getFullYear();
    }

    return this.createLogicalDate(year, month, day);
},

//> @classMethod Date.getLogicalTimeOnly()
// Get a logical time - a value appropriate for a DataSourceField of type "time" - from a
// datetime value (a value from a DataSourceField of type "datetime").
// <P>
// This method correctly takes into account the current
// +link{Time.setDefaultDisplayTimezone,display timezone}, specifically, the returned Date will
// reflect the hour, minute and second that appears when the datetime is rendered by a SmartClient
// component rather than the time values that would be returned by Date.getHours() et al (which
// can differ, since getHours() uses the browser's local timezone).
// <P>
// For further background on date, time and datetime types, storage and transmission, see
// +link{group:dateFormatAndStorage,this overview}.
//
// @param date (Date) a Date instance representing a datetime value
// @return (Date) a Date instance representing just the time portion of the datetime value, as
//                a logical time
// @visibility external
//<
getLogicalTimeOnly : function (datetime) {
    if (!isc.isA.Date(datetime)) {
        isc.logWarn("getLogicalTimeOnly() passed invalid value:" + datetime
            + ". Returning null.");
        return null;
    }

    var offsetHours = 0, offsetMinutes = 0;
    if (!datetime.logicalTime) {
        offsetHours = isc.Time.getUTCHoursDisplayOffset(datetime);
        offsetMinutes = isc.Time.getUTCMinutesDisplayOffset(datetime) +
                        datetime.getTimezoneOffset();
    }

    return this.createLogicalTime(datetime.getHours() + offsetHours, datetime.getMinutes() + offsetMinutes,
                                  datetime.getSeconds(), datetime.getMilliseconds());
},


//> @classMethod Date.combineLogicalDateAndTime()
// Combine a logical date (a value appropriate for a DataSourceField of type "date") with a
// logical time (a value appropriate for a DataSourceField of type "time") into a datetime
// value (a value appropriate for a DataSourceField of type "datetime")
// <P>
// This method correctly takes into account the current
// +link{Time.setDefaultDisplayTimezone,display timezone}, specifically, the returned datetime
// value will show the same date and time as the passed date and time objects when rendered by
// a SmartClient component that has been configured with a field of type "datetime".
// <P>
// For further background on date, time and datetime types, storage and transmission, see
// +link{group:dateFormatAndStorage,this overview}.
//
// @param date (Date) a Date instance representing logical date value
// @param time (Date) a Date instance representing logical time value
// @return (Date) a Date instance representing a datetime value combining the logical date and
//                time passed
// @visibility external
//<
combineLogicalDateAndTime : function (date, time) {
    var hasDate = isc.isA.Date(date),
        hasTime = isc.isA.Date(time);
    if (!hasDate || !hasTime) {
        // date only, convert from logical date to datetime.
        if (hasDate) {
            // pass in the result of 'getFullYear()' etc. These numbers are the correct
            // abs values - createDatetime will handle shifting them to account for
            // timezones.
            return this.createDatetime(date.getFullYear(), date.getMonth(), date.getDate(), 0,0,0);
        } else if (hasTime) {
            // We could log a warning and bail in this case. However may as well just
            // give back a datetime with the same time value as the 'time' passed in.
            return time.duplicate();
        } else {
            isc.logWarn("combineLogicalDateAndTime passed invalid parameters:"
                 + date + " and " + time + ". Returning null.");
            return null;
        }
    }

    // Get hours / minutes in display timezone.
    var hour = time.getHours(),
        minutes = time.getMinutes();
    return this.createDatetime(
                date.getFullYear(), date.getMonth(), date.getDate(),
                hour, minutes, time.getSeconds(), time.getMilliseconds()
           );
},


//>	@classMethod	Date.compareDates()
// Compare two dates; returns 0 if equal, -1 if the first date is greater (later), or 1 if
// the second date is greater.  If either value is not a Date object, it is treated as the
// epoch (midnight on Jan 1 1970) for comparison purposes.
//  @param  date1   (date)  first date to compare
//  @param  date2   (date)  second date to compare
//  @return (int)    0 if equal, -1 if first date &gt; second date, 1 if second date &gt; first date
// @visibility external
//<
compareDates : function (a, b) {
    if (a == b) return 0; // same date instance
	var aval = (isc.isA.Date(a) ? a.getTime() : 0),
        bval = (isc.isA.Date(b) ? b.getTime() : 0);
	return aval > bval ? -1 : (bval > aval ? 1 : 0);
},

//>	@classMethod	Date.compareLogicalDates()
// Compare two dates, normalizing out the time elements so that only the date elements are
// considered; returns 0 if equal, -1 if the first date is greater (later), or 1 if
// the second date is greater.
//  @param  date1   (date)  first date to compare
//  @param  date2   (date)  second date to compare
//  @return (int)    0 if equal, -1 if first date &gt; second date, 1 if second date &gt;
//                      first date.  Returns false if either argument is not a date
// @visibility external
//<
compareLogicalDates : function (a, b) {
    if (a == b) return 0; // same date instance
    if (!isc.isA.Date(a) || !isc.isA.Date(b)) return false; // bad arguments, so return false
	var aYear = a.getFullYear(),
	    aMonth = a.getMonth(),
	    aDay = a.getDate(),
	    bYear = b.getFullYear(),
	    bMonth = b.getMonth(),
	    bDay = b.getDate();

    var aval = aYear * 10000 + aMonth * 100 + aDay,
        bval = bYear * 10000 + bMonth * 100 + bDay;

	return aval > bval ? -1 : (bval > aval ? 1 : 0);
},

// `month' begins at 0.
getJulianDayNumber : function (year, month, date) {
    // http://quasar.as.utexas.edu/BillInfo/JulianDatesG.html
    var y = year,
        m = month + 1,
        d = date;

    if (m <= 2) {
        --y;
        m += 12;
    }
    var a = parseInt(y / 100),
        b = parseInt(a / 4),
        c = 2 - a + b,
        e = parseInt(365.25 * (y + 4716)),
        f = parseInt(30.6001 * (m + 1))
    return c + d + e + f - 1524;
},

_getWeekdayCounts : function () {
    var weekendDays = isc.Date.getWeekendDays();
    var weekdayCounts = weekendDays._weekdayCounts;
    if (!weekdayCounts) {
        var isWeekend = {}, numWeekends = 0;
        for (var i = 0; i < weekendDays.length; ++i) {
            if (!isWeekend[weekendDays[i]]) {
                ++numWeekends;
                isWeekend[weekendDays[i]] = true;
            }
        }

        weekdayCounts = [];
        for (var d = 0; d <= 6; ++d) {
            var weekdayCount = 0;
            var counts = [ 0 ];
            for (var dd = 1; dd < 7; ++dd) {
                if (!isWeekend[(d + dd - 1) % 7]) ++weekdayCount;
                counts.push(weekdayCount);
            }
            weekdayCounts[d] = counts;
        }
        weekdayCounts._numWeekends = numWeekends;
        weekendDays._weekdayCounts = weekdayCounts;
    }
    return weekdayCounts;
},

_getDayDiff : function (date1, date2, weekdaysOnly, useCustomTimezone) {
    var logicalDate1, logicalDate2;
    var compareRes = isc.Date.compareDates(date1, date2);
    var sign = (compareRes > 0 ? 1 : -1);
    if (compareRes >= 0) { // `date1' is before `date2'.
        if (useCustomTimezone !== false) {
            logicalDate1 = isc.Date.getLogicalDateOnly(date1);
            logicalDate2 = isc.Date.getLogicalDateOnly(date2);
        } else {
            logicalDate1 = date1;
            logicalDate2 = date2;
        }
    } else {
        if (useCustomTimezone !== false) {
            logicalDate1 = isc.Date.getLogicalDateOnly(date2);
            logicalDate2 = isc.Date.getLogicalDateOnly(date1);
        } else {
            logicalDate1 = date2;
            logicalDate2 = date1;
        }
    }

    var jd1 = isc.Date.getJulianDayNumber(logicalDate1.getFullYear(), logicalDate1.getMonth(), logicalDate1.getDate()),
        jd2 = isc.Date.getJulianDayNumber(logicalDate2.getFullYear(), logicalDate2.getMonth(), logicalDate2.getDate());

    if (weekdaysOnly) {
        var dd = jd2 - jd1;
        var weekdayCounts = isc.Date._getWeekdayCounts();
        return sign * (parseInt(dd / 7) * (7 - weekdayCounts._numWeekends) + weekdayCounts[logicalDate1.getDay()][dd % 7]);
    } else {
        return sign * (jd2 - jd1);
    }
},

//>	@type DateInputFormat
//  3 character string containing the <code>"M"</code>, <code>"D"</code> and <code>"Y"</code>
//  characters to indicate the format of strings being parsed into Date instances via
//  <code>Date.parseInput()</code>.
//  <P>
//  As an example - an input format of "MDY" would parse "01/02/1999" to Jan 2nd 1999
// <smartclient>
//  <P>
//  Note: In addition to these standard formats, a custom date string parser function may be
//  passed directly to +link{Date.setInputFormat()} or passed into +link{Date.parseInput()} as
//  the inputFormat parameter.
// </smartclient>
//  @visibility external
//<

//> @classMethod Date.setInputFormat()
// Sets up the default system-wide input format for strings being parsed into dates via
// <code>Date.parseInput()</code>. This will effect how SmartClient components showing editable
// date or datetime fields parse user-entered values into live Date objects.
// <P>
// The input format can be specified as a +link{type:DateInputFormat} - a 3 character string like
// <code>"MDY"</code> indicating the order of the Month, Day and Year components of date strings.
// <P>
// As an example - an input format of "MDY" would parse "01/02/1999" to Jan 2nd 1999<br>
// This standard parsing logic will also handle date-time strings such as "01/02/1999 08:45", or
// "01/02/1999 16:21:05".
// <P>
// Notes:
// <ul>
// <li>If the inputFormat is not explicitly set,the system automatically determines
//     the standard input format will be based on the specified +link{Date.setShortDisplayFormat,Date.shortDisplayFormat}
//     wherever possible.
//     For example if the short display format has been set to "toEuropeanShortDate" the input
//     format will default to "DMY".</li>
// <li>The default date parsing functionality built into SmartClient will handle dates presented
//     with any separator string, and can handle 1 or 2 digit day and month values and 2 or 4
//     digit year values. This means that in many cases custom date display formats can be parsed
//     back to Date values without the need for a custom parser function. However if more
//     sophisticated parsing logic is required, a function may be passed into this method. In
//     this case the parser function should be able to handle parsing date and datetime values
//     formatted via +link{Date.toShortDate()} and +link{Date.toShortDateTime()}.</li>
// <li>Date parsing and formatting logic may be overridden at the component level by setting
//     properties directly on the component or field in question.</li>
// </ul>
// @param format (DateInputFormat | function) Default format for strings to be parsed into Dates.
// <smartclient>
// If this method is passed a function, it is expected to take a single parameter
// (the formatted date string), and return the appropriate Javascript Date object (or null if
// appropriate).
// </smartclient>
// @see Date.parseInput()
// @example dateFormat
// @example customDateFormat
// @visibility external
//<
setInputFormat : function (format) {
    
    this._inputFormat = format;
},

//> @classMethod Date.getInputFormat()
// Retrieves the default format for strings being parsed into dates via
// <code>Date.parseInput()</code>
// @see Date.setInputFormat()
// @return (string) the current inputFormat for dates
// @visibility external
//<
getInputFormat : function () {
    if (this._inputFormat != null) return this._inputFormat;
    return this.mapDisplayFormatToInputFormat("toShortDate");
},

// Given a display format return the associated input format
_inputFormatMap:{
    toUSShortDate:"MDY",
    toUSShortDateTime:"MDY",
    toUSShortDatetime:"MDY",
    toEuropeanShortDate:"DMY",
    toEuropeanShortDateTime:"DMY",
    toEuropeanShortDatetime:"DMY",
    toJapanShortDate:"YMD",
    toJapanShortDateTime:"YMD",
    toJapanShortDatetime:"YMD"
},
mapDisplayFormatToInputFormat : function (displayFormat) {
    if (displayFormat == null || displayFormat == "toShortDate") {
        displayFormat = Date.prototype._shortFormat;
    } else if (displayFormat == "toNormalDate") {
        displayFormat = Date.prototype.formatter;
    }
    if (isc.isA.Function(displayFormat)) {
        isc.Log.logInfo("Unable to determine input format associated with display format " +
                        "function - returning default input format", "Date");
        return this._inputFormat || "MDY";
    }
    var inputFormat = this._inputFormatMap[displayFormat];
    // Note: isA.String check is necessary - all objects have toString / toLocaleString
    // present on them and we definitely don't want to return those native object formatters
    // as what will become a dateString parsing function!
    if (inputFormat != null && isc.isA.String(inputFormat)) return inputFormat;

    // a couple of special cases where we actually return functions.
    if (displayFormat == "toSerializeableDate") return this.parseSchemaDate;

    // Otherwise you're on your own - assume you've set up input foramt, or overridden this method
    isc.Log.logInfo("Unable to determine input format associated with display format " +
                     displayFormat + " - returning default input format", "Date");

    return this._inputFormat || "MDY";
},

//>	@classMethod	Date.parseInput()
// Parse a date passed in as a string, returning the appropriate date object.
// @param dateString (string) date value as a string
// @param [format] (DateInputFormat) Format of the date string being passed.
//                                      If not passed, the default date input format as set up
//                                      via setInputFormat() will be used.
// @param [centuryThreshold] (integer) For date formats that support a 2 digit
//                                  year, if parsed year is 2 digits and less than this
//                                  number, assume year to be 20xx rather than 19xx
// @param [suppressConversion] (Boolean)
//          If the string passed in was not a valid date, in some cases we can convert to a
//          valid date (for example incrementing the year if the month is greater than 12).
//          This optional parameter will suppress such conversions - anything that doesn't
//          parse directly to a valid date will simply return null.
// @return (Date) date value, or null if the string could not be parsed to a valid date.
// @group dateFormatting
// @visibility external
//<

// Note: undocumented isDatetime parameter. Are we creating a logical "date" value or a standard
// datetime type value where the time component is important? If ommitted assume datetime.
// Implementation-wise, if isDatetime is explicitly false, we will use the system local timezone
// rather than any timezone specified via Time.setDisplayTimezone().

parseInput : function (dateString, format, centuryThreshold, suppressConversion,
                        isDatetime)
{
    var logicalDate = (isDatetime == false);

    if (isc.isA.Date(dateString)) return dateString;

    if (!isc.isA.String(dateString) || isc.isAn.emptyString(dateString)) {
        return null;
    }

    // Strip the '$$DATE$$:' prefix if present.
    var origDateString = dateString;
    dateString = dateString.trim();
    
    if (dateString.startsWith("$$DATESTAMP$$:")) {
        return new Date(parseInt(dateString.substring(14)));
    }
    
    if (dateString.startsWith("$$DATE$$:")) {
        dateString = dateString.substring(9).trimLeft();
    }

    // Default to the standard input format
    if (format == null) format = this.getInputFormat();

    // If the format passed in is the name of a function on the Date class, or an
    // explicit function, assume its a parser and call it directly
    
    if (isc.isA.Function(Date[format])) format = Date[format];
    if (isc.isA.Function(format)) {
        return format(origDateString, centuryThreshold, suppressConversion);
    }

    // use the helper method _splitDateString() to get an array of values back
    // (representing year / month / day, etc.)
    // If null is returned, this was not a valid date - just return null.
    // Otherwise make the month zero-based, by reducing by one, and pass construct a new date
    // from the values returned.
    var array = this._splitDateString(dateString, format);

    if (array != null) {
        var year = array[0],
            bce = year && year.contains("-");

        if (year && bce) year = year.replaceAll("-", "");

        if (year) {
            if (year.length <= 2) {
                year = parseInt(year, 10);
                if (centuryThreshold != null) {
                    if (year < centuryThreshold) year += 2000;
                    else year += 1900;
                }
                array[0] = year;
            } else if (year.length == 3) {
                array[0] = "0" + year.toString();
            } else {
                array[0] = year;
            }
            if (bce) array[0] = "-" + array[0];
        }

        if (logicalDate) {
            return Date.createLogicalDate(array[0], array[1], array[2], suppressConversion);
        } else {
            return Date.createDatetime(array[0], array[1], array[2],
                        array[3], array[4], array[5], null, suppressConversion);
        }
    } else {
        return null;
    }
},

// Helper used by the Relative date item -- returns true if the date-string passed
// in includes a time portion.
// False if it does not (or if it's not a recognized date-string at all)
isDatetimeString : function (dateString, format) {
    format = format || isc.Date.getInputFormat();
    if (!isc.isA.Function(format)) {
        var array = this._splitDateString(dateString, format, false);
        if (array == null) return false;

        return (array[3] != null && !isc.isA.emptyString(array[3])) && 
               (array[4] != null && !isc.isA.emptyString(array[4]));
    }

    
    if (!dateString.contains(" ")) return false;
    // get the offset of the last colon and assume there's a valid time portion if the characters
    // either side of it are numbers
    var colonOffset = dateString.lastIndexOf(":");
    if (colonOffset < 1) return false;
    if (isNaN(dateString.substring(colonOffset-1, colonOffset)) ||
        isNaN(dateString.substring(colonOffset+1, colonOffset+2)))
    {
        return false;
    }
    return true;
},

// Parse a date or datetime value from a dataset or specified in code.
// NB: unlike parseInput, this method should not change behavior in different locales, or dates
// coming over the wire or specified in code will suddenly break!
//
// For Datetime, XML Schema uses "2005-08-01T21:35:48.350Z", see
//    http://www.w3.org/TR/xmlschema-2/#dateTime
// SmartClient Server parses "yyyy-mm-dd" format
parseSchemaDate : function (value) {
    if (isc.isA.Date(value)) return value;

    if (!isc.isA.String(value)) value = (value.toString ? value.toString() : value + "");

    // Notes on regex:
    // - date-elements should be separated by "-", but we also support "/" because this method
    //   is also used when receiving REST responses from the server (by the isDate validator), 
    //   to convert the on-the-wire string format for dates into actual Date instances.
    // - result[4] is the optional timestamp including the T and colon separators
    // - result[8] would be the optional milliseconds including the ".", whereas
    //   result[9] is just the numeric part
    //   results[10] is the timezone - either "Z" (zulu time or GMT) or +/- HH:MM
    var result = value.match(/(\d{4})[\/-](\d{2})[\/-](\d{2})([T ](\d{2}):(\d{2})(:(\d{2}))?)?(\.(\d+))?([+-]\d\d?:\d{2}|Z)?/);
//    isc.Log.logWarn("isDate: '" + value + "', regex match: " + result);

    var secondsIndex = 8;
    var msIndex = 10;
    var tzIndex = 11;

    if (result == null) return null;
    
    value = value.trim();

    
    var dateValue;
    // NOTE: pass only the relevant arguments as Moz does not like being passed nulls
    
    if (!result[4]) { // no VALID time
        // before creating a logical date, check if the value has additional characters that
        // make it look like it has something in place of a time-value, even if it isn't 
        // valid for schema-format - return null in this case, rather than a valid logicalDate
        if (value.length > 10 && value.contains(" ")) return null;
        // result[2] should contain the month, but if this value is greater than 12 (twelve month),
        // then result[3] should be the month and result[2] should be the day of the month.
        if (result[2] > 12) {
            var month = result[3];
            result[3] = result[2];
            result[2] = month;
        }
        dateValue = Date.createLogicalDate(result[1], result[2] - 1, result[3]);
    } else if (!result[msIndex]) { // no ms
        dateValue = new Date(Date.UTC(result[1], result[2] - 1, result[3],
                                      result[5], result[6], result[secondsIndex] || 0));
    } else {
        var ms = result[msIndex];

        // XML Schema says any number of fractional digits can be specified.  new Date() is
        // expecting a whole number of milliseconds (and further precision would be ignored).
        // Multiply by a power of ten based on the number of digits provided, such that ".9"
        // becomes 900 and ".98367" becomes 984.
        if (ms.length != 3) {
            var multiplier = Math.pow(10,3-ms.length);
            ms = Math.round(parseInt(ms,10) * multiplier);
        }
        //isc.Log.logWarn("ms is: " + ms);

        dateValue = new Date(Date.UTC(result[1], result[2] - 1, result[3],
                                      result[5], result[6], result[secondsIndex] || 0, ms));
    }
    // Handle timezone offset from GMT

    if (result[tzIndex] && result[tzIndex].toLowerCase() != "z") {
        var HM = result[tzIndex].split(":"),
            H = HM[0],
            negative = H && H.startsWith("-"),
            M = HM[1];
        H = parseInt(H, 10);
        M = parseInt(M, 10);
        var dateTime = dateValue.getTime();

        
        // Note no need to account for negative on hours since the "+" or "-" prefix was picked up
        // in parseInt
        if (isc.isA.Number(H)) dateTime -= (3600000 * H);
        if (isc.isA.Number(M)) dateTime -= (60000 * M * (negative ? -1 : 1));
        dateValue.setTime(dateTime);
    }

    return dateValue
},

//>!BackCompat 2005.11.3
// parseDate() was old name for parseInput
parseDate : function (dateString, format, centuryThreshold, suppressConversion) {
    return this.parseInput(dateString, format, centuryThreshold, suppressConversion);
},

// For completeness also support parseDatetime()
parseDateTime : function (dateString, format, centuryThreshold, suppressConversion) {
    return this.parseDatetime(dateString,format,centuryThreshold,suppressConversion);
},
parseDatetime : function (dateString, format, centuryThreshold, suppressConversion) {
    return this.parseInput(dateString, format, centuryThreshold, suppressConversion);
},
//<!BackCompat

// ISC DSResponses that use our SQLTransform logic (basically our backend DB implementation)
// will call this method by default - giving the user an opportunity to override.  This can be
// disabled by setting jsTranslater.writeNativeDate: true in server.properties.
//
// Note: month is zero-based, just like the native Date constructor.
parseServerDate : function (year, month, day) {
    return Date.createLogicalDate(year, month, day);
},

// ISC DSResponses will call this method by default for fields of type "time"
parseServerTime : function (hour, minute, second) {
    return Date.createLogicalTime(hour, minute, second);
},


_splitDateString : function (string, format, zeroEmptyTime) {
    var isFunc = isc.isA.Function(format);

    if (zeroEmptyTime == null) zeroEmptyTime = true;

    var month, day, year, hour, minute, second;

    var monthIndex = format && !isFunc ? format.indexOf("M") : 0,
        dayIndex = format && !isFunc ? format.indexOf("D") : 1,
        yearIndex = format && !isFunc ? format.indexOf("Y") : 2; 
    // shortDate implies it's of the format MM/DD/YYYY
    
    //>Safari12
    if (isc.Browser.isSafari && isc.Browser.safariVersion <= 312) {
        var splitDate = this._splitDateViaSubstring(string, monthIndex, dayIndex, yearIndex,
                                                    zeroEmptyTime);
        year = splitDate[0];
        month = splitDate[1];
        day = splitDate[2];
        hour = splitDate[3];
        minute = splitDate[4];
        second = splitDate[5];

    // For browsers that support RegExp properly, use regexp pattern matching to get the result
    // (This has the advantage that we can deal with dates of the form 1/1/1999, and attempt to
    //  convert MM/YY/DD -- though we're relying on the native browser handling for the
    //  Date constructor being passed a 2 digit year)
    } else {
    //<Safari12

        // Each of the first three slots is either YYYY / YY or MM / M (or DD/D) (depends on the
        // format passed in)
        // Note: We don't support years greater than 9999. Attempting to set a year greater than
        // 9999 on a JS date causes a native browser crash on IE6
        var regex =
        //          YYYY || YY/[M]M  /  YYYY || YY/[M]M  /  YYYY || YY/[M]M [(space) [H]H  :    MM    [:     SS]]
        new RegExp(/^\s*(-?\d{1,4})[^\d](-?\d{1,4})[^\d](-?\d{1,4})([^\d](\d{1,2})[^\d](\d\d)[^\d]?(\d\d)?)?\s*([ap]m?)?\s*$/),
            results = string.match(regex);

            if (results == null) return null;
        // Notes - we need to match the order of day / month / year to the format passed in
        // Also - the month value in the string is 1-based rather than zero based

        // Note: this was parseInt(results[index]) -1, but both IE and Mozilla will do the
        // wrong thing here - if the substring was "09", the parseInt would return 0 rather
        // than 9.
        // In any case, the parseInt is rendered unnecessary by the 'isA.Number' check below.
        month = results[monthIndex +1] -1;
        day = results[dayIndex+1];
        year = results[yearIndex +1];

        // Note - results[4] is the whole time string (if present)
        // Zero out any time fields that are not present - this may happen if
        // - time has invalid format (could check by examining results[4] too)
        // - time not included in dateString (could check by examining results[4] too)
        // - time has no seconds (legal - just zero out the seconds)
        hour = results[5];
        if (zeroEmptyTime && hour == null) hour = 0;
        minute = results[6];
        if (zeroEmptyTime && results[6] == null) minute = 0;
        second = results[7];
        if (zeroEmptyTime && results[7] == null) second = 0;
        
        if (results[8]) {
            // support am/pm markers (a/p/am/pm, case insensitive)
            hour = parseInt(hour);
            if (results[8].toLowerCase().startsWith("a")) {
                if (hour == 12) hour = 0;
            } else {
                if (hour < 12) hour += 12;
            }
        }
    //>Safari12
    }
    //<Safari12
    // If they all are numbers, this was a valid date string
    // NOTE: If year - month - day gives a number then they
    // are all numbers, or strings that implicitly convert to numbers.
    // We could also use this syntax:
    // if(parseInt(year) == year && parseInt(month) == month ...)
    // but this is slower in both Moz and IE
    var isValid = zeroEmptyTime ? 
                    isc.isA.Number(year - month - day - hour - minute - second) :
                    isc.isA.Number(year - month - day);
    if (isValid) {
        // Return the hours modulo 24 in case the hours were formatted by a Java `SimpleDateFormat'
        // using the 'k' pattern char. This takes care of both 'H' and 'k'.
        // http://ideone.com/E5HC4E
        
        return ([year,month,day,hour != null ? hour % 24 : null ,minute,second]);
    }
    else return null
},

//>	@type DateDisplayFormat
// Valid display formats for dates.  These strings are the names of formatters which can be
// passed to <code>Date.setNormalDisplayFormat()</code> or <code>Date.setShortDisplayFormat()</code>
// and will be subsequently used as default long or short formatters for date objects by
// SmartClient components.<br>
// Default set of valid display formats is as follows:<br><br>
//
// @value toString
// Default native browser 'toString()' implementation. May vary by browser.<br>
// <i>Example</i>: <code>Fri Nov 04 2005 11:03:00 GMT-0800 (Pacific Standard Time)</code>
// @value toLocaleString
// Default native browser 'toLocaleString()' implementation. May vary by browser.
// <i>Example</i>: <code>Friday, November 04, 2005 11:03:00 AM</code>
// @value toUSShortDate Short date in format MM/DD/YYYY.<br>
// <i>Example</i>: <code>11/4/2005</code>
// @value toUSShortDatetime Short date with time in format MM/DD/YYYY HH:MM<br>
// <i>Example</i>: <code>11/4/2005 11:03</code>
// @value toEuropeanShortDate Short date in format DD/MM/YYYY.<br>
// <i>Example</i>: <code>4/11/2005</code>
// @value toEuropeanShortDatetime Short date with time in format DD/MM/YYYY HH:MM<br>
// <i>Example</i>: <code>4/11/2005 11:03</code>
// @value toJapanShortDate Short date in format YYYY/MM/DD.<br>
// <i>Example</i>: <code>2005/11/4</code>
// @value toJapanShortDatetime Short date with time in format YYYY/MM/DD HH:MM<br>
// <i>Example</i>: <code>2005/11/4 11:03</code>
// @value toSerializeableDate Date in the format YYYY-MM-DD HH:MM:SS<br>
// <i>Example</i>: <code>2005-11-04 11:09:15</code>
// @value toDateStamp   Date in the format &lt;YYYYMMDD&gt;T&lt;HHMMSS&gt;Z
// <i>Example</i>: <code>20051104T111001Z</code>
// <br>
// <br>
// Note: In addition to these standard formats, custom formatting can be set by passing
// a function directly to +link{Date.setNormalDisplayFormat()} et al. This
// function will then be executed whenever the appropriate formatter method is called [eg
// +link{date.toNormalDate()}], in the scope of the date instance in question.
// <p>
// Custom formatting can also be applied by passing a +link{FormatString} instead of a 
// <code>DateDisplayFormat</code> string to +link{Date.setNormalDisplayFormat()} et al. See
// the <code>FormatString</code> docs for details.
//
//  @visibility external
//<

//> @classMethod Date.setNormalDisplayFormat()
// Set the default formatter for date objects to the method name passed in.  After calling this
// method, subsequent calls to +link{Date.toNormalDate()} will return a string formatted
// according to this format specification. Note: this will be the standard long date format used
// by SmartClient components.
// <p>
// The <code>format</code> parameter may be a +link{FormatString}, a +link{DateDisplayFormat} 
// string, or a function. If passed a function, this function will be executed in the scope of
// the Date and should return the formatted string.<br>
// <p>
// Initial default normalDisplayFormat is <code>"toLocaleString"</code>
// @group	dateFormatting
// @param	format	(FormatString | DateDisplayFormat | function)	new formatter
//      @visibility external
//<
setNormalDisplayFormat : function (format) {
    // if a valid formatter was passed in, set our .formatter property
	if (isc.isA.Function(Date.prototype[format]) || 
        isc.isA.Function(format) || 
        isc.isA.String(format)) 
    {
	    Date.prototype.formatter = format;
    }
},

setNormalDateDisplayFormat : function (format) {
    this.setNormalDisplayFormat(format);
},

//> @classMethod Date.setNormalDatetimeDisplayFormat()
//  Set the default normal format for datetime values. After calling this method, subsequent calls to
// +link{Date.toNormalDatetime()} will return a string formatted according to this format
// specification. Note that this will be the standard datetime format used by
// SmartClient components.
// <P>
// The <code>format</code> parameter may be a +link{FormatString}, a +link{DateDisplayFormat} 
// string, or a function. If passed a function, this function will be executed in the scope of
// the Date and should return the formatted string.<br>
//
// @group	dateFormatting
// @param	format	(FormatString | DateDisplayFormat | function)	new formatter
// @example dateFormat
// @example customDateFormat
// @visibility external
//<
setNormalDatetimeDisplayFormat : function (format) {
    // if a valid formatter was passed in, set our .datetimeFormatter property
	if (isc.isA.Function(Date.prototype[format]) || 
        isc.isA.Function(format) || 
        isc.isA.String(format)) 
    {
	    Date.prototype.datetimeFormatter = format;
    }
},

//>	@classMethod	Date.setShortDisplayFormat()
// Set the default short format for dates. After calling this method, subsequent calls to
// +link{Date.toShortDate()} will return a string formatted according to this format
// specification. Note that this will be the standard short date format used by
// SmartClient components.
// <P>
// The <code>format</code> parameter may be a +link{FormatString}, a +link{DateDisplayFormat} 
// string, or a function. If passed a function, this function will be executed in the scope of
// the Date and should return the formatted string.<br>
// <P>
// Initial default shortDateFormat is <code>"toUSShortDate"</code>. This property
// is commonly modified for localization of applications. See
// +externalLink{http://en.wikipedia.org/wiki/Date_format_by_country}
// for a useful overview of standard date formats per country.
//
// @group	dateFormatting
// @param	format	(FormatString | DateDisplayFormat | function)	new formatter
// @example dateFormat
// @example customDateFormat
// @visibility external
//<
setShortDisplayFormat : function (format) {
	if (isc.isA.Function(Date.prototype[format]) || 
        isc.isA.Function(format) || 
        isc.isA.String(format)) 
    {
        Date.prototype._shortFormat = format;
    }
},

//>	@classMethod Date.setDefaultDateSeparator
// Sets a new default separator that will be used when formatting dates. By default, this
// is a forward slash character: "/"
// @group   dateFormatting
// @param separator (string) separator to use in dates
// @visibility external
//<
setDefaultDateSeparator : function (separator) {
    Date.prototype._shortDateTemplate = [,,,,separator,,,,,separator,,,,null];
    Date.prototype._separator = separator;
},

//>	@classMethod Date.getDefaultDateSeparator
// gets the default date separator string
// @group   dateFormatting
// @return (string) the default date separator
// @visibility external
//<
getDefaultDateSeparator : function (separator) {
    if (Date.prototype._separator) return Date.prototype._separator;
    else return "/";
},

//> @classMethod Date.setShortDatetimeDisplayFormat()
//  Set the default short format for datetime values. After calling this method, subsequent calls to
// +link{Date.toShortDateTime()} will return a string formatted according to this format
// specification. Note that this will be the standard datetime format used by
// SmartClient components.
// <P>
// The <code>format</code> parameter may be a +link{FormatString}, a +link{DateDisplayFormat} 
// string, or a function. If passed a function, this function will be executed in the scope of
// the Date and should return the formatted string.<br>
// <P>
// Initial default format is <code>"toUSShortDatetime"</code>.  See
// +externalLink{http://en.wikipedia.org/wiki/Date_format_by_country}
// for a useful overview of standard date formats per country.
//
// @group	dateFormatting
// @param	format	(FormatString | DateDisplayFormat | function)	new formatter
// @example dateFormat
// @example customDateFormat
// @visibility external
//<
setShortDatetimeDisplayFormat : function (format) {
	if (isc.isA.Function(Date.prototype[format]) || 
        isc.isA.Function(format) || 
        isc.isA.String(format)) 
    {
        Date.prototype._shortDatetimeFormat = format;
    }
},


//> @object FiscalYear
//
// An object representing the start of a given Fiscal Year in the current locale.
// <P>
// See +link{FiscalCalendar} for more information on how FiscalYears are set up and used.
//
// @treeLocation Client Reference/System/Date
// @visibility external
//<

//> @attr fiscalYear.fiscalYear (integer : null : IRW)
//
// The actual fiscal year that this date relates to.
// <P>
// A fiscal year ends when the next one begins. A fiscal year may span the boundary
// between two calendar years in which case the +link{fiscalYear.fiscalYear} value may
// not match the +link{fiscalYear.year} value.
// <P>
// For example fiscalYear 2020 may start in July of 2019 and end in July of 2020. In this
// case the <code>fiscalYear</code> would be set to <code>2020</code> and the
// +link{fiscalYear.year} would be set to <code>2019</code>
//
// @visibility external
//<

//> @attr fiscalYear.year (integer : null : IRW)
//
// The 4-digit calendar year when this fiscal year starts.
//
// @visibility external
//<

//> @attr fiscalYear.month (integer : null : IRW)
//
// The zero-based month-number when this fiscal year starts.
//
// @visibility external
//<

//> @attr fiscalYear.date (integer : null : IRW)
//
// The one-based day-number in the +link{fiscalYear.month, specified month} when this fiscal
// year starts.
//
// @visibility external
//<

//> @object FiscalCalendar
//
// An object representing the start date for fiscal years in the current locale.
// <P>
// A fiscal year spans a configurable date range - it may not exactly
// match a calendar year in length and it can start on any date within the calendar year
// and potentially end in the next calendar year.
// <P>
// Developers may specify explicit fiscal year start dates by adding +link{FiscalYear}
// objects to the +link{FiscalCalendar.fiscalYears, fiscal years array}.
// If none are provided, or if there is no entry for the given year, one is
// manufactured based on the default +link{FiscalCalendar.defaultMonth, month}
// and +link{FiscalCalendar.defaultDate, date}.
//
// @treeLocation Client Reference/System/Date
// @visibility external
//<

//> @attr fiscalCalendar.defaultMonth (integer : null : IRW)
//
// The default zero-based month-number to use for calculating fiscal dates when no
// +link{FiscalCalendar.fiscalYears, fiscal years} are provided. This value together
// with +link{fiscalCalendar.defaultDate} will be used as the start date for the
// fiscal years where no explicitly specified fiscalYear configuration is present.
// <br>
// See also +link{fiscalCalendar.defaultYearMode}.
//
// @visibility external
//<

//> @attr fiscalCalendar.defaultDate (integer : null : IRW)
//
// The default one-based day-number in the +link{fiscalCalendar.defaultMonth, specified month}
// to use for calculating fiscal dates when no +link{FiscalCalendar.fiscalYears, fiscal years}
// are provided. This value together
// with +link{fiscalCalendar.defaultMonth} will be used as the start date for the
// fiscal years where no explicitly specified fiscalYear configuration is present.
// <br>
// See also +link{fiscalCalendar.defaultYearMode}.
//
// @visibility external
//<

//> @type FiscalYearMode
//
// Strategies for calculating the FiscalYear within a +link{fiscalCalendar} from the
// specified +link{fiscalCalendar.defaultDate} and +link{fiscalCalendar.defaultMonth}
// If the specified fiscal year date starts in one calendar year and ends in the next.
//
// @value "end" The fiscalYear value for the date range will match the calendar year
//  in which the period ends. For example if the defaultDate and defaultMonth were set
//  to represent April 1st, the fiscal year starting on April 1st 2020 would end on
//  April 1st 2021. Setting the fiscalYearMode to <code>end</code> would mean the
//  fiscalYear value for this block would be 2021.
//
// @value "start" The fiscalYear value for the date range will match the calendar year
//  in which the period starts. For example if the defaultDate and defaultMonth were set
//  to represent April 1st, the fiscal year starting on April 1st 2020 would end on
//  April 1st 2021. Setting the fiscalYearMode to <code>start</code> would mean the
//  fiscalYear value for this block would be 2020.
// @visibility external
//<

//> @attr fiscalCalendar.defaultYearMode (FiscalYearMode : "end" : IRW)
//
// This attribute controls how the displayed fiscalYear value should be calculated for
// dates falling within a period not explicitly listed in the
// +lik{fiscalCalendar.fiscalYears,fiscal years array}.
// <P>
// The +link{fiscalCalendar.defaultMonth} and +link{fiscalCalendar.defaultDate} will be
// used to calculate the start of the fiscal year period. The defaultYearMode
// determines whether the reported fiscalYear for this period matches the year in which
// the period starts or the year in which it ends (so whether a fiscal year spanning
// dates within both 2020 and 2021 is reported as fiscalYear 2020 or 2021).
// @visibility external
//<

//> @attr fiscalCalendar.fiscalYears (Array of FiscalYear : null : IRW)
//
// An array of +link{FiscalYear, FiscalYear objects} which each represent the start date of a
// single fiscal year.
//
// @visibility external
//<

//>	@classMethod date.setFiscalCalendar()
// Sets the global fiscal calendar, which is used for all calls to
// getFiscalYear() / getFiscalWeek() if those methods aren't passed a fiscalCalander.
//
// @param fiscalCalendar (FiscalCalendar) the object representing the start month and date of
//           the fiscal year in the current locale
// @visibility external
//<
setFiscalCalendar : function (fiscalCalendar) {
    if (!fiscalCalendar.fiscalYears) fiscalCalendar.fiscalYears = [];
    Date.prototype.fiscalCalendar = fiscalCalendar;
    // init the start/endDate values on any specified FiscalYear objects
    Date._getFiscalYearObjectForDate(new Date());
},

//>	@classMethod date.getFiscalCalendar()
// Returns the global +link{FiscalCalendar, FiscalCalendar object} representing the start month and
// date of the fiscal year in the current locale.
// @return (FiscalCalendar)	the FiscalCalendar object
// @visibility external
//<
getFiscalCalendar : function () {
    if (!Date.prototype.fiscalCalendar.fiscalYears) {
        Date.prototype.fiscalCalendar.fiscalYears = [];
    }
    return Date.prototype.fiscalCalendar;
},

//>	@classMethod date.getFiscalStartDate()
// Returns the start date of the fiscal year for the passed date.
//
// @param date (Date | number) the date, or the year-number, to get the fiscal year for
// @param [fiscalCalendar] (FiscalCalendar) the object representing the starts of one or more
//                              fiscal years
// @return (Date)	the start of the fiscal year for the passed date and fiscalCalendar
// @visibility external
//<
getFiscalStartDate : function (date, fiscalCalendar) {
    var fiscalYear = Date._getFiscalYearObjectForDate(date, fiscalCalendar);
    return new Date(fiscalYear.year, fiscalYear.month, fiscalYear.date);
},


getFiscalEndDate : function (date, fiscalCalendar) {
    var fy = Date._getFiscalYearObjectForDate(date, fiscalCalendar),
        nfy = Date.getFiscalYear(fy.fiscalYear + 1);
    if (nfy.year < fy.fiscalYear) nfy = Date.getFiscalYear(nfy.fiscalYear + 1);
    var endDate = new Date(nfy.startDate.getTime()-1);
    return endDate;
},


_getFiscalYearObjectForDate : function (date, fiscalCalendar) {

    fiscalCalendar = fiscalCalendar || Date.getFiscalCalendar();
    if (!fiscalCalendar.fiscalYears) fiscalCalendar.fiscalYears = [];

    var fiscalYears = fiscalCalendar.fiscalYears;

    var defaultStartDate = fiscalCalendar.defaultDate,
        defaultStartMonth = fiscalCalendar.defaultMonth;
    // If unspecified default to calendar years.
    if (defaultStartDate == null) defaultStartDate = 1;
    if (defaultStartMonth == null) defaultStartMonth = 0;

    // In order to rapidly find the fiscalYearObject associated with some date,
    // do a one-time calculation of the start and endDates of each specified fiscal year
    // and store them on the objects.
    
    var initialized = true;
    for (var i = 0; i < fiscalYears.length; i++) {
        if (fiscalYears[i].startDate == null || fiscalYears[i].endDate == null) {
            initialized = false;

            fiscalYears[i].startDate = Date.createDatetime(
                                        fiscalYears[i].year,
                                        fiscalYears[i].month,
                                        fiscalYears[i].date
                                       );
       }
    }
    fiscalYears.setSort({property: "startDate", direction: "ascending" });
    if (!initialized) {
        for (var i = 0; i < fiscalYears.length; i++) {
            var endDate;

            var fy = fiscalYears[i],
                nextFY = fiscalYears[i+1];
            // If the next entry in the fiscalYears array starts in the following year
            // (or later in the same year), consider that the end date for this FY.
            // Otherwise use the defaultDate/defaultMonth of the next year.
            // This allows the specified fiscalYears array to be sparse
            // (For example custom behavior could be specified for 2000 and 2010 only, and
            // every year in between will use the default month/date start)
            if (nextFY && (nextFY.year == fy.year || (nextFY.year == fy.year+1))) {
                fy.endDate = new Date(nextFY.startDate.getTime()-1);
            } else {

                fy.endDate = Date.createDatetime(
                                fy.year+1, defaultStartMonth, defaultStartDate);
                // reduce by 1ms so it's the end of the prev day
                // This will avoid confusion with whether it rolls over a year
                // if the date is actually jan 1st
                fy.endDate.setTime(fy.endDate.getTime()-1);
            }
        }
    }


    // If we're passed just a year value, return the fiscalYear definition where
    // 'fiscalYear' is set to the specified date (may have to be created)
    if (!isc.isA.Date(date)) {

        var fiscalYearObj = fiscalYears.find("fiscalYear", date);
        if (fiscalYearObj != null) {
             return fiscalYearObj;
        }

        // We know we need to create a new fiscalYear object who's fiscalYear
        // property will be set to the specified date value.
        var calendarYear = date;
        if (fiscalCalendar.defaultYearMode != "start" &&
            (defaultStartMonth != 0 || defaultStartDate != 1))
        {
            calendarYear -= 1;
        }
        // Build a default object and return it.
        
        var result = {
            year:calendarYear,
            fiscalYear:date,
            month:defaultStartMonth,
            date:defaultStartDate,
            startDate: isc.DateUtil.getStartOf(new Date(calendarYear, defaultStartMonth, defaultStartDate))
        };
        return result;

    } else {
        var date_timestamp = date.getTime();
        // Array should already be sorted - re-sort just in case it was missed.
        fiscalYears.sortByProperty("startDate", Array.ASCENDING);
        for (var i = 0; i < fiscalYears.length; i++) {
            if (date_timestamp < fiscalYears[i].startDate.getTime()) break;
            if (date_timestamp <= fiscalYears[i].endDate.getTime()) {
                // date falls between start and end of the specified fiscal year so use it.
                return fiscalYears[i];
            }
        }

        // At this point we know we didn't have an entry in the fiscal years array
        // for this date, so create one based on the default start date
        var dateYear = date.getFullYear(),
            startDate = Date.createDatetime(dateYear,
                                          defaultStartMonth,
                                          defaultStartDate);
        // Date falls before default start date, shift back a year.
        if (startDate.getTime() > date_timestamp) {
            dateYear -= 1;
            startDate = Date.createDatetime(dateYear,
                                          defaultStartMonth,
                                          defaultStartDate);
        }

        // Calculate the endDate - the year it falls in will determine the reported
        // 'fiscalYear'.
        var endDate = Date.createDatetime(dateYear+1,
                                          defaultStartMonth,
                                          defaultStartDate);
        // Shunt back to the end of the prev day.
        endDate.setTime(endDate.getTime()-1);

        // If there's a specified fiscalYear in our array that starts before the
        // calculated endDate, truncate this year a little earlier to account for it.
        var endDate_timestamp = endDate.getTime();
        for (var i = 0; i < fiscalYears.length; i++) {

            if (endDate_timestamp < fiscalYears[i].endDate.getTime()) {
                continue;
            } else {
                if (endDate_timestamp > fiscalYears[i].startDate.getTime()) {
                    endDate = new Date(fiscalYears[i].startDate.getTime()-1);
                } else break;
            }
        }

        var fiscalYear = dateYear;
        // If we span 2 calendar years and the year mode is set to "end",
        // (or unset - since this is default behavior), increment the fiscal year to
        // match the end date.
        if (endDate.getFullYear() != startDate.getFullYear()
             && fiscalCalendar.defaultYearMode != "start")
        {
            if (endDate.getFullYear() < date.getFullYear()) {
                fiscalYear = date.getFullYear();

                var tempStart = new Date(fiscalYear, defaultStartMonth, defaultStartDate);
                if (date.getTime() > tempStart.getTime()) {
                    fiscalYear++;
                }
            } else {
                fiscalYear = endDate.getFullYear();
            }
        }

        return {
            year:dateYear,
            fiscalYear:fiscalYear,
            date:defaultStartDate,
            month:defaultStartMonth
        };

    }
},

//>	@classMethod date.setShowChooserFiscalYearPickers()
// Sets the global attribute that dictates whether the +link{DateChooser, choosers} shelled
// from +link{DateItem, DateItems} show a UI for working with Fiscal Years.
//
// @param showChooserFiscalYearPickers (boolean) whether to show Fiscal Year pickers in DateChoosers by default
// @visibility external
//<
setShowChooserFiscalYearPickers : function (showChooserFiscalYearPickers) {
    isc.DateItem.addProperties({
        showChooserFiscalYearPicker: showChooserFiscalYearPickers
    });
    isc.DateChooser.addProperties({
        showFiscalYearChooser: showChooserFiscalYearPickers
    });
},

//>	@classMethod date.setShowChooserWeekPickers()
// Sets the global attribute that dictates whether the +link{DateChooser, choosers} shelled
// from +link{DateItem, DateItems} show a UI for working with Weeks.
//
// @param showChooserWeekPickers (boolean) whether to show Fiscal Week pickers in DateChoosers by default
// @visibility external
//<
setShowChooserWeekPickers : function (showChooserWeekPickers) {
    isc.DateItem.addProperties({
        showChooserWeekPicker: showChooserWeekPickers
    });
    isc.DateChooser.addProperties({
        showWeekChooser: showChooserWeekPickers
    });
},


//>	@classMethod date.setFirstDayOfWeek()
// Sets the global attribute that dictates which day should be treated as the first day of the
// week in calendars and date calculations.  The parameter is expected to be an integer value 
// between 0 (Sunday) and 6 (Saturday).
// <P>
// The default value is picked up from the current locale.
//
// @param firstDayOfWeek (int) the number of the day to use as the first day of the week
// @visibility external
//<
setFirstDayOfWeek : function (firstDayOfWeek) {
    if (isc.DateChooser) {
        if (firstDayOfWeek == null || firstDayOfWeek < 0 || firstDayOfWeek > 6) 
            firstDayOfWeek = 0;
        isc.DateChooser.addProperties({firstDayOfWeek: firstDayOfWeek});
    }
},

//>	@classMethod date.getFirstDayOfWeek()
// Returns the global attribute that dictates which day should be treated as the first day of 
// the week in calendars and date calculations.  The parameter is expected to be an integer 
// value between 0 (Sunday) and 6 (Saturday).
// <P>
// The default value is picked up from the current locale.
//
// @return (int) the number of the day being used as the first day of the week
// @visibility external
//<
getFirstDayOfWeek : function () {
    if (isc.DateChooser) {
        return isc.DateChooser.getInstanceProperty("firstDayOfWeek");
    }
    return 0;
},



//>	@classMethod date.getFiscalYear()
// Returns the +link{FiscalYear} object for the fiscal year in which the passed date exists.
//
// @param date (Date | int) the date to get the fiscal year for
// @param [fiscalCalendar] (FiscalCalendar) the object representing the start of the fiscal period
// @return (FiscalYear) the +link{FiscalYear} object for the passed date
// @visibility external
//<
getFiscalYear : function (date, fiscalCalendar) {
    return Date._getFiscalYearObjectForDate(date, fiscalCalendar);
},

//>	@classMethod date.getFiscalWeek()
// Returns a date's week-number, according to the fiscal calendar
//
// @param date (Date) the date to get the fiscal year for
// @param [fiscalCalendar] (FiscalCalendar) the object representing the starts of fiscal years
// @return (int) the fiscal week for the passed date
// @visibility external
//<
_millisInADay: (1000 * 60 * 60 * 24),
getFiscalWeek : function (date, fiscalCalendar, firstDayOfWeek) {
    fiscalCalendar = fiscalCalendar || Date.getFiscalCalendar();

    var yearStart = Date.getFiscalStartDate(date, fiscalCalendar),
        logicalYearStart = Date.getLogicalDateOnly(yearStart),
        logicalDate = date.logicalDate ? date : Date.getLogicalDateOnly(date);
    return this._getWeekOffset(logicalDate, logicalYearStart, firstDayOfWeek);
},

// Used by getWeek() / getFiscalWeek()
_stackCount:0,
_getWeekOffset : function (date, startDate, firstDayOfWeek) {
    
    var dayDiff = Math.round((date - startDate)/86400000);

    // firstDayOfWeek - used for calendar type views.
    // If weeks explicitly start on (say) a monday but the first of the month
    // falls on a tuesday, adjust the week# to account for this offset (return the
    // #weeks from the monday of the week containing the start day).
    var extraDays = 0;
    if (firstDayOfWeek == null) {
        firstDayOfWeek = isc.DateChooser.getInstanceProperty("firstDayOfWeek");
    }
    if (firstDayOfWeek != null) {
        extraDays = startDate.getDay() - firstDayOfWeek;
        if (extraDays < 0) extraDays += 7;
    }
    // We want to use 1-based weeks (not zero based) - adding 1 and rounding causes issues, so
    // use Math.ceil() instead
    return Math.ceil((dayDiff + extraDays) / 7);
},

//>!BackCompat 2005.11.3
// -- Older depracated synonym of setNormalDisplayFormat
//>	@classMethod		Date.setFormatter()
//  Set the formatter for all date objects to the method name passed in.  After this call
//  all <code>theDate.toNormalDate()</code> calls will fall through to this formatter function to
//  return the date as a string.
//		@group	dateFormatting
//		@param	functionName	(string)	name of a date formatter method on this Date
//      @visibility internal
//<

setFormatter : function (formatter) {
    Date.setNormalDisplayFormat(formatter);
},
//<!BackCompat

//>	@classMethod Date.setLocaleStringFormatter() (A)
// Set default the +link{Date.iscToLocaleString()} formatter for all date instances.
//
//		@param	format (DateDisplayFormat | function) new formatter for iscToLocaleString()
//		@group	dateFormatting
//      @visibility internal
//<

setLocaleStringFormatter : function (functionName) {
	if (isc.isA.Function(Date.prototype[functionName]) || isc.isA.Function(functionName))
        Date.prototype.localeStringFormatter = functionName;
},


// Localizing dayName / monthNames
//> @classAttr  Date.shortDayNames  (Array : null : IRWA)
// This property may be set to an array of names of days of the week. <br>
// For example:
// <pre>
// ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
// </pre>
// The appropriate day name will then be returned from +link{date.getShortDayName()}, and may
// be used whenever SmartClient components display day-names (for example in the
// +link{class:DateItem, DateItem class}).<br>
// Note: For US based applications the first item in the array should be the name for Sunday,
// then Monday, Tuesday, etc. For browsers with different locales this may vary.
// To determine the first day for some locale, you can run the following code:
// <pre>
//    alert(new Date(2000, 0, 2).getDay());
// </pre>
// You should see an alert with a number between zero and 6. This represents the numerical
// 'day' value for Sunday for your browser's locale, since Jan 2nd 2000 was a Sunday.
// Therefore if this code alerted the number 6, Sunday should appear last in your list
// of day-names, and Monday first.
// @group i18nMessages
// @visibility external
//<



//> @classAttr  Date.dayNames  (Array : null : IRWA)
// This property may be set to an array of names of days of the week. <br>
// For example:
// <pre>
// ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
// </pre>
// The appropriate day name will then be returned from +link{date.getDayName()}, and may
// be used whenever SmartClient components display day-names (for example in the
// +link{class:DateItem, DateItem class}).<br>
// @group i18nMessages
// @visibility external
//<
dayNames: ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"],

//> @classAttr  Date.shortMonthNames  (Array : null : IRWA)
// This property may be set to an array of shortened month-names.<br>
// For example:
// <pre>
// ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
// </pre>
// The appropriate month name will then be returned from +link{date.getShortMonthName()},
// and may be used whenever SmartClient components display month-names (for example in the
// +link{class:DateItem, DateItem class}).
// @group i18nMessages
// @visibility external
//<


derivedShortMonthNameLength: 3,

//> @classAttr  Date.monthNames  (Array : null : IRWA)
// This property may be set to an array of names of months.<br>
// For example:
// <pre>
// ["January", "February", "March", "April", "May", "June", "July", 
//  "August", "September", "October", "November", "December"]
// </pre>
// The appropriate month name will then be returned from +link{date.getMonthName()},
// and may be used whenever SmartClient components display month-names (for example in the
// +link{class:DateItem, DateItem class}).
// @group i18nMessages
// @visibility external
//<
monthNames: ["January","February","March","April","May","June","July","August","September",
             "October","November","December"],

//>	@classMethod date.getShortMonthNames() (A)
// Return an array of the short names of each month, suitable for us in a selection list, etc.
// If +link{Date.shortMonthNames} is specified, this list will be used - by default, all locales
// specify shortMonthNames. 
// @param length (int) maximum length of each day string - default is no maximum
// @return (Array of String) array of short month names
// @group dateFormatting
//<
getShortMonthNames : function (length) {
    var rawNames = Date.shortMonthNames;

    
    
    // NOOP starts - this block of code will never run, because shortMonthNames will alway be set
    if (rawNames == null) rawNames = Date._derivedShortMonthNames;
    if (rawNames == null) {
        var list = Date._derivedShortMonthNames = [];
        for (var i = 0; i < 12; i++) {
            // Changed the day in this synthetic date to 2 in order to derive the
            // correct month in timezones that are ahead of GMT (if you convert
            // midnight on the first of a month to UTC in such timezones, you
            // get the previous month...)
            var date = Date.createLogicalDate(2000,i,2);
            // have deriveShortMonthNames() return the shortened strings according to the
            // internal default (3 chars)
            list[i] = date.deriveShortMonthName(Date.derivedShortMonthNameLength);
        }
        rawNames = Date._derivedShortMonthNames;
    }
    // NOOP ends
    
    var names = [];
    for (var i =0; i< 12; i++) {
        if (!length) {
            // zero or null length - return the full rawName - we used to default to 3 chars,
            // but that's a bit pointless, since the rawNames are already *short*MonthNames, 
            // but they may not be 3 chars long, or of *any* fixed length
            names[i] = rawNames[i];
        } else {
            names[i] = rawNames[i].substring(0,length);
        }
    }
    return names;
},

//>	@classMethod date.getMonthNames() (A)
// Return an array of the full names of each month, suitable for us in a selection list, etc.
// If +link{Date.monthNames} is specified, this list will be used. Otherwise the value
// will be derived from the native browser date formatters.  Note, if we have to derive names 
// from the native browser date string, the day names may be in an abbreviated form, like the 
// result of calling +link{getShortMonthNames()} - we have no control over this, we have to work
// with whatever the browser returns, which may vary by browser as well as locale.  If a 
// consistent and correct set of day names is important in your application, ensure that 
// <code>Date.monthNames</code> is set.
// @group dateFormatting
// @return (Array of String) array of month names
//<
getMonthNames : function () {
    var rawNames = Date.monthNames;
    if (rawNames == null) rawNames = Date._derivedMonthNames;
    if (rawNames == null) {
        var list = Date._derivedMonthNames = [];
        for (var i = 0; i < 12; i++) {
            // Changed the day in this synthetic date to 2 in order to derive the
            // correct month in timezones that are ahead of GMT (if you convert
            // midnight on the first of a month to UTC in such timezones, you
            // get the previous month...)
            var date = Date.createLogicalDate(2000,i,2);
            list[i] = date.deriveMonthName();
        }
        rawNames = Date._derivedMonthNames;
    }
    return rawNames;
},

//>	@classMethod date.getShortDayNames() (A)
// Return an array of the short names of each day, suitable for us in a selection list, etc.
// Day names are picked up from a +link{Date.shortDayNames} list specified in each locale.
// @group dateFormatting
// @param length (int) maximum length of each day string - default is no maximum
// @return (Array of String) array of short day names
//<
getShortDayNames : function (length) {
    length = length || 3;
        var rawNames = Date.shortDayNames;
    if (rawNames == null) rawNames = Date._derivedShortDayNames;
    if (rawNames == null) {
        Date._derivedShortDayNames = [];
        var dateObj = new Date();
        dateObj.setDate(1);
        if (dateObj.getDay() > 0) dateObj.setDate(dateObj.getDate() + (7-dateObj.getDay()));
        var startDate = dateObj.getDate();
        for (var i = 0; i < 7; i++) {
            dateObj.setDate(startDate + i);
            Date._derivedShortDayNames[i] = dateObj.deriveShortDayName();
        }
        rawNames = Date._derivedShortDayNames;
    }
    var names = [];
    for (var i = 0; i < 7; i++) {
        names[i] = rawNames[i].substring(0,length);
    }
    return names;
},

//>	@classMethod date.getDayNames() (A)
// Return an array of the full names of each day, suitable for us in a selection list, etc.
// Day names will be picked up from +link{Date.dayNames} if specified - otherwise derived
// from the native browser date string.  Note, if we have to derive names from the native 
// browser date string, the day names may be in an abbreviated form, like the result of 
// calling +link{getShortDayNames()} - we have no control over this, we have to work with
// whatever the browser returns, which may vary by browser as well as locale.  If a consistent
// and correct set of day names is important in your application, ensure that 
// <code>Date.dayNames</code> is set.
// @group dateFormatting
// @return (string[]) array of day names
//<
getDayNames : function () {
    var rawNames = Date.dayNames;
    if (rawNames == null) rawNames = Date._derivedDayNames;
    if (rawNames == null) {
        Date._derivedDayNames = [];
        var dateObj = new Date();
        dateObj.setDate(1);
        if (dateObj.getDay() > 0) dateObj.setDate(dateObj.getDate() + (7-dateObj.getDay()));
        var startDate = dateObj.getDate();
        for (var i = 0; i < 7; i++) {
            dateObj.setDate(startDate + i);
            Date._derivedShortDayNames[i] = dateObj.deriveDayName();
        }
        rawNames = Date._derivedDayNames;
    }
    var names = [];
    for (var i = 0; i < 7; i++) {
        names[i] = rawNames[i];
    }
    return names;
},

//> @classAttr Date.weekendDays (Array of int : [0, 6] : IR)
// Days that are considered "weekend" days.   Values should be the integers returned by the
// JavaScript built-in Date.getDay(), eg, 0 is Sunday and 6 is Saturday.  Override to
// accommodate different workweeks such as Saudi Arabia (Saturday -> Wednesday) or Israel
// (Sunday -> Thursday).
//
// @visibility external
//<

//> @classMethod Date.setWeekendDays()
// Sets the days that are considered +link{Date.weekendDays, weekend days}.  The parameter 
// should be array of the integers returned by the JavaScript built-in Date.getDay(), eg, 0 is 
// Sunday and 6 is Saturday.  Override to accommodate different workweeks such as Saudi Arabia 
// (Saturday -> Wednesday) or Israel (Sunday -> Thursday).
//
// @param weekendDays (Array of Integer) the array of day-numbers to assign as weekend days
// @visibility external
//<
setWeekendDays : function (weekendDays) {
    Date.weekendDays = weekendDays;
},

//> @classMethod Date.getWeekendDays()
// Return an array of days that are considered "weekend" days. Values will be the integers
// returned by the JavaScript built-in Date.getDay(), eg, 0 is Sunday and 6 is Saturday.
// Override +link{date.weekendDays} to accommodate different workweeks such as Saudi Arabia
// (Saturday -> Wednesday) or  Israel (Sunday -> Thursday).
// @group dateFormatting
//
// @return (Array of integer) array of weekend days
// @visibility external
//<
getWeekendDays : function () {
    var daysArr = Date.weekendDays;
    if (daysArr == null) daysArr = Date._derivedWeekendDays;
    if (daysArr == null) {
        daysArr = Date._derivedWeekendDays = [0, 6];
    }
    return daysArr;
},

getFormattedDateRangeString : function (fromDate, toDate) {
    if (fromDate != null && !isc.isA.Date(fromDate)) {
        fromDate = null;
    }
    if (toDate != null && !isc.isA.Date(toDate)) {
        toDate = null;
    }
    var fromMonth = fromDate ? fromDate.getMonth() : null,
        fromMonthName = fromDate ? fromDate.getShortMonthName() : null,
        fromYear = fromDate ? fromDate.getFullYear() : null,
        fromDay = fromDate ? fromDate.getDate() : null,
        toMonth = toDate ? toDate.getMonth() : null,
        toMonthName = toDate ? toDate.getShortMonthName() : null,
        toYear = toDate ? toDate.getFullYear() : null,
        toDay = toDate ? toDate.getDate() : null,
        result = ""
    ;

    if (fromDate && toDate) {
        if (fromYear == toYear) {
            // dates are in the same year - check the months
            if (fromMonth == toMonth) {
                // dates are in the same month - check the day-numbers
                if (fromDay == toDay) {
                    // dates are the same - use just the one date
                    result = fromMonthName + " " + fromDate.getDate() + ", " + fromYear;
                } else {
                    // day-numbers are different, use "month start - end, year"
                    result = fromMonthName + " " + fromDate.getDate() + " - " +
                        toDate.getDate() + ", " + fromYear;
                }
            } else {
                // dates are in different months, use "month start - month end, year"
                result = fromMonthName + " " + fromDate.getDate() + " - " +
                    toMonthName + " " + toDate.getDate() + ", " + fromYear;
            }
        } else {
            // different years - use "month start year - month end year"
                result = fromMonthName + " " + fromDate.getDate() + ", " + fromYear + " - " +
                    toMonthName + " " + toDate.getDate() + ", " + toYear;
        }
    } else if (fromDate) {
        // only a fromDate provided use "month start - end, year"
        result = fromMonthName + " " + fromDate.getDate() + ", " + fromYear;
    } else if (toDate) {
        // only a toDate provided use "month start - end, year"
        result = toMonthName + " " + toDate.getDate() + ", " + toYear;
    }

    return result;
}

});

//
//	add methods to the Date.prototype for additional formatting options
//
isc.addMethods(Date.prototype, {

//>	@method		date.duplicate()	(A)
//      Copy the value of this date into a new Date() object for independent manipulation
//  @visibility external
//<
duplicate : function () {
    var newDate = new Date();
    newDate.setTime(this.getTime());
	newDate.logicalDate = this.logicalDate;
    newDate.logicalTime = this.logicalTime;
    newDate._fromRelativeDate = this._fromRelativeDate;
    newDate._relativeDateTimestamp = this._relativeDateTimestamp
    return newDate;
},

//>	@method		date.clearTimeFields()	(A)
//			Zero-out the time fields for a date.
//		@group	dateFormatting
//<
clearTimeFields : function () {
	this.setHours(0);
	this.setMinutes(0);
	this.setSeconds(0);
	this.setMilliseconds(0);
	return this;
},




// Determine the day name from this.toString()
deriveShortDayName : function (length) {
	var string = this.toString();
    if (length == null || length <=0 || length > 3) length = 3;
	return string.substring(0,length);
},

// Determine the day name from this.toString(), without a target length
deriveDayName : function () {
	var string = this.toString();
    var length = string.indexOf(" ");
	return string.substring(0,length);
},

//>	@method		date.getShortDayName()
// Return the abbreviated (up to 3 chars) day of week name for this date (Mon, Tue, etc).
// To modify the value returned by this method, set +link{Date.shortDayNames}
//
//		@group	dateFormatting
//      @param  length  (int)    Number of characters to return (Defaults to 3, can't be
//                                  longer than 3)
//		@return		(string)	Abbreviated day name
//      @visibility external
//<
getShortDayName : function () {
    return Date.getShortDayNames()[this.getDay()];
},

//>	@method		date.getDayName()
// Return the full day of week name for this date (Monday, Tuesday, etc).
// To modify the value returned by this method, set +link{Date.dayNames}
//
// @group	dateFormatting
// @return		(string)	Day name
// @visibility external
//<
getDayName : function () {
    return Date.getDayNames()[this.getDay()];
},

// deriveShortMonthNames() - figure out the names of months from the native browser
// date formatting methods.
deriveShortMonthName : function (length) {
    // Use this.toUTCString - to work around Opera's different toString format
	var string = this.toUTCString();
	var start = 8;  // The correct start point if we have a 2-digit day portion in the date
    
    var defaultLength = Date.derivedShortMonthNameLength;
    if (length == null || length < 0 || length > defaultLength) length = defaultLength;

    if (string.substring(6, 7) == ' ') {  // we have a single-digit day number - only IE
                                          // does this, the others put a leading 0 in
        start = 7;
    }
	return string.substring(start, (start+length));
},

deriveMonthName : function () {
    // Use this.toUTCString - to work around Opera's different toString format
	var string = this.toUTCString();
	var start = 8;  // The correct start point if we have a 2-digit day portion in the date
    if (string.substring(6, 7) == ' ') {  // we have a single-digit day number - only IE
                                          // does this, the others put a leading 0 in
        start = 7;
    }
    var length = string.indexOf(" ", start);
	return string.substring(start, (start+length));
},


//>	@method date.getShortMonthName()
// Return the abbreviated name of the month for this date (Jan, Feb, etc)
// To modify the value returned by this method,
// <smartclient>set +link{Date.shortMonthNames}</smartclient>
// <smartgwt>use {@link com.smartgwt.client.util.DateUtil#setShortMonthNames()}</smartgwt>.
// @param length (int) Number of characters to return (Defaults to 3, can't be longer than 3)
// @return (string) Abbreviated month name (3 character string)
// @group dateFormatting
// @visibility external
//<
getShortMonthName : function (length) {
    return Date.getShortMonthNames(length)[this.getMonth()];
},

//>	@method		date.getMonthName()
// Return the full name of the month for this date (January, February, etc)
// To modify the value returned by this method,
// <smartclient>set +link{Date.shortMonthNames}</smartclient>
// <smartgwt>use {@link com.smartgwt.client.util.DateUtil#setMonthNames()}</smartgwt>.
// @group	dateFormatting
// @return		(string)	Month name
// @visibility external
//<
getMonthName : function () {
    return Date.getMonthNames()[this.getMonth()];
},

//>	@method		date.getShortYear()
//      Return a 2 digit year for this date.
//	@group	dateFormatting
//	@return		(string)	year number, padded to 2 characters
//  @visibility external
//<
getShortYear : function () {
	var year = this.getFullYear();
	return (year % 100).stringify(2);
},

//>	@method date.getWeek()
// Returns an integer containing the week number
// @group dateFormatting
// @return (int) week number, starting with 1
// @visibility external
//<
getWeek : function (firstDayOfWeek) {
    var logicalDate = this;

    // Normalize to a logical date, and compare with the logical
    // first day of the year - this will get rid of any oddities around time of day
    // and custom timezones etc (any datetime within the logical day will round to the
    // same logicalDate object)
    if (!this.logicalDate) {
        logicalDate = Date.getLogicalDateOnly(this);
    }
    var yearStart = Date.createLogicalDate(this.getFullYear(),0,1);

    return Date._getWeekOffset(logicalDate, yearStart, firstDayOfWeek);
},

getFiscalCalendar : function () {
    return Date.getFiscalCalendar();
},

//>	@method date.getFiscalYear()
// Returns the +link{FiscalYear} object appropriate for the the current date, according to the
// +link{FiscalCalendar, FiscalCalendar}.
// @return (FiscalYear) the fiscal year object
// @visibility external
//<
getFiscalYear : function (fiscalCalendar) {
    return Date.getFiscalYear(this, fiscalCalendar);
},

//>	@method date.getFiscalWeek()
// Returns the fiscal week number of the current date, according to the global
// +link{Date.setFiscalCalendar, FiscalCalendar}.
// @param [fiscalCalendar] (FiscalCalendar) the object representing the starts of fiscal years
// @return (int) the week number, offset from the start of the fiscal period
// @visibility external
//<
getFiscalWeek : function (fiscalCalendar, firstDayOfWeek) {
    return Date.getFiscalWeek(this, fiscalCalendar, firstDayOfWeek);
},

//
// Date Formatters (toNormalDate(), toShortDate(), etc.)
//
// Date formatters are applied to date objects to convert them into strings for display.
// Dates are intended to be localizable.
// For localization, a developer would typically set either the shortDateFormatter or
// normalDateFormatter, as well as the inputDateFormat, and then call
// "toNormalDate()" / "toShortDate()" and "parseInput()" as normal.

//>	@method		date.toDateStamp()
//			Return this date in the format (UTC timezone):
//				<code><i>YYYYMMDD</i>T<i>HHMMSS</i>[Z]</code>
//		@group	dateFormatting
//		@return					(string)	formatted date string
//  @visibility external
//<
toDateStamp : function () {
	return	this.getUTCFullYear()
		  + (this.getUTCMonth()+1).stringify()
		  + this.getUTCDate().stringify()
		  + "T"
		  +	this.getUTCHours().stringify()
		  + this.getUTCMinutes().stringify()
		  + this.getUTCSeconds().stringify()
		  + "Z";
},

//>	@method date.toNormalDate()
// Returns the date as a formatted string using the format set up via the
// <code>setNormalDisplayFormat()</code> method. Note that the default formatter for this
// method is <code>"toLocaleString"</code>.
// @group   dateFormatting
// @param format (DateDisplayFormat) Optional Format for the date returned
// @return  (string) formatted date string
// @visibility external
//<
// This method is used by our data components such as ListGrid to display long format dates.
// @param useCustomTimezone (boolean) If true, format the date using the timezone
//  setDefaultDisplayTimezone() rather than the native browser locale.
//  Defaults to true.
//  Has no effect if no custom timezone applied
//  * Note that the native browser formatters including toLocaleString won't respect the
//    developer specified timezone of course. We could workaround this (create a new date, shift
//    by offset between specified timezone and native timezone, and call the native formatter on that)
//    but we currently don't.
toNormalDate : function (formatter, useCustomTimezone) {

    
    if (!formatter) formatter = this.formatter;
    // fire the formatter in the scope of this date, so date is available as 'this'

    if (isc.isA.Function(formatter)) {
        return formatter.apply(this, [useCustomTimezone])
    } else if (this[formatter]) {
        return this[formatter](useCustomTimezone);
    } else if (isc.isA.String(formatter)) {
        return isc.DateUtil.format(this, formatter);  // WWW - what about useCustomTimezone??
    }
},

toNormalDateTime : function (formatter, useCustomTimezone) {
    return this.toNormalDatetime(formatter, useCustomTimezone);
},

//>	@method date.toNormalDatetime()
// Returns the datetime as a formatted string using the format set up via the
// <code>setNormalDatetimeDisplayFormat()</code> method.
// @group   dateFormatting
// @param format (DateDisplayFormat) Optional Format for the date returned
// @param [useCustomTimezone] (Boolean) If a custom timezone has been set via
//   Time.setDefaultDisplayTimezone(), by default date formatters will respect this timezone.
//   To suppress this behavior, this parameter should be set to false.
// @return  (string) formatted date string
// @visibility external
//<
toNormalDatetime : function (formatter, useCustomTimezone) {
    if (!formatter) formatter = this.datetimeFormatter;
    return this.toNormalDate(formatter, useCustomTimezone);
},

//>	@method date.toShortDate()
// Returns the date as a formatted string using the format set up via the
// <code>setShortDisplayFormat()</code> method.
// @group   dateFormatting
// @param format (DateDisplayFormat) Optional Format for the date returned
// @param [useCustomTimezone] (Boolean) If a custom timezone has been set via
//   Time.setDefaultDisplayTimezone(), by default date formatters will respect this timezone.
//   to suppress this behavior, this parameter should be set to false.
// @return  (string) formatted date string
// @visibility external
//<

toShortDate : function (formatter, useCustomTimezone) {
    if (!formatter) formatter = this._shortFormat;
    if (isc.isA.Function(formatter)) return formatter.apply(this, [useCustomTimezone]);
    else if (isc.isA.Function(this[formatter])) {
        if (formatter == "toSerializeableDate") return this[formatter]();
        return this[formatter](useCustomTimezone);
    } else if (isc.isA.String(formatter)) {
        return isc.DateUtil.format(this, formatter);  // WWW - what about useCustomTimezone??
    }

    isc.logWarn("Date.toShortDate() specified formatter not understood:" + formatter);
    return this.toUSShortDate();

},


//>	@method date.toShortDateTime()
// Returns the datetime as a formatted string using the format set up via the
// <code>setShortDatetimeDisplayFormat()</code> method.
// @group   dateFormatting
// @param format (DateDisplayFormat) Optional Format for the date returned
// @param [useCustomTimezone] (Boolean) If a custom timezone has been set via
//   Time.setDefaultDisplayTimezone(), by default date formatters will respect this timezone.
//   to suppress this behavior, this parameter should be set to false.
// @return  (string) formatted date string
// @visibility external
//<



toShortDateTime : function (formatter, useCustomTimezone) {
    return this.toShortDatetime(formatter,useCustomTimezone);
},

toShortDatetime : function (formatter, useCustomTimezone) {
    if (!formatter) formatter = this._shortDatetimeFormat;
    return this.toShortDate(formatter, useCustomTimezone);
},


//>	@method date.setDefaultDateSeparator
// Sets a new default separator that will be used when formatting dates. By default, this
// is a forward slash character: "/"
// @group dateFormatting
// @param separator (string) separator to use in dates
// @visibility external
//<
setDefaultDateSeparator : function (separator) {
    this._shortDateTemplate = [,,,,separator,,,,,separator,,,,null];
    this._separator = separator;
},

//>	@method date.getDefaultDateSeparator
// gets the default date separator string
// @group dateFormatting
// @return(string) the default date separator
// @visibility external
//<
getDefaultDateSeperator : function (separator) {
    if (this._separator) return this._separator;
    else return "/";
},


_shortDateTemplate:[,,,,"/",,,,,"/",,,,null],
_$MDY:"MDY",
_$DMY:"DMY",
_$YMD:"YMD",
_$MDY:"MDY",

// _applyTimezoneOffset()
// shift a date by some arbitrary number of hours/minutes
// third parameter allows you to specify the starting date time [result of date.getTime()]
// to offset from
_applyTimezoneOffset : function (hourOffset, minuteOffset, dateTime) {
    if (dateTime == null) dateTime = this.getTime();
    if (isc.isA.Number(hourOffset)) dateTime += (3600000 * hourOffset);
    if (isc.isA.Number(minuteOffset)) dateTime += (60000 * minuteOffset);
    this.setTime(dateTime);
},

// _getTimezoneOffsetDate()
// This is a helper method - given a date with a certain UTC time, apply an explicit timezone
// offset to return a date where the UTC time is offset by the specified hours/minutes.
// We'll use this when formatting dates for display in arbitrary local times [so we can't just
// use the native browser local timezone methods like getHours()]

_getTimezoneOffsetDate : function (hourOffset, minuteOffset) {
    var offsetDate = Date._timezoneOffsetDate;
    if (offsetDate == null) offsetDate = Date._timezoneOffsetDate = new Date();

    offsetDate._applyTimezoneOffset(hourOffset, minuteOffset, this.getTime());
    return offsetDate;

},


// _toShortDate()
// Internal method to give us a shortDate - either DD/MM/YYYY, MM/DD/YYYY or YYYY/MM/DD.
// this will be passed "MDY" / "DYM" / etc. as a format parameter.
// useCustomTimezone parameter: use the hour and minute offset specified by
// Time.setDefaultDisplayTimezone() rather than the native browser local timezone
_$zero:"0",
_toShortDate : function (format, useCustomTimezone) {

    // if this is a "logical date", don't use the developer-specified custom timezone when
    // formatting. Typically handled by DBC's passing in the useCustomTimezone parameter, but
    // we can also check for the logical date marker
    
    if (useCustomTimezone == null) {
        useCustomTimezone = !this.logicalDate;
    }
    var template = this._shortDateTemplate,
        month,day,year;

    // Browser native locale timezone
    if (!useCustomTimezone || !isc.Time._customTimezone) {
        month = this.getMonth()+1;
        day = this.getDate();
        year = this.getFullYear();

    // Developer specified custom timezone
    } else {
        var offsetDate = this._getTimezoneOffsetDate(
                            isc.Time.getUTCHoursDisplayOffset(this),
                            isc.Time.getUTCMinutesDisplayOffset(this)
                         );

        month = offsetDate.getUTCMonth() + 1;
        day = offsetDate.getUTCDate();
        year = offsetDate.getUTCFullYear();
    }

    var monthIndex, dayIndex, yearIndex;

    if (format == this._$MDY) {
        monthIndex = 0;
        dayIndex = 5;
        yearIndex = 10;
    } else if (format == this._$DMY) {
        dayIndex = 0;
        monthIndex = 5;
        yearIndex = 10;
    } else if (format == this._$YMD) {
        yearIndex = 0;
        monthIndex = 5;
        dayIndex = 10
    // Unlikely - don't bother avoiding string alloc's for every one of these options
    } else {
        dayIndex = format.indexOf("D")*5;
        yearIndex = format.indexOf("Y")*5;
        monthIndex = format.indexOf("M")*5;
    }

    // Note: each number has 4 slots so it can accommodate a full year
    // For month/day - if we need a leading zero, fill the first slot with it
    // Use fillNumber to fill 3 slots even though we have a max of 2 digits to ensure
    // the last slot gets cleared out if it was populated by a year already.
    template[dayIndex] = day < 10 ? this._$zero : null
    isc._fillNumber(template, day, dayIndex+1, 3);

    template[monthIndex] = month < 10 ? this._$zero : null
    isc._fillNumber(template, month, monthIndex+1, 3);

    template[yearIndex + 1] = null;
    isc._fillNumber(template, year, yearIndex, 4);
    return template.join(isc.emptyString);
},

//>	@method		date.toUSShortDate()
//			Return this date in the format: <code>MM/DD/YYYY</code>
//		@group	dateFormatting
//		@return					(string)	formatted date string
//  @visibility external
//<
toUSShortDate : function (useCustomTimezone) {
    return this._toShortDate(this._$MDY, useCustomTimezone);
},

// _toShortTime - returns the time portion of the date in HH:MM
_timeTemplate:[null,null],
_toShortTime : function (useCustomTimezone) {
    
    return isc.Time.toShortTime(this, "toShortPadded24HourTime");
},

//>	@method		date.toUSShortDateTime()
//  Return this date in the format: <code>MM/DD/YYYY HH:MM</code>
//
//		@group	dateFormatting
//		@return					(string)	formatted date string
//  @visibility external
//<
toUSShortDateTime : function (useCustomTimezone) {
    return this.toUSShortDatetime(useCustomTimezone);
},


toUSShortDatetime : function (useCustomTimezone) {
    return this.toUSShortDate(useCustomTimezone) + " " + this._toShortTime(useCustomTimezone);
},


//>	@method		date.toEuropeanShortDate()
//			Return this date in the format: <code>DD/MM/YYYY</code>
//		@group	dateFormatting
//		@return					(string)	formatted date string
//      @visibility external
//<
toEuropeanShortDate : function (useCustomTimezone) {
    return this._toShortDate(this._$DMY, useCustomTimezone);
},

//>	@method		date.toEuropeanShortDateTime()
// Return this date in the format: <code>DD/MM/YYYY HH:MM</code>.
//		@group	dateFormatting
//		@return					(string)	formatted date string
//      @visibility external
//<
toEuropeanShortDateTime : function (useCustomTimezone) {
    return this.toEuropeanShortDatetime();
},


toEuropeanShortDatetime : function (useCustomTimezone) {
    return this.toEuropeanShortDate(useCustomTimezone) + " " +
            this._toShortTime(useCustomTimezone);
},

//> @method date.toJapanShortDate()
// Return the date in this format: <code>YYYY/MM/DD</code>
// @group dateFormatting
// @return (string) formatted date string
// @visibility external
//<
toJapanShortDate : function (useCustomTimezone) {
    return this._toShortDate(this._$YMD, useCustomTimezone);
},

//>	@method		date.toJapanShortDateTime()
//			Return this date in the format: <code>YYYY/MM/DD HH:MM:SS</code>
//		@group	dateFormatting
//		@return					(string)	formatted date string
//      @visibility external
//<
toJapanShortDateTime : function (useCustomTimezone) {
    return this.toJapanShortDatetime(useCustomTimezone);
},


toJapanShortDatetime : function (useCustomTimezone) {
    return this.toJapanShortDate(useCustomTimezone) + " " + this._toShortTime(useCustomTimezone);
},

//>	@method		date._serialize()	(A)
//			Serialize this date to a string in a format that can be reinstantiated back into a date.
//				<code>$$DATE$$:<i>YYYY</i>-<i>MM</i>-<i>DD</i></code>
//		@group	dateFormatting
//		@return					(string)	formatted date string
//      @visibility internal
//<
_serialize : function () {
    if (isc.Comm._legacyJSMode) {
        // legacy mode: add $$DATE$$ that only our server-side JS parser understands
        return isc.SB.concat('"' + this.toDBDate(), '"');
    } else {
        // any other caller: return code that would reconstruct the same Date in a JS
        // interpreter
        
        return isc.SB.concat("new Date(", this.getTime(), ")");
    }
},



//> @groupDef dateFormatAndStorage
// The SmartClient system has the following features for handling Date and Time type values
// within DataSources and databound components.
// <P>
// DataSources and databound components may define fields of type <code>date</code>,
// <code>time</code>, or <code>datetime</code>.
// <P>
// <h3>"date" handling</h3>
// <P>
// Fields of type +link{type:FieldType,date} are considered to be logical Dates with no time
// value, such as a holiday or birthday.  In the browser, values for "date" fields are stored
// as Date objects, but when formatted for display to the user, they are typically displayed
// without any time information.
// <P>
// When using the SmartClient server framework, "date" values are automatically transmitted
// with year, month and day preserved and time value ignored.
// <P>
// When sent or received in XML or JSON, date field values should be serialized in the
// +externalLink{http://www.w3.org/TR/xmlschema-2/#dateTime,XML Schema date format} - 
// <code>YYYY-MM-DD</code> - are expected to be received in the same format.  Any time value
// present for a "date" field is ignored.
// <smartclient>
// <P>
// The +link{DateUtil.createLogicalDate, createLogicalDate} method may be used to create a new 
// Date object to represent a logical date value on the browser.
// </smartclient>
// <smartgwt>
// <P>
// The +link{DateUtil.createLogicalDate, createLogicalDate} method may be used to create a new 
// Date object to represent a logical date value on the browser.
// </smartgwt>
// <P>
// System wide formatting for dates may be controlled via the
// +link{Date.setNormalDisplayFormat()} and +link{Date.setShortDisplayFormat()} methods.
// <P>
// <h3>"datetime" handling</h3>
// <P>
// Fields of type +link{type:FieldType,datetime} are dates with full time information.
// In the browser, values for datetime fields are stored as Date objects.
// <P>
// When using the SmartClient server framework, "datetime" values are automatically transmitted
// such that the resulting Date object has the same GMT/UTC timestamp (milliseconds since
// epoch).
// <P>
// When sent or received in XML or JSON, datetime field values should be serialized out as full
// datetimes using the standard
// +externalLink{http://www.w3.org/TR/xmlschema-2/#dateTime,XML Schema datetime format}
// (EG:<code>2006-01-10T12:22:04-04:00</code>).  If no timezone offset is supplied, the value
// is assumed to be GMT/UTC.
// <P>
// System wide formatting for datetimes may be controlled via the
// +link{Date.setShortDatetimeDisplayFormat()} method.  Datetimes will be displayed to the user
// in browser local time by default (see also timezone notes below).
// <P>
// <h3>"time" handling</h3>
// <P>
// Fields of type +link{type:FieldType,time} are time values in the absence of a day, such as
// the beginning of the workday (9:00).  In the browser, values for "time" fields are stored as
// Date objects with the time in browser local time.  The date information has no meaning and
// only the time information is displayed to the user.
// <P>
// Time formatting is handled by the +link{Time} class APIs.
// <br>
// When using the SmartClient server framework, "time" values are automatically transmitted
// such that the resulting Date object has the same hour, minute and second values in local
// time, and year/month/day is ignored.
// <P>
// When sent or received in XML or JSON, date field values should be serialized as hours,
// minutes and seconds using the standard
// +externalLink{http://www.w3.org/TR/xmlschema-2/#dateTime,XML Schema time format} -
// <code>"22:01:45"</code>.  Timezone is not relevant and should be omitted.
// <smartclient>
// <P>
// The +link{Date.createLogicalTime()} method may be used to create a new Date object to represent
// a logical time value on the browser.
// </smartclient>
// <smartgwt>
// <P>
// The DateUtil.createLogicalTime() method may be used to create a new Date object to represent
// a logical time value on the browser.
// </smartgwt>
// <P>
// <h3>Timezone settings and Daylight Savings Time</h3>
// <P>
// By default, "datetime" values will be shown to the user in browser local time, as derived
// from the native browser locale.  Developers may modify this behavior by specifying an
// explicit display timezone via +link{Time.setDefaultDisplayTimezone()}.
// <P>
// Note that depending on the specific date being displayed, a Daylight Savings Time offset may
// also be applied based on the browser locale.  To disable this behavior set
// +link{isc.Time.adjustForDST} to false.
// <P>
// If a custom timezone is specified, it will be respected by all +link{TimeDisplayFormat}s, and
// by the standard short +link{DateDisplayFormat}s when formatting dates representing datetime
// type values. However native JavaScript Date formatters,
// including <code>toLocaleString()</code> will not respect the specified timezone. Developers
// specifying a custom timezone may therefore wish to modify the +link{Date.setNormalDisplayFormat()}
// to avoid using a native JS Date formatter function.
// <P>
// Note that in addition to the system-wide date, datetime and time-formatting settings described
// above, databound components also support applying custom display formats for date values.
// Typically this can be achieved via a custom <code>dateFormatter</code> or
// <code>timeFormatter</code> at the field level (see +link{dataSourceField.dateFormatter},
// +link{dataSourceField.timeFormatter} and for example +link{listGridField.dateFormatter}).
// Date formatting may also be configured at the component level by setting the
// <code>dateFormatter</code>, <code>datetimeFormatter</code> and <code>timeFormatter</code>
// attributes (See for example +link{listGrid.dateFormatter}, +link{listGrid.timeFormatter},
// and +link{listGrid.datetimeFormatter}).
// <P>
// <h3>Troubleshooting Date and Time values</h3>
// <P>
// Date and time storage and timezones can be confusing, and Isomorphic receives a steady
// stream of false bug reports from users that are incorrectly analyzing logs and diagnostics.
// Please consider the following points when troubleshooting issues such as date values
// changing to a different day, or datetime value shifting when saved and reloaded:
// <P>
// <h4>1. compare values for "datetime" fields via date.getTime()</h4>
// <P>
// Whenever you use Date.toString() (client or server-side) the value you get is based on the
// server or browser timezone.
// <P>
// Perhaps you are troubleshooting an issue with datetimes and you try to log the value of a
// Date like this:
// <pre>
//    Date someDate = &lt;<i>some expression</i>&gt;;
//    log("date value is: " + someDate);
// </pre>
// Code like this will show the datetime value in the server's timezone if executed
// server-side, and in the client's timezone if executed client-side.  If they are in different
// timezones, the hour or day will be different, <b>whereas the actual datetime value -
// milliseconds since epoch as retrieved by Date.getTime() - is the same</b>.  To correctly
// compare two datetime values, compare the result of getTime().
// <P>
// <h4>2. "date" and "time" field values <b>cannot</b> be compared via getTime()</h4>
// <P>
// This is the inverse situation as for "datetime" values.  As explained above, "date" values
// have no meaningful values for time fields (hours/minutes/seconds) and "time" values have no
// meaningful values for date fields (month/day/year).  Here, the result of Date.getTime() is
// not meaningful, and values should be compared via getHours(), getMonth() et al.
// <P>
// <h4>3. the display timezone does not affect Date.getHours(), Date.getDay() et al</h4>
// <P>
// If you've called setDefaultDisplayTimezone() to cause all datetime values to be rendered in
// a particular timezone, this does not affect the return values of Date.getHours(), which will
// still return values for the browser's current timezone.  Hence it is not a bug if you have a
// "datetime" value which is displaying as 4am, but getHours() returns 10 or some other
// number.  This just reflects the timezone offset between the timezone passed to
// setDefaultDisplayTimezone() and the browser's local timezone.
// <P>
// <h4>4. use correct DataSourceField types and use the matching FormItem type</h4>
// <P>
// If you declare a field as type "date" but values you provide actually contain specific
// hours, minutes and seconds, these will not be preserved.  The system will discard or reset
// the hours, minutes and seconds in the course of serialization or editing.  Likewise
// if you declare a field as type "time" but actually provide values where year, month and day
// have meaning, these values will be dropped.
// <P>
// Similarly, DateItem expects values for "date" fields, TimeItem expects values for "time"
// fields, and DateTimeItem expects values for "datetime" fields.  Providing the wrong type of
// value to a control, such as providing a value from a "datetime" field to a DateItem, will
// have unspecified results.
// <P>
// <smartclient>
// If you want to take the date and time aspects of a "datetime" value and edit them in separate
// FormItems, use +link{Date.getLogicalDateOnly()} and +link{Date.getLogicalTimeOnly()} to
// split a datetime value into date and time values, and use
// +link{Date.combineLogicalDateAndTime()} to re-combine such values. Otherwise it is very
// easy to make mistakes related to timezone offsets.
// </smartclient>
// <smartgwt>
// If you want to take the date and time aspects of a "datetime" value and edit them in separate
// FormItems, use
// <code>getLogicalDateOnly()</code> and <code>DateUtil.getLogicalTimeOnly()</code> to
// split a datetime value into date and time values, and use
// <code>DateUtil.combineLogicalDateAndTime()</code> to re-combine
// such values. Otherwise it is very
// easy to make mistakes related to timezone offsets.
// </smartgwt>
// <P>
// <h4>5. check data at every phase when troubleshooting</h4>
// <P>
// If you're having a problem with round-tripping "datetime" values or "date" values shifting
// to another day, you need to isolate the problem to a specific layer.  Bearing in mind the
// techniques above for comparing values, you potentially need to look at any/all of the
// following:
// <ol>
// <li> what value do I have on the server-side before it's sent to the client?
// <li> what value is being transmitted to the client? (use the RPC Tab of the Developer
// Console to see the actual data sent)
// <ul>
// <li> was the value shifted to a different time/date by my serialization approach?
// <li> does it have the right format? (see above for correct JSON/XML formats)
// </ul>
// <li> what value do I have on the client before it gets to any widgets (eg, do a direct call
// to +link{DataSource.fetchData()} and inspect the data in the callback)
// <li> what value does the FormItem or other editing widget report before saving is attempted?
// <li> what value is reported right before the value is serialized for transmission to the
// server (+link{DataSource.transformRequest()} is a good place to check)
// <li> what value is being transmitted to the server? (use the RPC tab - same concerns as for
// server-to-client transmission above)
// <li> what value does the server have after de-serialization, before saving to the database
// or other permanent storage?
// <li> what value is sent to the database or permanent storage?  If generating SQL or another
// similar query language, does the value in the SQL statement include an explicit timezone?
// If not, how will the database interpret it?
// </ol>
//
// @title Date and Time Format and Storage
// @treeLocation Concepts
// @visibility external
//<


_xmlSerialize : function (name, type, namespace, prefix) {
	return isc.Comm._xmlValue(name, this.toSchemaDate(null, isc.Comm._trimMillis),
                              type || (this.logicalDate ? "date" :
                                        (this.logicalTime &&
                                        !isc.DataSource.serializeTimeAsDatetime ? "time" : "datetime")),
                              namespace, prefix);
},

// logicalType parameter - option to specify "date" vs "datetime" vs "time" which impacts
// how this date instance should be serialized out.
// Alternatively logicalDate / logicalTime attributes may be hung onto the date objet
// directly.
// Used by DataSources when serializing dates out
toSchemaDate : function (logicalType, trimMillis) {
    // logical date values have no meaningful time
    // Note that they also have "no meaningful timezone" - we display native browser locale time
    // to the user and when we serialize to send to the server we serialize in that same
    // local timezone.
    if ((logicalType == "date") || this.logicalDate) {
        return isc.SB.concat(
			this.getFullYear().stringify(4),
			"-",
			(this.getMonth() + 1).stringify(2), 	// getMonth() is zero-based
			"-",
			this.getDate().stringify(2)
        );
    };

    // logical times are serialized as truncated schema strings (HH:MM:SS) by default
    if ((!isc.DataSource || !isc.DataSource.serializeTimeAsDatetime) &&
        (logicalType == "time" || this.logicalTime))
    {
        var value = isc.SB.concat(
            this.getHours().stringify(2), ":",
            this.getMinutes().stringify(2), ":",
            this.getSeconds().stringify(2));
        if (trimMillis !== true) {
            value += "." + this.getUTCMilliseconds().stringify(3);
        };
        return value;
    }

    // represent date time values in UTC
    var value = isc.SB.concat(
        this.getUTCFullYear().stringify(4),
        "-",
        (this.getUTCMonth() + 1).stringify(2), 	// getMonth() is zero-based
        "-",
        this.getUTCDate().stringify(2),
        "T",
        this.getUTCHours().stringify(2),
        ":",
        this.getUTCMinutes().stringify(2),
        ":",
        this.getUTCSeconds().stringify(2));
    if (trimMillis !== true) {
        value += "." + this.getUTCMilliseconds().stringify(3);
    };
    return value;
},

//>	@method		date.toSerializeableDate()	(A)
// Return this date in 'serialized' format <code>YYYY-MM-DD HH:MM:SS</code>
// @group dateFormatting
// @return (String) formatted date string
// @visibility external
//<

toSerializeableDate : function (useCustomTimezone) {
    var output = isc.SB.create();
    output.append(
			this.getFullYear().stringify(4),
			"-",
			(this.getMonth() + 1).stringify(2), 	// getMonth() is zero-based
			"-",
			this.getDate().stringify(2)
    );
    
    output.append(isc.Comm.xmlSchemaMode ? "T" : " ",
                  isc.Time.toShortTime(this, "toPadded24HourTime"));
    return output.toString();
},

//>	@method		date.toDBDate()	(A)
//			Return this date in the format the database can parse as a datetime:
//				<code>$$DATE$$:<i>YYYY-MM-DD HH:MM:SS</i></code>
//		@group	dateFormatting
//
//		@return					(string)	formatted date string
//  @visibility internal
//<
// Leave this internal for now
toDBDate : function () {
	return isc.StringBuffer.concat(
			"$$DATE$$:",
			this.toSerializeableDate()
			);
},


//>	@method		date.toDBDateTime()	(A)
//			Return this date in the format the database can parse as a dateTime:
//				<code>$$DATE$$:<i>YYYY-MM-DD HH:MM:SS</i></code>
//		@group	dateFormatting
//
//		@return					(string)	formatted date string
//      @visibility internal
//<

toDBDateTime : function () {    return this.toDBDate();       },

//>	@method		date.setFormatter()
//  Set the formatter for this date object to the method name passed in.  After this call
//  wherever appropriate SmartClient components will use this formatter function to return
//  the date as a string.
//		@group	dateFormatting
//		@param	functionName	(string)	name of a date formatter method on this Date
//      @visibility external
//      @deprecated As of SmartClient 5.5 use the static methods
//              +link{classMethod:Date.setNormalDisplayFormat} and
//              +link{classMethod:Date.setShortDisplayFormat} to set default formatters for all dates
//<
setFormatter : function (formatter) {
    this.setNormalDisplayFormat(formatter);
},

//>	@method	date.setLocaleStringFormatter() (A)
//			Set the <code>iscToLocaleString()</code> formatter for a specific date object.
//			After this call, all  <code>theDate.toLocaleString()</code>  calls will yield a string
//			 in this format.
//
//		@param	functionName	(string)	name of a dateFormatting function
//		@group	dateFormatting
//      @visibility internal
//      @deprecated As of SmartClient 5.5 use the static method
//                  +link{classMethod:Date.setLocaleStringFormatter} instead
//<

setLocaleStringFormatter : function (functionName) {
	if (isc.isA.Function(this[functionName]) || isc.isA.Function(functionName))
        this.localeStringFormatter = functionName;
},

// ------------------------Advanced Date Comparison -------------------------------------------
// (currently undocd)
isBeforeToday : function (dateObj) {
    var today = new Date(this.getFullYear(), this.getMonth(), this.getDate(), 0).getTime();
    if (dateObj.getTime() < today) return true;
    else return false;
},

isToday : function (dateObj) {
    if (this.getFullYear() == dateObj.getFullYear() && this.getMonth() == dateObj.getMonth()
        && this.getDate() == dateObj.getDate())
        return true;
    else return false;
},

isTomorrow : function (dateObj) {
    var tomorrowStart = new Date(this.getFullYear(), this.getMonth(), this.getDate() + 1, 0);
    var tomorrowEnd = new Date(this.getFullYear(), this.getMonth(), this.getDate() + 1, 23);
    var dateTime = dateObj.getTime();
    if (dateTime >= tomorrowStart.getTime() && dateTime <= tomorrowEnd.getTime()) {
        return true;
    } else {
        return false;
    }
},

isThisWeek : function (dateObj) {
    var weekStart = new Date(this.getFullYear(), this.getMonth(), this.getDate() - this.getDay(), 0);
    var weekEnd = new Date(this.getFullYear(), this.getMonth(), this.getDate() + (7 - this.getDay()), 23);
    var dateTime = dateObj.getTime();
     if (dateTime >= weekStart.getTime() && dateTime <= weekEnd.getTime()) {
        return true;
    } else {
        return false;
    }
},

isNextWeek : function (dateObj) {
    var weekStart = new Date(this.getFullYear(), this.getMonth(), (this.getDate() - this.getDay()) + 7, 0);
    var weekEnd = new Date(this.getFullYear(), this.getMonth(), (this.getDate() - this.getDay()) + 14, 23);
    var dateTime = dateObj.getTime();
     if (dateTime >= weekStart.getTime() && dateTime <= weekEnd.getTime()) {
        return true;
    } else {
        return false;
    }
},

isNextMonth : function (dateObj) {
    var monthStart = new Date(this.getFullYear(), this.getMonth());
    monthStart.setMonth(monthStart.getMonth() + 1);
    if (monthStart.getFullYear() == dateObj.getFullYear() && monthStart.getMonth() == dateObj.getMonth()) {
        return true;
    } else {
        return false;
    }
}

});


//>	@method		date.toBrowserString()
//  Native <code>date.toString()</code> provided by the browser for Date objects
//		@group	dateFormatting
//      @visibility internal
//      @deprecated As of SmartClient 5.5
//<
// Note that the default formatter varies by browser/platform so it's not that useful.
// This was exposed in 5.2 so we're keeping it around for back-compat only
Date.prototype.toBrowserString = Date.prototype.toString;

//>	@method		date.toBrowserLocaleString()    (A)
//  Synonym for <code>date.toLocaleString()</code> provided by the browser for Date objects
//		@group	dateFormatting
//      @visibility internal
//      @deprecated As of SmartClient 5.5
//<

Date.prototype.toBrowserLocaleString = Date.prototype.toLocaleString;

// default the global fiscal year to the start of the calendar year
Date.prototype.fiscalCalendar = { defaultMonth:0, defaultDate:1, fiscalYears: [] };

// set the standard formatter for the date prototype to the native browser string
//	so everything works as normal until it is overridden.
if (!Date.prototype.formatter) Date.setNormalDateDisplayFormat("toLocaleString");
if (!Date.prototype.datetimeFormatter) Date.setNormalDatetimeDisplayFormat("toLocaleString");

// set the standard toShortDate() formatter to US Short Date
if (!Date.prototype._shortFormat) Date.setShortDisplayFormat("toUSShortDate");
if (!Date.prototype._shortDatetimeFormat) Date.setShortDatetimeDisplayFormat("toUSShortDatetime");

//>	@method		date.iscToLocaleString()   (A)
// Customizeable toLocaleString() type method.
// This method is called when isc.iscToLocaleString(date) is called.
//
//		@group	dateFormatting
//		@return				(string)	formatted date string
//      @visibility internal
//<
// Leave this internal - we don't really expect this to be called directly or overridden by
// the developer

Date.prototype.iscToLocaleString = function () {
    var formatter = this.localeStringFormatter;
    if (isc.isA.Function(formatter)) return formatter.apply(this);
    else if (this[formatter]) return this[formatter]();
}

// By default have iscToLocaleString() call date.toLocaleString()
if (!Date.prototype.localeStringFormatter)
    Date.prototype.localeStringFormatter = "toLocaleString";


//>Safari12
isc.addMethods(Date, {
    // Simple substring matching for splitting up a date string to avoid using unsupported
    // string.match() method in early Safari
    // Note - somewhat flawed: we're assuming well never be handed a single digit month or day
    _splitDateViaSubstring : function (string, monthIndex, dayIndex, yearIndex) {

        // We know that year may be after month and/or day - allow 3 chars ("DD/") for each
        var yearCharIndex = yearIndex * 3,
            year = string.substring(yearCharIndex, yearCharIndex +4)
        ;

        // If we have a 2 or 3 char year, this affects the position of the day/month in the
        // string
        var yearLength = year.length;

        var monthCharIndex = 0,
            dayCharIndex = 0;
        if (monthIndex > dayIndex) monthCharIndex += 3;
        else dayCharIndex += 3;

        if (monthIndex > yearIndex) monthCharIndex += yearLength + 1;
        if (dayIndex > yearIndex) dayCharIndex += yearLength + 1;

        // Note: Month is zero based rather than 1 based.
        var month = string.substring(monthCharIndex, monthCharIndex + 2) -1;
        var day = string.substring(dayCharIndex, dayCharIndex +2);

        // Hour minute second are not expected to change orders
        var hourCharIndex = 7 + yearLength,
            hour = (string.substring(hourCharIndex,hourCharIndex + 2) || 0),
            minute = (string.substring(hourCharIndex + 3, hourCharIndex + 5) || 0),
            second = (string.substring(hourCharIndex + 6, hourCharIndex + 8) || 0);

        return[year,month,day,hour,minute,second];
    }
});
//<Safari12

//>!BackCompat 2005.11.3

isc.addMethods(Date.prototype, {

//>	@method		date.toPrettyString()
//			Return this date in the format: <code>MM/DD/YY HH:MM</code>
//	@group  dateFormatting
//	@return (string)	formatted date string
//  @visibility external
//  @deprecated As of SmartClient 5.5 use +link{date.toShortDate()} instead
//<
toPrettyString : function () {
    return this.toUSShortDatetime();
}

});

isc.addMethods(Date, {


// --- Parsing functions --- :
// In 5.2 the paradigm was to provide formatters and complimentary parsers, like
// 'toEuropeanShortDate' and 'parseEuropeanShortDate'.
// We've moved away from this to instead use a single 'parseInput' function which takes a
// 'format' parameter specifying "MDY" / "DMY", etc.
// This is appropriate since we do not plan to provide parsing functions for every date formatter
// format.
// Leaving the older explicit parsing functions in place for back-compat only.

//>	@classMethod	Date.parseStandardDate()
//      Parse a date passed in as a string of format:
//      <code>YYYY-MM-DD HH:MM:SS</code> or <code>YYYY-MM-DD</code>
//      Returning a new <code>Date</code> object with the appropriate value.
//
//      @group  dateFormatting
//
//      @param  dateString  (string)	date value as a string
//
//      @return	(date)      date value
//      @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parseStandardDate : function (dateString) {
    if (!isc.isA.String(dateString)) return null;

    // Note: we could be using a regexp here rather than substring matches
    var year = dateString.substring(0,4),
        month = dateString.substring(5,7)-1,
        day = dateString.substring(8,10),
        hour = dateString.substring(11, 13),
        minute = dateString.substring(14, 16),
        second = dateString.substring(17, 19);

    // If they all are numbers, construct a new date
    // NOTE: If year - month - day gives a number then they
    // are all numbers, or strings that implicitly convert to numbers.
    // We could also use this syntax:
    // if(parseInt(year) == year && parseInt(month) == month ...)
    // but this is slower in both Moz and IE
    if (dateString.length < 19) {
        if (!isc.isA.Number(year - month - day)) return null;
    } else {
        if (!isc.isA.Number(year - month - day - hour - minute - second)) return null;
    }

    return new Date(year, month, day, hour, minute, second);

},

//>	@classMethod	Date.parseSerializeableDate()
//      Parse a date passed in as a string of format:
//      <code>YYYY-MM-DD HH:MM:SS</code> or <code>YYYY-MM-DD</code>
//      Returning a new <code>Date</code> object with the appropriate value.
//      <i>This is a synonym for </i><code>Date.parseStandardDate()</code>
//
//      @group  dateFormatting
//      @param  dateString  (string)	date value as a string
//      @return	(Date)      date value
//      @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parseSerializeableDate : function (dateString) {
    // synonym for parseStandardDate
    return this.parseStandardDate(dateString);
},


//>	@classMethod	Date.parseDBDate()
// Parse a date passed in as a string of format:
//  <code>$$DATE$$:<i>YYYY-MM-DD HH:MM:SS</i></code>
//      Returning a new <code>Date</code> object with the appropriate value.
//
//      @group  dateFormatting
//		@param	dateString  (string)	date value as a string
//		@return	(date)		date value
//      @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parseDBDate : function (dateString) {

    // remove the leading "$$DATE$$:"
    if (isc.isA.String(dateString) && dateString.startsWith("$$DATE$$:")) {
        dateString = dateString.substring(9)
        return this.parseStandardDate(dateString);
    }

    return null;

},

//>	@classMethod	Date.parseDateStamp()
//
// Parse a dateStamp of the format: <code><i>YYYYMMDD</i>T<i>HHMMSS</i>[Z]</code><br><br>
//
// @group  dateFormatting
// @param	dateString	(string)	String to parse
// @return				(Date)		Date object, or null if not parsed correctly.
//
// @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parseDateStamp : function (string) {
	if (string == null || isc.isA.Date(string)) return string;

    var date = new Date( Date.UTC(
                string.substring(0,4),                // year
                parseInt(string.substring(4,6), 10)-1,    // mon
                string.substring(6,8),              // day
                // omit this character (T)
                string.substring(9,11),             // hour
                string.substring(11,13),            // min
                string.substring(13,15)
                // Technically we should look at the last character - if its something other
                // than "z" the timezone would be something other than UTC.
               ));

	if (isc.isA.Date(date)) return date;
	else				return null;

},

//>	@classMethod	Date.parseShortDate()
// Parse a date passed in as a string of format:   <code>MM/DD/YYYY</code>
//
//      @group  dateFormatting
//		@param	dateString  (string)	date value as a string
//      @param  [centuryThreshold]  (int)    if parsed year is 2 digits and less than this
//                                              number, assume year to be 20xx
//
//		@return	(date)		date value
//  @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parseShortDate : function (string, centuryThreshold) {
    return this.parseInput(string, "MDY", centuryThreshold);
},

//>	@classMethod	Date.parseShortDateTime()
// Parse a date passed in as a string of format:   <code>MM/DD/YYYY HH:MM:SS</code>
//
//      @group  dateFormatting
//		@param	dateString  (string)	date value as a string
//      @param  [centuryThreshold]    (int)    if parsed year is 2 digits and less than this
//                                              number, assume year to be 20xx
//
//		@return	(date)		date value
//  @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<

parseShortDateTime : function (string, centuryThreshold) {
    // synonym for parseShortDate - included for completeness and to provide the appropriate
    // compliment to date.toShortDateTime()
    return this.parseShortDate(string, centuryThreshold);
},

//>	@classMethod	Date.parsePrettyString()
// Parse a date passed in as a string of format:   <code>MM/DD/YY HH:MM:SS</code>
//
//      @group  dateFormatting
//		@param	dateString  (string)	date value as a string
//      @param  [centuryThreshold]    (int)    if parsed year is less than this
//                                              number, assume year to be 20xx rather than 19xx
//
//		@return	(date)		date value
//  @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parsePrettyString : function (string, centuryThreshold) {
    // this is just the same as a short date with a 2 digit year.
    return this.parseShortDate(string, centuryThreshold);
},

//>	@classMethod	Date.parseEuropeanShortDate()
//			parse a date passed in as a string of format:   <code>DD/MM/YYYY</code>
//		@group	dateFormatting
//		@param	dateString  (string)	date value as a string
//      @param  [centuryThreshold]    (int)    if parsed year is 2 digits and less than this
//                                              number, assume year to be 20xx
//
//		@return	(date)		date value
//      @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<
parseEuropeanShortDate : function (string, centuryThreshold) {
    return this.parseInput(string, "DMY", centuryThreshold);
},

//>	@classMethod	Date.parseEuropeanShortDateTime()
//			parse a date passed in as a string of format:   <code>DD/MM/YYYY HH:MM:SS</code>
//		@group	dateFormatting
//		@param	dateString  (string)	date value as a string
//      @param  [centuryThreshold]    (int)    if parsed year is 2 digits and less than this
//                                              number, assume year to be 20xx
//
//		@return	(date)		date value
//  @visibility internal
//  @deprecated As of SmartClient 5.5 use +link{date.parseInput} instead
//<

parseEuropeanShortDateTime : function (string, centuryThreshold) {
    return this.parseInput(string, "DMY", centuryThreshold);
},

// Helper to set the time to zero for a datetime

setToZeroTime : function (date) {
    if (date == null || !isc.isA.Date(date)) return date;

    // Clear the "logicalDate" flag so when we run through formatters we respect
    // developer specified timezone rather than displaying time in the browser native timezone
    var wasLogicalDate = date.logicalDate;
    date.logicalDate = false;

    var timestamp = date.getTime();

    // Apply the timezone offset such that if the default system-wide formatter is used
    // and applies the display timezone offset, 00:00 will be seen.
    var hourOffset = isc.Time.getUTCHoursDisplayOffset(date),
        minuteOffset = isc.Time.getUTCMinutesDisplayOffset(date)
    ;

    if (wasLogicalDate) {
        var previousDay = new Date(date);
        previousDay.setHours(0);
        previousDay.setMinutes(0);

        var previousDayHourOffset = isc.Time.getUTCHoursDisplayOffset(previousDay);
        if (hourOffset != previousDayHourOffset) {
            // logical dates have a time of 12-noon - if the date in question happens to be
            // the one that DST changes on, the final date (with a time of 00:00) will have
            // a different hourOffset - use that one instead.
            hourOffset = previousDayHourOffset;
        }
    }

    var utcHours = hourOffset > 0 ? 24-hourOffset : 0-hourOffset,
        utcMins = 60-minuteOffset;

    if (utcMins >= 60) {
        utcMins -= 60;

    // If the minute offset was non-zero and the offset as a whole is positive
    // we need to knock an additional hour off (as the hours/minutes are cumulative so
    // we otherwise will roll forward to 01:00 local time)
    
    } else if (utcMins != 0) {
        utcHours -= 1;
    }

    
    var oldDisplayDate;
    if (wasLogicalDate) {
        oldDisplayDate = date.getDate();
    } else {
        var offsetDate = date._getTimezoneOffsetDate(hourOffset, minuteOffset);
        oldDisplayDate = offsetDate.getUTCDate();
    }
    
    date.setUTCHours(utcHours);
    date.setUTCMinutes(utcMins);

    var displayOffsetDate = date._getTimezoneOffsetDate(hourOffset, minuteOffset),
        displayDate = displayOffsetDate.getUTCDate(),
        adjustedUTCHours = utcHours;

    if (displayDate != oldDisplayDate) {
        // Cant just check for displayDate > oldDisplayDate since it might be the first or
        // last of a month...
        var moveForward = date.getTime() < timestamp;

        adjustedUTCHours += moveForward ? 24 : -24;
        date.setUTCHours(adjustedUTCHours);
    }

    
    if (date.getUTCHours() != utcHours) {
        date.setTime(timestamp);
        date.setUTCHours(adjustedUTCHours+1);
        if (date.getUTCHours() != utcHours+1) {
            date.setTime(timestamp);
            date.setUTCHours(adjustedUTCHours+2);
        }
    }

    // No need to return the date - we updated it directly.

}

});
//<!BackCompat


