text: ﻿/* http://keith-wood.name/calendars.html
     Hebrew calendar for jQuery v2.0.1.
     Written by Keith Wood (kbwood{at}iinet.com.au) August 2009.
     Available under the MIT (http://keith-wood.name/licence.html) license. 
     Please attribute the author if you use it. */
  
  (function($) { // Hide scope, no $ conflict
  
  	/** Implementation of the Hebrew civil calendar.
  		Based on code from <a href="http://www.fourmilab.ch/documents/calendar/">http://www.fourmilab.ch/documents/calendar/</a>.
  		See also <a href="http://en.wikipedia.org/wiki/Hebrew_calendar">http://en.wikipedia.org/wiki/Hebrew_calendar</a>.
  		@class HebrewCalendar
  		@param [language=''] {string} The language code (default English) for localisation. */
  	function HebrewCalendar(language) {
  		this.local = this.regionalOptions[language || ''] || this.regionalOptions[''];
  	}
  
  	HebrewCalendar.prototype = new $.calendars.baseCalendar;
  
  	$.extend(HebrewCalendar.prototype, {
  		/** The calendar name.
  			@memberof HebrewCalendar */
  		name: 'Hebrew',
  		/** Julian date of start of Hebrew epoch: 7 October 3761 BCE.
  			@memberof HebrewCalendar */
  		jdEpoch: 347995.5,
  		/** Days per month in a common year.
  			@memberof HebrewCalendar */
  		daysPerMonth: [30, 29, 30, 29, 30, 29, 30, 29, 30, 29, 30, 29, 29],
  		/** <code>true</code> if has a year zero, <code>false</code> if not.
  			@memberof HebrewCalendar */
  		hasYearZero: false,
  		/** The minimum month number.
  			@memberof HebrewCalendar */
  		minMonth: 1,
  		/** The first month in the year.
  			@memberof HebrewCalendar */
  		firstMonth: 7,
  		/** The minimum day number.
  			@memberof HebrewCalendar */
  		minDay: 1,
  
  		/** Localisations for the plugin.
  			Entries are objects indexed by the language code ('' being the default US/English).
  			Each object has the following attributes.
  			@memberof HebrewCalendar
  			@property name {string} The calendar name.
  			@property epochs {string[]} The epoch names.
  			@property monthNames {string[]} The long names of the months of the year.
  			@property monthNamesShort {string[]} The short names of the months of the year.
  			@property dayNames {string[]} The long names of the days of the week.
  			@property dayNamesShort {string[]} The short names of the days of the week.
  			@property dayNamesMin {string[]} The minimal names of the days of the week.
  			@property dateFormat {string} The date format for this calendar.
  					See the options on <a href="BaseCalendar.html#formatDate"><code>formatDate</code></a> for details.
  			@property firstDay {number} The number of the first day of the week, starting at 0.
  			@property isRTL {number} <code>true</code> if this localisation reads right-to-left. */
  		regionalOptions: { // Localisations
  			'': {
  				name: 'Hebrew',
  				epochs: ['BAM', 'AM'],
  				monthNames: ['Nisan', 'Iyar', 'Sivan', 'Tammuz', 'Av', 'Elul',
  				'Tishrei', 'Cheshvan', 'Kislev', 'Tevet', 'Shevat', 'Adar', 'Adar II'],
  				monthNamesShort: ['Nis', 'Iya', 'Siv', 'Tam', 'Av', 'Elu', 'Tis', 'Che', 'Kis', 'Tev', 'She', 'Ada', 'Ad2'],
  				dayNames: ['Yom Rishon', 'Yom Sheni', 'Yom Shlishi', 'Yom Revi\'i', 'Yom Chamishi', 'Yom Shishi', 'Yom Shabbat'],
  				dayNamesShort: ['Ris', 'She', 'Shl', 'Rev', 'Cha', 'Shi', 'Sha'],
  				dayNamesMin: ['Ri','She','Shl','Re','Ch','Shi','Sha'],
  				dateFormat: 'dd/mm/yyyy',
  				firstDay: 0,
  				isRTL: false
  			}
  		},
  
  		/** Determine whether this date is in a leap year.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year to examine.
  			@return {boolean} <code>true</code> if this is a leap year, <code>false</code> if not.
  			@throws Error if an invalid year or a different calendar used. */
  		leapYear: function(year) {
  			var date = this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
  			return this._leapYear(date.year());
  		},
  
  		/** Determine whether this date is in a leap year.
  			@memberof HebrewCalendar
  			@private
  			@param year {number} The year to examine.
  			@return {boolean} <code>true</code> if this is a leap year, <code>false</code> if not.
  			@throws Error if an invalid year or a different calendar used. */
  		_leapYear: function(year) {
  			year = (year < 0 ? year + 1 : year);
  			return mod(year * 7 + 1, 19) < 7;
  		},
  
  		/** Retrieve the number of months in a year.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year to examine.
  			@return {number} The number of months.
  			@throws Error if an invalid year or a different calendar used. */
  		monthsInYear: function(year) {
  			this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
  			return this._leapYear(year.year ? year.year() : year) ? 13 : 12;
  		},
  
  		/** Determine the week of the year for a date.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year to examine.
  			@param [month] {number} The month to examine.
  			@param [day] {number} The day to examine.
  			@return {number} The week of the year.
  			@throws Error if an invalid date or a different calendar used. */
  		weekOfYear: function(year, month, day) {
  			// Find Sunday of this week starting on Sunday
  			var checkDate = this.newDate(year, month, day);
  			checkDate.add(-checkDate.dayOfWeek(), 'd');
  			return Math.floor((checkDate.dayOfYear() - 1) / 7) + 1;
  		},
  
  		/** Retrieve the number of days in a year.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year to examine.
  			@return {number} The number of days.
  			@throws Error if an invalid year or a different calendar used. */
  		daysInYear: function(year) {
  			var date = this._validate(year, this.minMonth, this.minDay, $.calendars.local.invalidYear);
  			year = date.year();
  			return this.toJD((year === -1 ? +1 : year + 1), 7, 1) - this.toJD(year, 7, 1);
  		},
  
  		/** Retrieve the number of days in a month.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year of the month.
  			@param [month] {number} The month.
  			@return {number} The number of days in this month.
  			@throws Error if an invalid month/year or a different calendar used. */
  		daysInMonth: function(year, month) {
  			if (year.year) {
  				month = year.month();
  				year = year.year();
  			}
  			this._validate(year, month, this.minDay, $.calendars.local.invalidMonth);
  			return (month === 12 && this.leapYear(year) ? 30 : // Adar I
  					(month === 8 && mod(this.daysInYear(year), 10) === 5 ? 30 : // Cheshvan in shlemah year
  					(month === 9 && mod(this.daysInYear(year), 10) === 3 ? 29 : // Kislev in chaserah year
  					this.daysPerMonth[month - 1])));
  		},
  
  		/** Determine whether this date is a week day.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year to examine.
  			@param [month] {number} The month to examine.
  			@param [day] {number} The day to examine.
  			@return {boolean} <code>true</code> if a week day, <code>false</code> if not.
  			@throws Error if an invalid date or a different calendar used. */
  		weekDay: function(year, month, day) {
  			return this.dayOfWeek(year, month, day) !== 6;
  		},
  
  		/** Retrieve additional information about a date - year type.
  			@memberof HebrewCalendar
  			@param year {CDate|number} The date to examine or the year to examine.
  			@param [month] {number} The month to examine.
  			@param [day] {number} The day to examine.
  			@return {object} Additional information - contents depends on calendar.
  			@throws Error if an invalid date or a different calendar used. */
  		extraInfo: function(year, month, day) {
  			var date = this._validate(year, month, day, $.calendars.local.invalidDate);
  			return {yearType: (this.leapYear(date) ? 'embolismic' : 'common') + ' ' +
  				['deficient', 'regular', 'complete'][this.daysInYear(date) % 10 - 3]};
  		},
  
  		/** Retrieve the Julian date equivalent for this date,
  			i.e. days since January 1, 4713 BCE Greenwich noon.
  			@memberof HebrewCalendar
  			@param year {CDate)|number} The date to convert or the year to convert.
  			@param [month] {number} The month to convert.
  			@param [day] {number} The day to convert.
  			@return {number} The equivalent Julian date.
  			@throws Error if an invalid date or a different calendar used. */
  		toJD: function(year, month, day) {
  			var date = this._validate(year, month, day, $.calendars.local.invalidDate);
  			year = date.year();
  			month = date.month();
  			day = date.day();
  			var adjYear = (year <= 0 ? year + 1 : year);
  			var jd = this.jdEpoch + this._delay1(adjYear) +
  				this._delay2(adjYear) + day + 1;
  			if (month < 7) {
  				for (var m = 7; m <= this.monthsInYear(year); m++) {
  					jd += this.daysInMonth(year, m);
  				}
  				for (var m = 1; m < month; m++) {
  					jd += this.daysInMonth(year, m);
  				}
  			}
  			else {
  				for (var m = 7; m < month; m++) {
  					jd += this.daysInMonth(year, m);
  				}
  			}
  			return jd;
  		},
  
  		/** Test for delay of start of new year and to avoid
  			Sunday, Wednesday, or Friday as start of the new year.
  			@memberof HebrewCalendar
  			@private
  			@param year {number} The year to examine.
  			@return {number} The days to offset by. */
  		_delay1: function(year) {
  			var months = Math.floor((235 * year - 234) / 19);
  			var parts = 12084 + 13753 * months;
  			var day = months * 29 + Math.floor(parts / 25920);
  			if (mod(3 * (day + 1), 7) < 3) {
  				day++;
  			}
  			return day;
  		},
  
  		/** Check for delay in start of new year due to length of adjacent years.
  			@memberof HebrewCalendar
  			@private
  			@param year {number} The year to examine.
  			@return {number} The days to offset by. */
  		_delay2: function(year) {
  			var last = this._delay1(year - 1);
  			var present = this._delay1(year);
  			var next = this._delay1(year + 1);
  			return ((next - present) === 356 ? 2 : ((present - last) === 382 ? 1 : 0));
  		},
  
  		/** Create a new date from a Julian date.
  			@memberof HebrewCalendar
  			@param jd {number} The Julian date to convert.
  			@return {CDate} The equivalent date. */
  		fromJD: function(jd) {
  			jd = Math.floor(jd) + 0.5;
  			var year = Math.floor(((jd - this.jdEpoch) * 98496.0) / 35975351.0) - 1;
  			while (jd >= this.toJD((year === -1 ? +1 : year + 1), 7, 1)) {
  				year++;
  			}
  			var month = (jd < this.toJD(year, 1, 1)) ? 7 : 1;
  			while (jd > this.toJD(year, month, this.daysInMonth(year, month))) {
  				month++;
  			}
  			var day = jd - this.toJD(year, month, 1) + 1;
  			return this.newDate(year, month, day);
  		}
  	});
  
  	// Modulus function which works for non-integers.
  	function mod(a, b) {
  		return a - (b * Math.floor(a / b));
  	}
  
  	// Hebrew calendar implementation
  	$.calendars.calendars.hebrew = HebrewCalendar;
  
  })(jQuery);