/* http://keith-wood.name/calendars.html
Hebrew calendar for jQuery v1.1.4.
Written by Keith Wood (kbwood{at}iinet.com.au) August 2009.
Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and
MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses.
Please attribute the author if you use it. */
(function($) { // Hide scope, no $ conflict
/* Implementation of the Hebrew civil calendar.
Based on code from http://www.fourmilab.ch/documents/calendar/.
See also http://en.wikipedia.org/wiki/Hebrew_calendar.
@param language (string) the language code (default English) for localisation (optional) */
function HebrewCalendar(language) {
this.local = this.regional[language || ''] || this.regional[''];
}
HebrewCalendar.prototype = new $.calendars.baseCalendar;
$.extend(HebrewCalendar.prototype, {
name: 'Hebrew', // The calendar name
jdEpoch: 347995.5, // Julian date of start of Hebrew epoch: 7 October 3761 BCE
daysPerMonth: [30, 29, 30, 29, 30, 29, 30, 29, 30, 29, 30, 29, 29], // Days per month in a common year
hasYearZero: false, // True if has a year zero, false if not
minMonth: 1, // The minimum month number
firstMonth: 7, // The first month in the year
minDay: 1, // The minimum day number
regional: { // Localisations
'': {
name: 'Hebrew', // The calendar name
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', // See format options on BaseCalendar.formatDate
firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
isRTL: false, // True if right-to-left language, false if left-to-right
showMonthAfterYear: false, // True if the year select precedes month, false for month then year
yearSuffix: '' // Additional text to append to the year in the month headers
}
},
/* Determine whether this date is in a leap year.
@param year (CDate) the date to examine or
(number) the year to examine
@return (boolean) true if this is a leap year, false 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.
@param year (number) the year to examine
@return (boolean) true if this is a leap year, false 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.
@param year (CDate) the date to examine or
(number) 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.
@param year (CDate) the date to examine or
(number) 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.
@param year (CDate) the date to examine or
(number) 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.
@param year (CDate) the date to examine or
(number) 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.
@param year (CDate) the date to examine or
(number) the year to examine
@param month (number) the month to examine
@param day (number) the day to examine
@return (boolean) true if a week day, false 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.
@param year (CDate) the date to examine or
(number) 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.
@param year (CDate) the date to convert or
(number) 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.
@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.
@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.
@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);