/* http://keith-wood.name/calendars.html
Calendars for jQuery v1.1.0.
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
/* Calendars - generic date access and manipulation. */
function Calendars() {
this.regional = {
'': {invalidCalendar: 'Calendar {0} not found',
invalidDate: 'Invalid {0} date',
invalidMonth: 'Invalid {0} month',
invalidYear: 'Invalid {0} year',
differentCalendars: 'Cannot mix {0} and {1} dates'}
};
this.local = this.regional[''];
this.calendars = {};
this._localCals = {};
}
$.extend(Calendars.prototype, {
/* Obtain a calendar implementation and localisation.
@param name (string) the name of the calendar,
e.g. 'gregorian' (default), 'persian', 'islamic' (optional)
@param language (string) the language code to use for localisation
(optional, default English = 'en')
@return the calendar and localisation
@throws error if calendar not found */
instance: function(name, language) {
name = (name || 'gregorian').toLowerCase();
language = language || '';
var cal = this._localCals[name + '-' + language];
if (!cal && this.calendars[name]) {
cal = new this.calendars[name](language);
this._localCals[name + '-' + language] = cal;
}
if (!cal) {
throw (this.local.invalidCalendar || this.regional[''].invalidCalendar).
replace(/\{0\}/, name);
}
return cal;
},
/* Create a new date - for today if no other parameters given.
@param year (CDate) the date to copy or
(number) the year for the date
@param month (number, optional) the month for the date
@param day (number, optional) the day for the date
@param calendar (*Calendar) the underlying calendar
or (string) the name of the calendar (optional, default Gregorian)
@param language (string) the language to use for localisation (optional, default English)
@return (CDate) the new date
@throws error if an invalid date */
newDate: function(year, month, day, calendar, language) {
calendar = (year != null && year.year ? year.calendar() : (typeof calendar == 'string' ?
this.instance(calendar, language) : calendar)) || this.instance();
return calendar.newDate(year, month, day);
}
});
/* Generic date, based on a particular calendar.
@param calendar (*Calendar) the underlying calendar implementation
@param year (number) the year for this date
@param month (number) the month for this date
@param day (number) the day for this date
@return (CDate) the date object
@throws error if an invalid date */
function CDate(calendar, year, month, day) {
this._calendar = calendar;
this._year = year;
this._month = month;
this._day = day;
if (this._calendar._validateLevel == 0 &&
!this._calendar.isValid(this._year, this._month, this._day)) {
throw ($.calendars.local.invalidDate || $.calendars.regional[''].invalidDate).
replace(/\{0\}/, this._calendar.local.name);
}
}
/* Pad a numeric value with leading zeroes.
@param value (number) the number to format
@param length (number) the minimum length
@return (string) the formatted number */
function pad(value, length) {
value = '' + value;
return '000000'.substring(0, length - value.length) + value;
}
$.extend(CDate.prototype, {
/* Create a new date.
@param year (CDate) the date to copy or
(number) the year for the date (optional, default this date)
@param month (number) the month for the date (optional)
@param day (number) the day for the date (optional)
@return (CDate) the new date
@throws error if an invalid date */
newDate: function(year, month, day) {
return this._calendar.newDate((year == null ? this : year), month, day);
},
/* Set or retrieve the year for this date.
@param year (number) the year for the date (optional)
@return (number) the date's year (if no parameter) or
(CDate) the updated date
@throws error if an invalid date */
year: function(year) {
return (arguments.length == 0 ? this._year : this.set(year, 'y'));
},
/* Set or retrieve the month for this date.
@param month (number) the month for the date (optional)
@return (number) the date's month (if no parameter) or
(CDate) the updated date
@throws error if an invalid date */
month: function(month) {
return (arguments.length == 0 ? this._month : this.set(month, 'm'));
},
/* Set or retrieve the day for this date.
@param day (number) the day for the date (optional)
@return (number) the date's day (if no parameter) or
(CDate) the updated date
@throws error if an invalid date */
day: function(day) {
return (arguments.length == 0 ? this._day : this.set(day, 'd'));
},
/* Set new values for this date.
@param year (number) the year for the date
@param month (number) the month for the date
@param day (number) the day for the date
@return (CDate) the updated date
@throws error if an invalid date */
date: function(year, month, day) {
if (!this._calendar.isValid(year, month, day)) {
throw ($.calendars.local.invalidDate || $.calendars.regional[''].invalidDate).
replace(/\{0\}/, this._calendar.local.name);
}
this._year = year;
this._month = month;
this._day = day;
return this;
},
/* Determine whether this date is in a leap year.
@return (boolean) true if this is a leap year, false if not */
leapYear: function() {
return this._calendar.leapYear(this);
},
/* Retrieve the epoch designator for this date, e.g. BCE or CE.
@return (string) the current epoch */
epoch: function() {
return this._calendar.epoch(this);
},
/* Format the year, if not a simple sequential number.
@return (string) the formatted year */
formatYear: function() {
return this._calendar.formatYear(this);
},
/* Retrieve the month of the year for this date,
i.e. the month's position within a numbered year.
@return (number) the month of the year: minMonth to months per year */
monthOfYear: function() {
return this._calendar.monthOfYear(this);
},
/* Retrieve the week of the year for this date.
@return (number) the week of the year: 1 to weeks per year */
weekOfYear: function() {
return this._calendar.weekOfYear(this);
},
/* Retrieve the number of days in the year for this date.
@return (number) the number of days in this year */
daysInYear: function() {
return this._calendar.daysInYear(this);
},
/* Retrieve the day of the year for this date.
@return (number) the day of the year: 1 to days per year */
dayOfYear: function() {
return this._calendar.dayOfYear(this);
},
/* Retrieve the number of days in the month for this date.
@return (number) the number of days */
daysInMonth: function() {
return this._calendar.daysInMonth(this);
},
/* Retrieve the day of the week for this date.
@return (number) the day of the week: 0 to number of days - 1 */
dayOfWeek: function() {
return this._calendar.dayOfWeek(this);
},
/* Determine whether this date is a week day.
@return (boolean) true if a week day, false if not */
weekDay: function() {
return this._calendar.weekDay(this);
},
/* Retrieve additional information about this date.
@return (object) additional information - contents depends on calendar */
extraInfo: function() {
return this._calendar.extraInfo(this);
},
/* Add period(s) to a date.
@param offset (number) the number of periods to adjust by
@param period (string) one of 'y' for year, 'm' for month, 'w' for week, 'd' for day
@return (CDate) the updated date */
add: function(offset, period) {
return this._calendar.add(this, offset, period);
},
/* Set a portion of the date.
@param value (number) the new value for the period
@param period (string) one of 'y' for year, 'm' for month, 'd' for day
@return (CDate) the updated date
@throws error if not a valid date */
set: function(value, period) {
return this._calendar.set(this, value, period);
},
/* Compare this date to another date.
@param date (CDate) the other date
@return (number) -1 if this date is before the other date,
0 if they are equal, or +1 if this date is after the other date */
compareTo: function(date) {
if (this._calendar.name != date._calendar.name) {
throw ($.calendars.local.differentCalendars || $.calendars.regional[''].differentCalendars).
replace(/\{0\}/, this._calendar.local.name).replace(/\{1\}/, date._calendar.local.name);
}
var c = (this._year != date._year ? this._year - date._year :
this._month != date._month ? this.monthOfYear() - date.monthOfYear() :
this._day - date._day);
return (c == 0 ? 0 : (c < 0 ? -1 : +1));
},
/* Retrieve the calendar backing this date.
@return (*Calendar) the calendar implementation */
calendar: function() {
return this._calendar;
},
/* Retrieve the Julian date equivalent for this date,
i.e. days since January 1, 4713 BCE Greenwich noon.
@return (number) the equivalent Julian date */
toJD: function() {
return this._calendar.toJD(this);
},
/* Create a new date from a Julian date.
@param jd (number) the Julian date to convert
@return (CDate) the equivalent date */
fromJD: function(jd) {
return this._calendar.fromJD(jd);
},
/* Convert this date to a standard (Gregorian) JavaScript Date.
@return (Date) the equivalent JavaScript date */
toJSDate: function() {
return this._calendar.toJSDate(this);
},
/* Create a new date from a standard (Gregorian) JavaScript Date.
@param jsd (Date) the JavaScript date to convert
@return (CDate) the equivalent date */
fromJSDate: function(jsd) {
return this._calendar.fromJSDate(jsd);
},
/* Convert to a string for display.
@return (string) this date as a string */
toString: function() {
return (this.year() < 0 ? '-' : '') + pad(Math.abs(this.year()), 4) +
'-' + pad(this.month(), 2) + '-' + pad(this.day(), 2);
}
});
/* Basic functionality for all calendars.
Other calendars should extend this:
OtherCalendar.prototype = new BaseCalendar; */
function BaseCalendar() {
this.shortYearCutoff = '+10';
}
$.extend(BaseCalendar.prototype, {
_validateLevel: 0, // "Stack" to turn validation on/off
/* Create a new date within this calendar - today if no parameters given.
@param year (CDate) the date to duplicate or
(number) the year for the date
@param month (number) the month for the date
@param day (number) the day for the date
@return (CDate) the new date
@throws error if not a valid date or a different calendar used */
newDate: function(year, month, day) {
if (year == null) {
return this.today();
}
if (year.year) {
this._validate(year, month, day,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
day = year.day();
month = year.month();
year = year.year();
}
return new CDate(this, year, month, day);
},
/* Create a new date for today.
@return (CDate) today's date */
today: function() {
return this.fromJSDate(new Date());
},
/* Retrieve the epoch designator for this date.
@param year (CDate) the date to examine or
(number) the year to examine
@return (string) the current epoch
@throws error if an invalid year or a different calendar used */
epoch: function(year) {
var date = this._validate(year, this.minMonth, this.minDay,
$.calendars.local.invalidYear || $.calendars.regional[''].invalidYear);
return (date.year() < 0 ? this.local.epochs[0] : this.local.epochs[1]);
},
/* Format the year, if not a simple sequential number
@param year (CDate) the date to format or
(number) the year to format
@return (string) the formatted year
@throws error if an invalid year or a different calendar used */
formatYear: function(year) {
var date = this._validate(year, this.minMonth, this.minDay,
$.calendars.local.invalidYear || $.calendars.regional[''].invalidYear);
return (date.year() < 0 ? '-' : '') + pad(Math.abs(date.year()), 4)
},
/* 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 || $.calendars.regional[''].invalidYear);
return 12;
},
/* Calculate the month's ordinal position within the year -
for those years that don't start at month 1!
@param year (CDate) the date to examine or
(number) the year to examine
@param month (number) the month to examine
@return (number) the ordinal position, starting from minMonth
@throws error if an invalid year/month or a different calendar used */
monthOfYear: function(year, month) {
var date = this._validate(year, month, this.minDay,
$.calendars.local.invalidMonth || $.calendars.regional[''].invalidMonth);
return (date.month() + this.monthsInYear(date) - this.firstMonth) %
this.monthsInYear(date) + this.minMonth;
},
/* Calculate actual month from ordinal position, starting from minMonth.
@param year (number) the year to examine
@param ord (number) the month's ordinal position
@return (number) the month's number
@throws error if an invalid year/month */
fromMonthOfYear: function(year, ord) {
var m = (ord + this.firstMonth - 2 * this.minMonth) %
this.monthsInYear(year) + this.minMonth;
this._validate(year, m, this.minDay,
$.calendars.local.invalidMonth || $.calendars.regional[''].invalidMonth);
return m;
},
/* 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 || $.calendars.regional[''].invalidYear);
return (this.leapYear(date) ? 366 : 365);
},
/* Retrieve the day of the year for a date.
@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 day of the year
@throws error if an invalid date or a different calendar used */
dayOfYear: function(year, month, day) {
var date = this._validate(year, month, day,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
return date.toJD() - this.newDate(date.year(),
this.fromMonthOfYear(date.year(), this.minMonth), this.minDay).toJD() + 1;
},
/* Retrieve the number of days in a week.
@return (number) the number of days */
daysInWeek: function() {
return 7;
},
/* Retrieve the day of the week 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 day of the week: 0 to number of days - 1
@throws error if an invalid date or a different calendar used */
dayOfWeek: function(year, month, day) {
var date = this._validate(year, month, day,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
return (Math.floor(this.toJD(date)) + 2) % this.daysInWeek();
},
/* Retrieve additional information about 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 (object) additional information - contents depends on calendar
@throws error if an invalid date or a different calendar used */
extraInfo: function(year, month, day) {
this._validate(year, month, day,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
return {};
},
/* Add period(s) to a date.
Cater for no year zero.
@param date (CDate) the starting date
@param offset (number) the number of periods to adjust by
@param period (string) one of 'y' for year, 'm' for month, 'w' for week, 'd' for day
@return (CDate) the updated date
@throws error if a different calendar used */
add: function(date, offset, period) {
this._validate(date, this.minMonth, this.minDay,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
return this._correctAdd(date, this._add(date, offset, period), offset, period);
},
/* Add period(s) to a date.
@param date (CDate) the starting date
@param offset (number) the number of periods to adjust by
@param period (string) one of 'y' for year, 'm' for month, 'w' for week, 'd' for day
@return (CDate) the updated date */
_add: function(date, offset, period) {
this._validateLevel++;
if (period == 'd' || period == 'w') {
var jd = date.toJD() + offset * (period == 'w' ? this.daysInWeek() : 1);
var d = date.calendar().fromJD(jd);
this._validateLevel--;
return [d.year(), d.month(), d.day()];
}
try {
var y = date.year() + (period == 'y' ? offset : 0);
var m = date.monthOfYear() + (period == 'm' ? offset : 0);
var d = date.day();// + (period == 'd' ? offset : 0) +
//(period == 'w' ? offset * this.daysInWeek() : 0);
var resyncYearMonth = function(calendar) {
while (m < calendar.minMonth) {
y--;
m += calendar.monthsInYear(y);
}
var yearMonths = calendar.monthsInYear(y);
while (m > yearMonths - 1 + calendar.minMonth) {
y++;
m -= yearMonths;
yearMonths = calendar.monthsInYear(y);
}
};
if (period == 'y') {
if (date.month() != this.fromMonthOfYear(y, m)) { // Hebrew
m = this.newDate(y, date.month(), this.minDay).monthOfYear();
}
m = Math.min(m, this.monthsInYear(y));
d = Math.min(d, this.daysInMonth(y, this.fromMonthOfYear(y, m)));
}
else if (period == 'm') {
resyncYearMonth(this);
d = Math.min(d, this.daysInMonth(y, this.fromMonthOfYear(y, m)));
}
var ymd = [y, this.fromMonthOfYear(y, m), d];
this._validateLevel--;
return ymd;
}
catch (e) {
this._validateLevel--;
throw e;
}
},
/* Correct a candidate date after adding period(s) to a date.
Handle no year zero if necessary.
@param date (CDate) the starting date
@param ymd (number[3]) the added date
@param offset (number) the number of periods to adjust by
@param period (string) one of 'y' for year, 'm' for month, 'w' for week, 'd' for day
@return (CDate) the updated date */
_correctAdd: function(date, ymd, offset, period) {
if (!this.hasYearZero && (period == 'y' || period == 'm')) {
if (ymd[0] == 0 || // In year zero
(date.year() > 0) != (ymd[0] > 0)) { // Crossed year zero
var adj = {y: [1, 1, 'y'], m: [1, this.monthsInYear(-1), 'm'],
w: [this.daysInWeek(), this.daysInYear(-1), 'd'],
d: [1, this.daysInYear(-1), 'd']}[period];
var dir = (offset < 0 ? -1 : +1);
ymd = this._add(date, offset * adj[0] + dir * adj[1], adj[2]);
}
}
return date.date(ymd[0], ymd[1], ymd[2]);
},
/* Set a portion of the date.
@param date (CDate) the starting date
@param value (number) the new value for the period
@param period (string) one of 'y' for year, 'm' for month, 'd' for day
@return (CDate) the updated date
@throws error if an invalid date or a different calendar used */
set: function(date, value, period) {
this._validate(date, this.minMonth, this.minDay,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
var y = (period == 'y' ? value : date.year());
var m = (period == 'm' ? value : date.month());
var d = (period == 'd' ? value : date.day());
if (period == 'y' || period == 'm') {
d = Math.min(d, this.daysInMonth(y, m));
}
return date.date(y, m, d);
},
/* Determine whether a date is valid for this calendar.
@param year (number) the year to examine
@param month (number) the month to examine
@param day (number) the day to examine
@return (boolean) true if a valid date, false if not */
isValid: function(year, month, day) {
this._validateLevel++;
var valid = (this.hasYearZero || year != 0);
if (valid) {
var date = this.newDate(year, month, this.minDay);
valid = (month >= this.minMonth && month - this.minMonth < this.monthsInYear(date)) &&
(day >= this.minDay && day - this.minDay < this.daysInMonth(date));
}
this._validateLevel--;
return valid;
},
/* Convert the date to a standard (Gregorian) JavaScript Date.
@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 (Date) the equivalent JavaScript date
@throws error if an invalid date or a different calendar used */
toJSDate: function(year, month, day) {
var date = this._validate(year, month, day,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
return $.calendars.instance().fromJD(this.toJD(date)).toJSDate();
},
/* Convert the date from a standard (Gregorian) JavaScript Date.
@param jsd (Date) the JavaScript date
@return (CDate) the equivalent DateUtils date */
fromJSDate: function(jsd) {
return this.fromJD($.calendars.instance().fromJSDate(jsd).toJD());
},
/* Check that a candidate date is from the same calendar and is valid.
@param year (CDate) the date to validate or
(number) the year to validate
@param month (number) the month to validate
@param day (number) the day to validate
@param error (string) error message if invalid
@throws error if different calendars used or invalid date */
_validate: function(year, month, day, error) {
if (year.year) {
if (this._validateLevel == 0 && this.name != year.calendar().name) {
throw ($.calendars.local.differentCalendars || $.calendars.regional[''].differentCalendars).
replace(/\{0\}/, this.local.name).replace(/\{1\}/, year.calendar().local.name);
}
return year;
}
try {
this._validateLevel++;
if (this._validateLevel == 1 && !this.isValid(year, month, day)) {
throw error.replace(/\{0\}/, this.local.name);
}
var date = this.newDate(year, month, day);
this._validateLevel--;
return date;
}
catch (e) {
this._validateLevel--;
throw e;
}
}
});
/* Implementation of the Proleptic Gregorian Calendar.
See http://en.wikipedia.org/wiki/Gregorian_calendar
and http://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar.
@param language (string) the language code (default English) for localisation (optional) */
function GregorianCalendar(language) {
this.local = this.regional[language || ''] || this.regional[''];
}
GregorianCalendar.prototype = new BaseCalendar;
$.extend(GregorianCalendar.prototype, {
name: 'Gregorian', // The calendar name
jdEpoch: 1721425.5, // Julian date of start of Gregorian epoch: 1 January 0001 CE
daysPerMonth: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], // 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: 1, // The first month in the year
minDay: 1, // The minimum day number
regional: { // Localisations
'': {
name: 'Gregorian', // The calendar name
epochs: ['BCE', 'CE'],
monthNames: ['January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'],
monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
dayNamesMin: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
dateFormat: 'mm/dd/yyyy', // See format options on parseDate
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
}
},
/* 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 || $.calendars.regional[''].invalidYear);
var year = date.year() + (date.year() < 0 ? 1 : 0); // No year zero
return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
},
/* Determine the week of the year for a date - ISO 8601.
@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 Thursday of this week starting on Monday
var checkDate = this.newDate(year, month, day);
checkDate.add(4 - (checkDate.dayOfWeek() || 7), 'd');
return Math.floor((checkDate.dayOfYear() - 1) / 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) {
var date = this._validate(year, month, this.minDay,
$.calendars.local.invalidMonth || $.calendars.regional[''].invalidMonth);
return this.daysPerMonth[date.month() - 1] +
(date.month() == 2 && this.leapYear(date.year()) ? 1 : 0);
},
/* 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) || 7) < 6;
},
/* 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 || $.calendars.regional[''].invalidDate);
year = date.year();
month = date.month();
day = date.day();
if (year < 0) { year++; } // No year zero
// Jean Meeus algorithm, "Astronomical Algorithms", 1991
if (month < 3) {
month += 12;
year--;
}
var a = Math.floor(year / 100);
var b = 2 - a + Math.floor(a / 4);
return Math.floor(365.25 * (year + 4716)) +
Math.floor(30.6001 * (month + 1)) + day + b - 1524.5;
},
/* Create a new date from a Julian date.
@param jd (number) the Julian date to convert
@return (CDate) the equivalent date */
fromJD: function(jd) {
// Jean Meeus algorithm, "Astronomical Algorithms", 1991
var z = Math.floor(jd + 0.5);
var a = Math.floor((z - 1867216.25) / 36524.25);
a = z + 1 + a - Math.floor(a / 4);
var b = a + 1524;
var c = Math.floor((b - 122.1) / 365.25);
var d = Math.floor(365.25 * c);
var e = Math.floor((b - d) / 30.6001);
var day = b - d - Math.floor(e * 30.6001);
var month = e - (e > 13.5 ? 13 : 1);
var year = c - (month > 2.5 ? 4716 : 4715);
if (year <= 0) { year--; } // No year zero
return this.newDate(year, month, day);
},
/* Convert this date to a standard (Gregorian) JavaScript Date.
@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 (Date) the equivalent JavaScript date
@throws error if an invalid date or a different calendar used */
toJSDate: function(year, month, day) {
var date = this._validate(year, month, day,
$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
var jsd = new Date(date.year(), date.month() - 1, date.day());
jsd.setHours(0);
jsd.setMinutes(0);
jsd.setSeconds(0);
jsd.setMilliseconds(0);
// Hours may be non-zero on daylight saving cut-over:
// > 12 when midnight changeover, but then cannot generate
// midnight datetime, so jump to 1AM, otherwise reset.
jsd.setHours(jsd.getHours() > 12 ? jsd.getHours() + 2 : 0);
return jsd;
},
/* Create a new date from a standard (Gregorian) JavaScript Date.
@param jsd (Date) the JavaScript date to convert
@return (CDate) the equivalent date */
fromJSDate: function(jsd) {
return this.newDate(jsd.getFullYear(), jsd.getMonth() + 1, jsd.getDate());
}
});
// Singleton manager
$.calendars = new Calendars();
// Date template
$.calendars.cdate = CDate;
// Base calendar template
$.calendars.baseCalendar = BaseCalendar;
// Gregorian calendar implementation
$.calendars.calendars.gregorian = GregorianCalendar;
})(jQuery);