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calendar.js
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calendar.js
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/**
* @name CeL function for calendrical calculations.
*
* If you need a online demo of these calendars, please visit:
* http://lyrics.meicho.com.tw/lib/JS/_test%20suite/era.htm
*
* @fileoverview
* 本檔案包含了曆法轉換的功能。
*
* @since 2014/4/12 15:37:56
*/
// https://www.funaba.org/cc
// http://www.fourmilab.ch/documents/calendar/
// http://the-light.com/cal/converter/
// http://keith-wood.name/calendars.html
// http://www.cc.kyoto-su.ac.jp/~yanom/pancanga/index.html
/*
TODO:
https://en.wikipedia.org/wiki/Vikram_Samvat
the official calendar of Nepal
*/
'use strict';
if (typeof CeL === 'function')
CeL.run(
{
name : 'data.date.calendar',
// |application.astronomy.
// data.math.find_root
require : 'data.code.compatibility.|data.native.set_bind|data.date.String_to_Date|data.date.is_leap_year|data.date.Julian_day|data.math.',
code : function(library_namespace) {
// requiring
var set_bind = this.r('set_bind'), String_to_Date = this.r('String_to_Date'), is_leap_year = this.r('is_leap_year'), Julian_day = this.r('Julian_day');
/**
* null module constructor
* @class calendars 的 functions
*/
var _// JSDT:_module_
= function() {
// null module constructor
};
/**
* for JSDT: 有 prototype 才會將之當作 Class
*/
_// JSDT:_module_
.prototype = {
};
//----------------------------------------------------------------------------------------------------------------------------------------------------------//
// 工具函數。
var
// copy from data.date.
/** {Number}一整天的 time 值。should be 24 * 60 * 60 * 1000 = 86400000. */
ONE_DAY_LENGTH_VALUE = new Date(0, 0, 2) - new Date(0, 0, 1);
var
// 24 hours
ONE_DAY_HOURS = (new Date(1, 1, 1, -1)).getHours() | 0,
// set weekday name converter.
KEY_WEEK = 'week';
function _Date(year, month, date) {
if (year < 100) {
// 僅使用 new Date(0) 的話,會含入 timezone offset (.getTimezoneOffset)。
// 因此得使用 new Date(0, 0)。
var d = new Date(0, 0);
d.setFullYear(year, month, date);
return d;
}
return new Date(year, month, date);
}
function _time(year, month, date, hour) {
if (year < 100) {
// 僅使用 new Date(0) 的話,會含入 timezone offset (.getTimezoneOffset)。
// 因此得使用 new Date(0, 0)。
var d = new Date(0, 0);
d.setFullYear(year, month, date, hour);
return d;
}
return new Date(year, month, date, hour);
}
/**
* format 回傳處理。
*
* <code>
* API:
Date_to_Calendar({Date}, {Object}options)
options.format = 'serial':
return 數字序號 (numerical serial №) [ {Integer}year, {Natural}month, {Natural}date ]
options.format = 'item':
一般會:
return [ {Integer}year, {String}month name, {Natural}date ]
return [ {Integer}year, {String}month name, {Natural}date, {小數}餘下不到一日之時間值 remainder (單位:日) ]
options.format = 'text':
return {String} 當地語言之表現法。常是 "weekday, date month year"。
others:
default: text
* </code>
*
* @param {Array}date [
* {Integer}year, {Natural}month, {Natural}date ],<br />
* date[KEY_WEEK] = {Integer}weekday
* @param {Object}[options]
* options that called
* @param {Array|Function}to_name [
* {Function}year serial to name, {Function}month serial to name,
* {Function}date serial to name, {Function}weekday serial to name ]
* @returns
*/
function _format(date, options, to_name, is_leap, combine) {
var format = options && options.format;
if (format === 'serial')
return date;
if (typeof to_name === 'function')
// 當作 month_to_name。
date[1] = to_name(date[1], is_leap, options);
else if (Array.isArray(to_name))
to_name.forEach(function(func, index) {
date[ index === 3 ? KEY_WEEK : index ]
//
= func(date[index], is_leap, index);
});
else
library_namespace.warn('_format: 無法辨識之 to_name: ' + to_name);
if (format === 'item')
return date;
if (options && typeof options.numeral === 'function') {
date[0] = options.numeral(date[0]);
date[2] = options.numeral(date[2]);
}
if (typeof combine === 'function') {
format = combine(date);
} else {
format = date.slice(0, 3);
// direction
if (combine !== true)
format = format.reverse();
format = format.join(' ');
}
if (options) {
if (options.postfix)
format += options.postfix;
if (options.prefix)
format = options.prefix + format;
}
// add weekday name
if (date[KEY_WEEK])
format = date[KEY_WEEK] + ', ' + format;
return format;
}
/**
* 創建測試器。<br />
* test: 經過正反轉換運算,應該回到相同的日子。
*
* @param {Function}to_Calendar
* @param {Function}to_Date
* @param {Object}[options]
*
* @returns {Function}測試器。
*/
function new_tester(to_Calendar, to_Date, options) {
options = Object.assign(Object.create(null),
new_tester.default_options, options || {});
var epoch = (options.epoch || to_Date.epoch) - 0 || 0,
//
month_days = options.month_days, CE_format = options.CE_format,
//
continued_month = options.continued_month,
//
get_month_serial = options.month_serial;
return function(begin_Date, end_Date, error_limit) {
begin_Date = typeof begin_Date === 'number' ? epoch + (begin_Date | 0)
* ONE_DAY_LENGTH_VALUE : begin_Date - 0;
var tmp = typeof end_Date === 'string'
&& end_Date.trim().match(/^\+(\d+)$/);
end_Date = tmp || typeof end_Date === 'number' ? (tmp ? begin_Date
: epoch)
+ end_Date * ONE_DAY_LENGTH_VALUE : end_Date - 0;
if (isNaN(begin_Date) || isNaN(end_Date))
return;
var begin = Date.now(), last_show = begin, date_name, old_date_name, error = [];
if (!(0 < error_limit && error_limit < 1e9))
error_limit = new_tester.default_options.error_limit;
for (; begin_Date <= end_Date && error.length < error_limit; begin_Date += ONE_DAY_LENGTH_VALUE) {
// 正解: Date → calendar date
date_name = to_Calendar(new Date(begin_Date), options);
if (old_date_name
//
&& (date_name[2] - old_date_name[2] !== 1 || old_date_name[1] !== date_name[1])) {
if (date_name[0] !== old_date_name[0]
// 每世紀記錄一次使用時間。
&& date_name[0] % 100 === 0 && Date.now() - last_show > 20000) {
console.log((begin_Date - epoch) / ONE_DAY_LENGTH_VALUE
+ ' days: ' + date_name.join() + ' ('
+ (new Date(begin_Date)).format(CE_format) + ')'
+ ', 使用時間 ' + ((last_show = Date.now()) - begin)
+ ' ms.');
}
// 確定 old_date_name 的下一個天為 date_name。
// 月差距
tmp = get_month_serial(date_name)
- get_month_serial(old_date_name);
if (date_name[2] - old_date_name[2] === 1)
tmp = tmp !== 0
&& !continued_month(date_name[1], old_date_name[1])
&& '隔日(日期名接續),但月 serial 差距 !== 0';
else if (date_name[2] !== 1)
tmp = '日期名未接續: 隔月/隔年,但日期非以 1 起始';
else if (!(old_date_name[2] in month_days))
tmp = '日期名未接續: 前一月末日數 ' + old_date_name[2]
+ '未設定於 month_days 中';
else if (tmp !== 1 && (tmp !== 0
// 這邊不再檢查年份是否差一,因為可能是閏月。
// || date_name[0] - old_date_name[0] !== 1
) && !continued_month(date_name[1], old_date_name[1]))
tmp = '月名未接續 (' + old_date_name[1] + '→' + date_name[1]
+ ': 相差' + tmp + ')';
else if (date_name[2] === old_date_name[2])
tmp = '前後日期名相同';
else if (date_name[0] !== old_date_name[0]
&& date_name[0] - old_date_name[0] !== 1
// Skip last day of -1 → first day of 1
&& date_name[0] !== 1 && old_date_name[0] !== -1)
tmp = '前後年份不同: ' + old_date_name[0] + '→' + date_name[0];
else
// 若 OK,必得設定 tmp!
tmp = false;
if (tmp) {
error.push(tmp + ': 前一天 ' + old_date_name.join('/')
+ ' ⇨ 隔天 ' + date_name.join('/') + ' ('
+ (new Date(begin_Date)).format(CE_format) + ', '
+ begin_Date + ')');
}
}
old_date_name = date_name;
// 反解: calendar date → Date
tmp = to_Date(date_name[0], date_name[1], date_name[2]);
if (begin_Date - tmp !== 0) {
tmp = '正反解到了不同日期: ' + (new Date(begin_Date)).format(CE_format)
+ ', ' + (begin_Date - epoch) / ONE_DAY_LENGTH_VALUE
+ ' days → ' + date_name.join(',') + ' → '
+ (tmp ? tmp.format(CE_format) : tmp);
error.push(tmp);
if (error.length < 9)
console.error(tmp);
}
}
library_namespace.info((new Date - begin) + ' ms, error '
+ error.length + '/' + error_limit);
if (true || error.length)
return error;
};
}
new_tester.default_options = {
// length of the months
month_days : {
29 : '陰陽曆大月',
30 : '陰陽曆小月'
},
CE_format : {
parser : 'CE',
format : '%Y/%m/%d %HH CE'
},
// 延續的月序,月序未中斷。continued/non-interrupted month serial.
continued_month : function(month, old_month) {
return month === 1 && (old_month === 12 || old_month === 13);
},
// get month serial
// 其他方法: 見 Hindu_Date.test
month_serial : function(date_name) {
var month = date_name[1];
if (isNaN(month)) {
var matched = month.match(/^\D?(\d{1,2})$/);
if (!matched)
throw 'tester: Illegal month name: ' + month;
month = matched[1] | 0;
}
return month;
},
// get 數字序號 (numerical serial).
format : 'serial',
error_limit : 20
};
function continued_month_中曆(month, old_month) {
var matched;
if (typeof old_month === 'string')
return (matched = old_month.match(/^閏(\d{1,2})$/))
&& (matched[1] - month === 1 || month === 1 && matched[1] == 12);
if (typeof month === 'string')
return (matched = month.match(/^閏(\d{1,2})$/))
&& (matched[1] - old_month === 0 || matched[1] == 1
&& old_month === 12);
return month === 1 && old_month === 12;
}
/**
* 提供 to calendar date 之 front-end (wrapper)
*
* @param {Function}calendar_Date
* to calendar date
* @param {Function}[new_year_Date]
* to calendar new year's day
*
* @returns {Function} parser
*/
function _parser(calendar_Date, new_year_Date) {
return function(date, minute_offset, options) {
var period_end = options && options.period_end;
if (!isNaN(date)) {
if (new_year_Date)
// use the new year's day
return new_year_Date(date);
// use year/1/1
// String → Number
date |= 0;
return calendar_Date(period_end ? 1 + date : date, 1, 1);
}
if (date = date.match(/(-?\d{1,4})[\/\-](\d{1,2})(?:[\/\-](\d{1,2}))?/)) {
if (period_end)
date[date[3] ? 3 : 2]++;
return calendar_Date(date[1] | 0, date[2] | 0, date[3] && (date[3] | 0) || 1);
}
};
}
//----------------------------------------------------------------------------------------------------------------------------------------------------------//
// 長曆: 伊斯蘭曆
// گاهشماری هجری قمری
// https://fa.wikipedia.org/wiki/%DA%AF%D8%A7%D9%87%E2%80%8C%D8%B4%D9%85%D8%A7%D8%B1%DB%8C_%D9%87%D8%AC%D8%B1%DB%8C_%D9%82%D9%85%D8%B1%DB%8C
// تقويم هجري
// https://ar.wikipedia.org/wiki/%D8%AA%D9%82%D9%88%D9%8A%D9%85_%D9%87%D8%AC%D8%B1%D9%8A
// Tabular Islamic calendar / lunar Hijri calendar (AH, A.H. = anno hegirae), lunar Hejrī calendar / التقويم الهجري المجدول /
// http://en.wikipedia.org/wiki/Tabular_Islamic_calendar
// 伊斯蘭曆(回回曆)
// 陳垣編的《中西回史日曆》(中華書局1962年修訂重印)。
// 陈氏中西回史日历冬至订误,鲁实先
// There are 11 leap years in a 30 year cycle.
var Tabular_cycle_years = 30 | 0, Tabular_half_cycle = 15 | 0,
// 平年日數。6=(12個月 / 2)
// 每年有12個月。奇數個月有30天,偶數個月有29天,除第12/最後一個月在閏年有30天。
Tabular_common_year_days = (30 + 29) * 6 | 0,
// 每一30年周期內設11閏年。
Tabular_leaps_in_cycle = 11 | 0,
//
Tabular_cycle_days = Tabular_common_year_days * Tabular_cycle_years
+ Tabular_leaps_in_cycle,
// Tabular_leap_count[shift + Tabular_cycle_years]
// = new Array( 30 : [ 各年於30年周期內已累積 intercalary days ] )
Tabular_leap_count = [],
// 各月1日累積日數。
// = [0, 30, 30+29, 30+29+30, ..]
// Tabular_month_days.length = 12
Tabular_month_days = [ 0 ];
(function() {
for (var month = 0, count = 0; month < 12;)
Tabular_month_days.push(count += (month++ % 2 === 0 ? 30 : 29));
// assert: Tabular_common_year_days === Tabular_month_days.pop();
})();
function Tabular_list_leap() {
for (var s = -Tabular_cycle_years; s <= Tabular_cycle_years; s++) {
for (var year = 1, shift = s, leap = []; year <= Tabular_cycle_years; year++)
if ((shift += Tabular_leaps_in_cycle) > Tabular_half_cycle)
shift -= Tabular_cycle_years, leap.push(year);
library_namespace.log(s + ': ' + leap);
}
}
// 0: 2,5,7,10,13,16,18,21,24,26,29
// -3: 2,5,8,10,13,16,19,21,24,27,29
// 1: 2,5,7,10,13,15,18,21,24,26,29
// -5: 2,5,8,11,13,16,19,21,24,27,30
// shift: 小餘, -30–30.
function get_Tabular_leap_count(shift, year_serial) {
if (0 < (shift |= 0))
shift %= Tabular_cycle_years;
else
shift = 0;
// + Tabular_cycle_years: 預防有負數。
if (!((shift + Tabular_cycle_years) in Tabular_leap_count))
// 計算各年於30年周期內已累積 intercalary days。
for (var year = 0, count = 0,
// new Array(Tabular_cycle_years)
intercalary_days_count = Tabular_leap_count[shift + Tabular_cycle_years] = [ 0 ];
//
year < Tabular_cycle_years; year++) {
if ((shift += Tabular_leaps_in_cycle) > Tabular_half_cycle)
shift -= Tabular_cycle_years, count++;
intercalary_days_count.push(count);
}
return Tabular_leap_count[shift + Tabular_cycle_years][year_serial];
}
// Tabular date to Date.
function Tabular_Date(year, month, date, shift) {
return new Date(Tabular_Date.epoch +
// 計算距離 Tabular_Date.epoch 日數。
(Math.floor((year = year < 0 ? year | 0 : year > 0 ? year - 1 : 0)
// ↑ No year 0.
/ Tabular_cycle_years) * Tabular_cycle_days
// 添上閏年數。
+ get_Tabular_leap_count(shift,
// 確認 year >=0。
(year %= Tabular_cycle_years) < 0 ? (year += Tabular_cycle_years) : year)
// 添上整年之日數。
+ year * Tabular_common_year_days
// 添上整月之日數。
+ Tabular_month_days[(month || 1) - 1]
// 添上月初至 date 日數。
+ (date || 1) - 1) * ONE_DAY_LENGTH_VALUE);
}
// 622/7/15 18:0 Tabular begin offset
// 伊斯蘭曆每日以日落時分日。例如 AH 1/1/1 可與公元 622/7/16 互換,
// 但 AH 1/1/1 事實上是從 622/7/15 的日落時算起,一直到 622/7/16 的日落前為止。
// '622/7/16'.to_Date('CE').format(): '622/7/19' === new Date(622, 7 - 1, 19)
Tabular_Date.epoch = String_to_Date('622/7/16', {
parser : 'CE'
}).getTime();
var Tabular_month_name_of_serial = '|محرم|صفر|ربيع الأول|ربيع الثاني|جمادى الأول|جمادى الآخر|رجب |شعبان|رمضان|شوال|ذو القعدة|ذو الحجة'.split('|');
Tabular_Date.month_name = function(month_serial) {
return Tabular_month_name_of_serial[month_serial];
};
Tabular_Date.is_leap = function(year, shift) {
// 轉正。保證變數值非負數。
if ((year %= Tabular_cycle_years) < 1)
year += Tabular_cycle_years;
return get_Tabular_leap_count(shift, year)
- get_Tabular_leap_count(shift, year - 1);
};
// 有更快的方法。
function Date_to_Tabular(date, options) {
var month,
// 距離 Tabular_Date.epoch 的日數。
tmp = (date - Tabular_Date.epoch) / ONE_DAY_LENGTH_VALUE,
//
delta = tmp - (date = Math.floor(tmp)),
// 距離 Tabular_Date.epoch 的30年周期之年數。
year = Math.floor(date / Tabular_cycle_days) * Tabular_cycle_years;
// 本30年周期內之日數。
date %= Tabular_cycle_days;
// 保證 date >=0。
if (date < 0)
date += Tabular_cycle_days;
// month: 本30年周期內之積年數: 0–30。
// 30: 第29年年底。
month = (date / Tabular_common_year_days) | 0;
year += month;
date %= Tabular_common_year_days;
// 不動到原 options。
options = Object.assign({
postfix:' هـ'
},options);
// 求出為本年第幾天之序數。
// 減去累積到第 month 年首日,應該有幾個閏日。
tmp = get_Tabular_leap_count(options.shift, month);
if (date < tmp)
// 退位。
year--, date += Tabular_common_year_days
//
- get_Tabular_leap_count(options.shift, month - 1);
else
date -= tmp;
// 至此確定年序數與求出本年第幾天之序數。
// 這邊的計算法為 Tabular Islamic calendar 特殊設計過,並不普適。
// 理據: 每月日數 >=29 && 末月累積日數 - 29*月數 < 29 (不會 overflow)
// tmp 可能是本月,或是下月累積日數。
tmp = Tabular_month_days[month = (date / 29) | 0];
if (date < tmp
// assert: month === 12: 年內最後一天。
|| month === 12)
// tmp 是下月累積日數。
tmp = Tabular_month_days[--month];
// 本月日數。
date -= tmp;
// 日期序數→日期名。year/month/date index to serial.
// There is no year 0.
if (year >= 0)
year++;
// [ year, month, date, 餘下時間值(單位:日) ]
return _format([ year, month + 1, date + 1, delta ], options,
Tabular_Date.month_name);
}
/*
CeL.run('data.date.calendar');
CeL.Tabular_Date.test(-2e4, 4e6, 4).join('\n') || 'OK';
// "OK"
'624/6/23'.to_Date('CE').to_Tabular({format : 'serial'})
// [2, 12, 30, 0]
CeL.Tabular_Date(3, 7, 1).format('CE')
*/
Tabular_Date.test = new_tester(Date_to_Tabular, Tabular_Date);
_.Tabular_Date = Tabular_Date;
//----------------------------------------------------------------------------------------------------------------------------------------------------------//
// 長曆: הַלּוּחַ הָעִבְרִי / Hebrew calendar / Jewish Calendar / 希伯來曆 / 猶太曆計算
// https://en.wikipedia.org/wiki/Hebrew_calendar
// http://www.stevemorse.org/jcal/rules.htm
// http://www.jewishgen.org/infofiles/m_calint.htm
// Hebrew_month_serial[month_name] = month serial (1–12 or 13)
var Hebrew_month_serial = Object.create(null),
// Hour is divided into 1080 parts called haliq (singular of halaqim)
Hebrew_1_HOUR = 1080 | 0,
// hour length in halaqim
Hebrew_1_DAY = 24 * Hebrew_1_HOUR | 0,
// month length in halaqim
// The Jewish month is defined to be 29 days, 12 hours, 793 halaqim.
Hebrew_1_MONTH = 29 * Hebrew_1_DAY + 12 * Hebrew_1_HOUR + 793 | 0,
// Metonic cycle length in halaqim
// Metonic cycle = 235 months (about 19 years): Hebrew calendar 採十九年七閏法
//Hebrew_1_cycle = (19 * 12 + 7) * Hebrew_1_MONTH | 0,
ONE_HOUR_LENGTH_VALUE = Date.parse('1/1/1 2:0') - Date.parse('1/1/1 1:0'),
// 1 hour of Date / 1 hour of halaqim (Hebrew calendar).
// (length of halaqim) * halaqim_to_Date_ratio = length value of Date
halaqim_to_Date_ratio = ONE_HOUR_LENGTH_VALUE / Hebrew_1_HOUR,
// http://www.stevemorse.org/jcal/rules.htm
// Molad of Tishri in year 1 occurred on Monday at 5hr, 204hq (5hr, 11mn, 20 sc)
// i.e., evening before Monday daytime at 11 min and 20 sec after 11 PM
Hebrew_epoch_halaqim = 5 * Hebrew_1_HOUR + 204 | 0,
// https://en.wikipedia.org/wiki/Molad
// The traditional epoch of the cycle was 5 hours 11 minutes and 20 seconds
// after the mean sunset (considered to be 6 hours before midnight) at the epoch
// of the Hebrew calendar (first eve of Tishrei of Hebrew year 1).
Hebrew_epoch_shift_halaqim = -6 * Hebrew_1_HOUR | 0,
// for reduce error.
Hebrew_epoch_shift = Math.round(Hebrew_epoch_shift_halaqim
* halaqim_to_Date_ratio),
// 1/Tishri/1: Julian -3761/10/7
//
// https://en.wikipedia.org/wiki/Hebrew_calendar
// The Jewish calendar's epoch (reference date), 1 Tishrei AM 1, is equivalent
// to Monday, 7 October 3761 BC/BCE in the proleptic Julian calendar, the
// equivalent tabular date (same daylight period) and is about one year before
// the traditional Jewish date of Creation on 25 Elul AM 1, based upon the Seder
// Olam Rabbah.
//
// http://www.stevemorse.org/jcal/jcal.html
// http://www.fourmilab.ch/documents/calendar/
Hebrew_epoch = String_to_Date('-3761/10/7', {
parser : 'Julian'
}).getTime();
// ---------------------------------------------------------------------------//
// Hebrew to Date
// Hebrew year, month, date
// get_days: get days of year
function Hebrew_Date(year, month, date, get_days) {
// no year 0. year: -1 → 0
if (year < 0 && !Hebrew_Date.year_0)
year++;
var is_leap = Hebrew_Date.is_leap(year),
//
days = isNaN(date) ? 0 : date - 1 | 0,
// days diff (year type)
// add_days = -1 (defective) / 0 (normal) / 1 (complete)
add_days = Hebrew_Date.days_of_year(year) - 354 | 0;
if (add_days > 1)
add_days -= 30;
if (!month)
// month index 0
month = 0;
else if (isNaN(month = Hebrew_Date.month_index(month, is_leap)))
return;
// month: month index (0–11 or 12)
if (month > 2 || month === 2 && add_days > 0) {
// 所有後面的月份皆須加上此 add_days。
days += add_days;
if (is_leap && month > 5)
// subtract the 30 days of leap month Adar I.
month--, days += 30;
}
days += (month >> 1) * (30 + 29);
if (month % 2 === 1)
days += 30;
// days: days from new year day
return get_days ? days : Hebrew_Date.new_year_days(year, days, true);
}
// Are there year 0?
// 警告:除了 Hebrew_Date(), Date_to_Hebrew() 之外,其他函數皆假定有 year 0!
Hebrew_Date.year_0 = false;
//---------------------------------------------------------------------------//
// tools for month name
// https://en.wikipedia.org/wiki/Hebrew_Academy
// Academy name of specified month serial.
// common year: Nisan: 1, Iyyar: 2, .. Adar: 12
// leap year: Nisan: 1, Iyyar: 2, .. (Adar I): 12, (Adar II/Adar/Ve'Adar): 13
// Tishri: 下半年的開始。 http://en.wikipedia.org/wiki/Babylonian_calendar
(Hebrew_Date.month_name_of_serial = "|Nisan|Iyyar|Sivan|Tammuz|Av|Elul|Tishri|Marẖeshvan|Kislev|Tevet|Shvat|Adar"
.split('|'))
//
.forEach(function(month_name, month_serial) {
if (month_serial > 0)
Hebrew_month_serial[month_name.toLowerCase()] = month_serial;
});
// other common names.
// all should be in lower case!
Object.assign(Hebrew_month_serial, {
nissan : 1,
iyar : 2,
siwan : 3,
tamuz : 4,
ab : 5,
tishrei : 7,
heshvan : 8,
marcheshvan : 8,
cheshvan : 8,
'marẖeshwan' : 8,
chisleu : 9,
chislev : 9,
tebeth : 10,
shevat : 11,
shebat : 11,
sebat : 11,
// 'adar 1':12,
// 'adar 2':12,
// Occasionally instead of Adar I and Adar II, "Adar" and "Ve'Adar" are used
// (Ve means 'and' thus: And Adar).
veadar : 13,
"ve'adar" : 13
});
// return Academy name of specified month serial.
// common year: 1: Nisan, 2: Iyyar, .. 12: Adar
// leap year: 1: Nisan, 2: Iyyar, .. 12: Adar, 13: Adar II
Hebrew_Date.month_name = function(month_serial, is_leap_year) {
if (month_serial >= 12 && (month_serial === 13 || is_leap_year))
return month_serial === 12 ? 'Adar I' : 'Adar II';
return Hebrew_Date.month_name_of_serial[month_serial];
};
// return month serial.
// common year: Nisan: 1, Iyyar: 2, .. Adar: 12
// leap year: Nisan: 1, Iyyar: 2, .. (Adar I): 12, (Adar II/Adar/Ve'Adar): 13
Hebrew_Date.month_serial = function(month_name, is_leap_year) {
if (typeof month_name === 'string') {
// normalize month name.
month_name = month_name.trim().toLowerCase();
if (/^adar\s*[1i]$/i.test(month_name))
// Only in Leap years.
return 12;
if (/^adar\s*(2|ii)$/i.test(month_name))
// Only in Leap years.
return 13;
if (month_name === 'adar')
if (is_leap_year)
return 13;
else if (is_leap_year === undefined) {
if (library_namespace.is_debug(2))
library_namespace
.warn('May be 12, but will return 13 for Adar.');
return 13;
}
if (month_name in Hebrew_month_serial)
return Hebrew_month_serial[month_name];
}
library_namespace.error('Hebrew_Date.month_serial: Unknown month name: '
+ month_name);
return month_name;
};
// month: month name or serial
//
// return 0: Tishri, 1: Heshvan, ..
//
// common year: 0–11
// leap year: 0–12
//
// for numeral month name (i.e. month serial):
// Hebrew year begins on 7/1, then month 8, 9, .. 12, 1, 2, .. 6.
//
// common year: 7→0 (Tishri), 8→1, .. 12→5 (Adar),
// 1→6 (Nisan), 2→7, .. 6→11 (Elul)
//
// leap year: 7→0 (Tishri), 8→1, .. 12→5 (Adar I), 13→6 (Adar II),
// 1→7 (Nisan), 2→8, .. 6→12 (Elul)
Hebrew_Date.month_index = function(month, is_leap_year) {
if (isNaN(month))
// month name to serial
month = Hebrew_Date.month_serial(month, is_leap_year);
if (month === (month | 0))
if (month === 13)
// Adar II
return 6;
else if (1 <= month && month <= 12 && (month -= 7) < 0)
// leap 1→-6→7, ..
// common: 1→-6→6, ..
month += is_leap_year ? 13 : 12;
if (Number.isNaN(month))
library_namespace.error('Hebrew_Date.month_index: Unknown month: '
+ month);
return month;
};
//---------------------------------------------------------------------------//
/*
for (y = 0; y < 19; y++)
if (Hebrew_Date.is_leap(y))
console.log(y);
*/
// the years 3, 6, 8, 11, 14, 17, and 19
// are the long (13-month) years of the Metonic cycle
Hebrew_Date.is_leap = function(year) {
year = (7 * (year | 0) + 1) % 19;
// 轉正。保證變數值非負數。
if (year < 0)
year += 19;
return year < 7;
};
/*
累積 leap:
(7 * year - 6) / 19 | 0
Simplify[12*(year - 1) + (7*year - 6)/19]
1/19 (-234 + 235 year)
*/
// 累積 months of new year begins (7/1)
Hebrew_Date.month_count = function(year, month_index) {
return Math.floor((235 * year - 234 | 0) / 19) + (month_index | 0);
};
// halaqim of molad from Hebrew_epoch
// month_index 0: Tishri
// CeL.Hebrew_Date.molad(1,0,true).format('CE')==="-3761/10/6 23:11:20.000"
Hebrew_Date.molad = function(year, month_index, get_Date) {
year = Hebrew_Date.month_count(year, month_index) * Hebrew_1_MONTH
+ Hebrew_epoch_halaqim;
return get_Date ? new Date(Hebrew_epoch + Hebrew_epoch_shift + year
* halaqim_to_Date_ratio) : year;
};
// return [ week_day (0:Sunday, 1:Monday, .. 6),
// hour (0–23 from sunset 18:0 of previous day), halaqim (0–) ]
// @see
// http://www.stevemorse.org/jcal/molad.htm?year=1
Hebrew_Date.molad_date = function(year, month_index) {
var halaqim = Hebrew_Date.molad(year, month_index),
// the first day of 1/1/1 is Monday, index 1.
week_day = (Math.floor(halaqim / Hebrew_1_DAY) + 1) % 7 | 0;
// 轉正。保證變數值非負數。
if (week_day < 0)
week_day += 7;
halaqim %= Hebrew_1_DAY;
if (halaqim < 0)
halaqim += Hebrew_1_DAY;
return [ week_day, halaqim / Hebrew_1_HOUR | 0, halaqim % Hebrew_1_HOUR | 0 ];
};
// cache
var Hebrew_delay_days = [], Hebrew_new_year_days = [];
/*
test:
for (year = 0; year < 1e4; year++)
if (CeL.Hebrew_Date.delay_days(year) === 2
&& (!CeL.Hebrew_Date.delay_days(year - 1) || !CeL.Hebrew_Date
.delay_days(year + 1)))
throw year;
*/
// return 0, 1, 2
Hebrew_Date.delay_days = function(year) {
if ((year |= 0) in Hebrew_delay_days)
return Hebrew_delay_days[year];
var delay_days = Hebrew_Date.molad_date(year),
//
week_day = delay_days[0] | 0, hour = delay_days[1] | 0, halaqim = delay_days[2] | 0;
// phase 1
// http://www.stevemorse.org/jcal/rules.htm
// Computing the beginning of year (Rosh Hashanah):
if (delay_days =
// (2) If molad Tishri occurs at 18 hr (i.e., noon) or later, Tishri 1 must
// be delayed by one day.
hour >= 18
// (3) If molad Tishri in a common year falls on Tuesday at 9 hr 204 hq
// (i.e., 3:11:20 AM) or later, then Tishri 1 is delayed by one day
|| week_day === 2 && (hour > 9 || hour === 9 && halaqim >= 204)
&& !Hebrew_Date.is_leap(year)
// (4) If molad Tishri following a leap year falls on Monday at 15
// hr 589 hq (9:32:43 1/3 AM) or later, Tishri 1 is delayed by one
// day
|| week_day === 1 && (hour > 15 || hour === 15 && halaqim >= 589)
&& Hebrew_Date.is_leap(year - 1)
// default: no delayed
? 1 : 0)
week_day++;
// phase 2
// (1) If molad Tishri occurs on Sunday, Wednesday, or Friday, Tishri 1 must
// be delayed by one day
//
// since the molad Tishri of year 2 falls on a Friday, Tishri 1 of that year
// should have been delayed by rule 1 so that Yom Kippor wouldn't be on the
// day after the Sabbath. However Adam and Eve would not yet have sinned as
// of the start of that year, so there was no predetermined need for them to
// fast on that first Yom Kippor, and the delay rule would not have been
// needed. And if year 2 was not delayed, the Sunday to Friday of creation
// would not have been from 24-29 Elul but rather from 25 Elul to 1 Tishri.
// In other words, Tishri 1 in the year 2 is not the first Sabbath, but
// rather it is the day that Adam and Eve were created.
//
// http://www.stevemorse.org/jcal/jcal.js
// year 3 wants to start on Wed according to its molad, so delaying year
// 3 by the WFS rule would require too many days in year 2, therefore
// WFS must be suspended for year 3 as well
if (3 * week_day % 7 < 3 && 3 < year)
delay_days++;
return Hebrew_delay_days[year] = delay_days | 0;
};
// return days of year's first day.
Hebrew_Date.new_year_Date_original = function(year, days) {
days = new Date(Hebrew_epoch + Hebrew_Date.molad(year)
* halaqim_to_Date_ratio
+ (Hebrew_Date.delay_days(year) + (days | 0))
* ONE_DAY_LENGTH_VALUE);
// set to 0:0 of the day
days.setHours(0, 0, 0, 0);
return days;
};
// calculate days from 1/1/1.
// simplify from Hebrew_Date.new_year_Date_original()
// new_year_days(1) = 0
// new_year_days(2) = 354
// new_year_days(3) = 709
// CeL.Hebrew_Date.new_year_days(1,0,true).format('CE')
Hebrew_Date.new_year_days = function(year, days, get_Date) {
if (!(year in Hebrew_new_year_days))
Hebrew_new_year_days[year] = Math.floor(Hebrew_Date.molad(year)
/ Hebrew_1_DAY)
//
+ Hebrew_Date.delay_days(year) | 0;
year = Hebrew_new_year_days[year] + (days | 0);
return get_Date ? new Date(Hebrew_epoch + year * ONE_DAY_LENGTH_VALUE)
: year;
};
// return days of year's first day.
// Please use Hebrew_Date.new_year_days(year, days, true) instead.
if (false)
Hebrew_Date.new_year_Date = function(year, days) {
return Hebrew_Date.new_year_days(year, days, true);
};
/*
test:
for (var year = 0, d, d2; year <= 1e5; year++) {
d = CeL.Hebrew_Date.days_of_year_original(year);
d2 = CeL.Hebrew_Date.days_of_year(year);
if (d !== d2)
throw year + ': ' + d + '!==' + d2;
// common year has 353 (defective), 354 (normal), or 355 (complete) days
d -= 354;
if (d > 1)
d -= 30;
if (d !== Math.sign(d))
throw year + ': ' + d2 + ' days';
}
console.log('OK');
*/
// day count of year.
Hebrew_Date.days_of_year_original = function(year) {
// common year has 353 (defective), 354 (normal), or 355 (complete) days
// leap year has 383 (defective), 384 (normal), or 385 (complete) days
return (Hebrew_Date.new_year_Date_original(year + 1) - Hebrew_Date
.new_year_Date_original(year))
/ ONE_DAY_LENGTH_VALUE | 0;
};
// day count of year.
// days_of_year(1) = 354
// days_of_year(2) = 354
// days_of_year(3) = 384
// common year has 353 (defective), 354 (normal), or 355 (complete) days
// leap year has 383 (defective), 384 (normal), or 385 (complete) days
Hebrew_Date.days_of_year = function(year) {
return Hebrew_Date.new_year_days(year + 1)
- Hebrew_Date.new_year_days(year);
};