@ng-bootstrap/ng-bootstrap
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JavaScript
import { NgbCalendarHijri } from './ngb-calendar-hijri';
import { NgbDate } from '../ngb-date';
import { Injectable } from '@angular/core';
/**
* Checks if islamic year is a leap year
*/
function isIslamicLeapYear(hYear) {
return (14 + 11 * hYear) % 30 < 11;
}
/**
* Checks if gregorian years is a leap year
*/
function isGregorianLeapYear(gDate) {
const year = gDate.getFullYear();
return year % 4 === 0 && year % 100 !== 0 || year % 400 === 0;
}
/**
* Returns the start of Hijri Month.
* `hMonth` is 0 for Muharram, 1 for Safar, etc.
* `hYear` is any Hijri hYear.
*/
function getIslamicMonthStart(hYear, hMonth) {
return Math.ceil(29.5 * hMonth) + (hYear - 1) * 354 + Math.floor((3 + 11 * hYear) / 30.0);
}
/**
* Returns the start of Hijri year.
* `year` is any Hijri year.
*/
function getIslamicYearStart(year) {
return (year - 1) * 354 + Math.floor((3 + 11 * year) / 30.0);
}
function mod(a, b) {
return a - b * Math.floor(a / b);
}
/**
* The civil calendar is one type of Hijri calendars used in islamic countries.
* Uses a fixed cycle of alternating 29- and 30-day months,
* with a leap day added to the last month of 11 out of every 30 years.
* http://cldr.unicode.org/development/development-process/design-proposals/islamic-calendar-types
* All the calculations here are based on the equations from "Calendrical Calculations" By Edward M. Reingold, Nachum
* Dershowitz.
*/
const GREGORIAN_EPOCH = 1721425.5;
const ISLAMIC_EPOCH = 1948439.5;
export class NgbCalendarIslamicCivil extends NgbCalendarHijri {
/**
* Returns the equivalent islamic(civil) date value for a give input Gregorian date.
* `gDate` is a JS Date to be converted to Hijri.
*/
fromGregorian(gDate) {
const gYear = gDate.getFullYear(), gMonth = gDate.getMonth(), gDay = gDate.getDate();
let julianDay = GREGORIAN_EPOCH - 1 + 365 * (gYear - 1) + Math.floor((gYear - 1) / 4) +
-Math.floor((gYear - 1) / 100) + Math.floor((gYear - 1) / 400) +
Math.floor((367 * (gMonth + 1) - 362) / 12 + (gMonth + 1 <= 2 ? 0 : isGregorianLeapYear(gDate) ? -1 : -2) + gDay);
julianDay = Math.floor(julianDay) + 0.5;
const days = julianDay - ISLAMIC_EPOCH;
const hYear = Math.floor((30 * days + 10646) / 10631.0);
let hMonth = Math.ceil((days - 29 - getIslamicYearStart(hYear)) / 29.5);
hMonth = Math.min(hMonth, 11);
const hDay = Math.ceil(days - getIslamicMonthStart(hYear, hMonth)) + 1;
return new NgbDate(hYear, hMonth + 1, hDay);
}
/**
* Returns the equivalent JS date value for a give input islamic(civil) date.
* `hDate` is an islamic(civil) date to be converted to Gregorian.
*/
toGregorian(hDate) {
const hYear = hDate.year;
const hMonth = hDate.month - 1;
const hDay = hDate.day;
const julianDay = hDay + Math.ceil(29.5 * hMonth) + (hYear - 1) * 354 + Math.floor((3 + 11 * hYear) / 30) + ISLAMIC_EPOCH - 1;
const wjd = Math.floor(julianDay - 0.5) + 0.5, depoch = wjd - GREGORIAN_EPOCH, quadricent = Math.floor(depoch / 146097), dqc = mod(depoch, 146097), cent = Math.floor(dqc / 36524), dcent = mod(dqc, 36524), quad = Math.floor(dcent / 1461), dquad = mod(dcent, 1461), yindex = Math.floor(dquad / 365);
let year = quadricent * 400 + cent * 100 + quad * 4 + yindex;
if (!(cent === 4 || yindex === 4)) {
year++;
}
const gYearStart = GREGORIAN_EPOCH + 365 * (year - 1) + Math.floor((year - 1) / 4) - Math.floor((year - 1) / 100) +
Math.floor((year - 1) / 400);
const yearday = wjd - gYearStart;
const tjd = GREGORIAN_EPOCH - 1 + 365 * (year - 1) + Math.floor((year - 1) / 4) - Math.floor((year - 1) / 100) +
Math.floor((year - 1) / 400) + Math.floor(739 / 12 + (isGregorianLeapYear(new Date(year, 3, 1)) ? -1 : -2) + 1);
const leapadj = wjd < tjd ? 0 : isGregorianLeapYear(new Date(year, 3, 1)) ? 1 : 2;
const month = Math.floor(((yearday + leapadj) * 12 + 373) / 367);
const tjd2 = GREGORIAN_EPOCH - 1 + 365 * (year - 1) + Math.floor((year - 1) / 4) - Math.floor((year - 1) / 100) +
Math.floor((year - 1) / 400) +
Math.floor((367 * month - 362) / 12 + (month <= 2 ? 0 : isGregorianLeapYear(new Date(year, month - 1, 1)) ? -1 : -2) +
1);
const day = wjd - tjd2 + 1;
return new Date(year, month - 1, day);
}
/**
* Returns the number of days in a specific Hijri month.
* `month` is 1 for Muharram, 2 for Safar, etc.
* `year` is any Hijri year.
*/
getDaysPerMonth(month, year) {
year = year + Math.floor(month / 13);
month = ((month - 1) % 12) + 1;
let length = 29 + month % 2;
if (month === 12 && isIslamicLeapYear(year)) {
length++;
}
return length;
}
}
NgbCalendarIslamicCivil.decorators = [
{ type: Injectable }
];
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{NgbCalendarHijri} from './ngb-calendar-hijri';\nimport {NgbDate} from '../ngb-date';\nimport {Injectable} from '@angular/core';\n\n/**\n * Checks if islamic year is a leap year\n */\nfunction isIslamicLeapYear(hYear: number): boolean {\n  return (14 + 11 * hYear) % 30 < 11;\n}\n\n/**\n * Checks if gregorian years is a leap year\n */\nfunction isGregorianLeapYear(gDate: Date): boolean {\n  const year = gDate.getFullYear();\n  return year % 4 === 0 && year % 100 !== 0 || year % 400 === 0;\n}\n\n/**\n * Returns the start of Hijri Month.\n * `hMonth` is 0 for Muharram, 1 for Safar, etc.\n * `hYear` is any Hijri hYear.\n */\nfunction getIslamicMonthStart(hYear: number, hMonth: number): number {\n  return Math.ceil(29.5 * hMonth) + (hYear - 1) * 354 + Math.floor((3 + 11 * hYear) / 30.0);\n}\n\n/**\n * Returns the start of Hijri year.\n * `year` is any Hijri year.\n */\nfunction getIslamicYearStart(year: number): number {\n  return (year - 1) * 354 + Math.floor((3 + 11 * year) / 30.0);\n}\n\nfunction mod(a: number, b: number): number {\n  return a - b * Math.floor(a / b);\n}\n\n/**\n * The civil calendar is one type of Hijri calendars used in islamic countries.\n * Uses a fixed cycle of alternating 29- and 30-day months,\n * with a leap day added to the last month of 11 out of every 30 years.\n * http://cldr.unicode.org/development/development-process/design-proposals/islamic-calendar-types\n * All the calculations here are based on the equations from \"Calendrical Calculations\" By Edward M. Reingold, Nachum\n * Dershowitz.\n */\n\nconst GREGORIAN_EPOCH = 1721425.5;\nconst ISLAMIC_EPOCH = 1948439.5;\n\n@Injectable()\nexport class NgbCalendarIslamicCivil extends NgbCalendarHijri {\n  /**\n   * Returns the equivalent islamic(civil) date value for a give input Gregorian date.\n   * `gDate` is a JS Date to be converted to Hijri.\n   */\n  fromGregorian(gDate: Date): NgbDate {\n    const gYear = gDate.getFullYear(), gMonth = gDate.getMonth(), gDay = gDate.getDate();\n\n    let julianDay = GREGORIAN_EPOCH - 1 + 365 * (gYear - 1) + Math.floor((gYear - 1) / 4) +\n        -Math.floor((gYear - 1) / 100) + Math.floor((gYear - 1) / 400) +\n        Math.floor(\n            (367 * (gMonth + 1) - 362) / 12 + (gMonth + 1 <= 2 ? 0 : isGregorianLeapYear(gDate) ? -1 : -2) + gDay);\n    julianDay = Math.floor(julianDay) + 0.5;\n\n    const days = julianDay - ISLAMIC_EPOCH;\n    const hYear = Math.floor((30 * days + 10646) / 10631.0);\n    let hMonth = Math.ceil((days - 29 - getIslamicYearStart(hYear)) / 29.5);\n    hMonth = Math.min(hMonth, 11);\n    const hDay = Math.ceil(days - getIslamicMonthStart(hYear, hMonth)) + 1;\n    return new NgbDate(hYear, hMonth + 1, hDay);\n  }\n\n  /**\n   * Returns the equivalent JS date value for a give input islamic(civil) date.\n   * `hDate` is an islamic(civil) date to be converted to Gregorian.\n   */\n  toGregorian(hDate: NgbDate): Date {\n    const hYear = hDate.year;\n    const hMonth = hDate.month - 1;\n    const hDay = hDate.day;\n    const julianDay =\n        hDay + Math.ceil(29.5 * hMonth) + (hYear - 1) * 354 + Math.floor((3 + 11 * hYear) / 30) + ISLAMIC_EPOCH - 1;\n\n    const wjd = Math.floor(julianDay - 0.5) + 0.5, depoch = wjd - GREGORIAN_EPOCH,\n          quadricent = Math.floor(depoch / 146097), dqc = mod(depoch, 146097), cent = Math.floor(dqc / 36524),\n          dcent = mod(dqc, 36524), quad = Math.floor(dcent / 1461), dquad = mod(dcent, 1461),\n          yindex = Math.floor(dquad / 365);\n    let year = quadricent * 400 + cent * 100 + quad * 4 + yindex;\n    if (!(cent === 4 || yindex === 4)) {\n      year++;\n    }\n\n    const gYearStart = GREGORIAN_EPOCH + 365 * (year - 1) + Math.floor((year - 1) / 4) - Math.floor((year - 1) / 100) +\n        Math.floor((year - 1) / 400);\n\n    const yearday = wjd - gYearStart;\n\n    const tjd = GREGORIAN_EPOCH - 1 + 365 * (year - 1) + Math.floor((year - 1) / 4) - Math.floor((year - 1) / 100) +\n        Math.floor((year - 1) / 400) + Math.floor(739 / 12 + (isGregorianLeapYear(new Date(year, 3, 1)) ? -1 : -2) + 1);\n\n    const leapadj = wjd < tjd ? 0 : isGregorianLeapYear(new Date(year, 3, 1)) ? 1 : 2;\n\n    const month = Math.floor(((yearday + leapadj) * 12 + 373) / 367);\n    const tjd2 = GREGORIAN_EPOCH - 1 + 365 * (year - 1) + Math.floor((year - 1) / 4) - Math.floor((year - 1) / 100) +\n        Math.floor((year - 1) / 400) +\n        Math.floor(\n            (367 * month - 362) / 12 + (month <= 2 ? 0 : isGregorianLeapYear(new Date(year, month - 1, 1)) ? -1 : -2) +\n            1);\n\n    const day = wjd - tjd2 + 1;\n\n    return new Date(year, month - 1, day);\n  }\n\n  /**\n   * Returns the number of days in a specific Hijri month.\n   * `month` is 1 for Muharram, 2 for Safar, etc.\n   * `year` is any Hijri year.\n   */\n  getDaysPerMonth(month: number, year: number): number {\n    year = year + Math.floor(month / 13);\n    month = ((month - 1) % 12) + 1;\n    let length = 29 + month % 2;\n    if (month === 12 && isIslamicLeapYear(year)) {\n      length++;\n    }\n    return length;\n  }\n}\n"]}