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/*
* Copyright 2020 Adobe. All rights reserved.
* This file is licensed to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under
* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
* OF ANY KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
// Portions of the code in this file are based on code from ICU.
// Original licensing can be found in the NOTICE file in the root directory of this source tree.
import {AnyCalendarDate} from '../types';
import {CalendarDate} from '../CalendarDate';
import {fromExtendedYear, getExtendedYear, GregorianCalendar} from './GregorianCalendar';
const BUDDHIST_ERA_START = -543;
/**
* The Buddhist calendar is the same as the Gregorian calendar, but counts years
* starting from the birth of Buddha in 543 BC (Gregorian). It supports only one
* era, identified as 'BE'.
*/
export class BuddhistCalendar extends GregorianCalendar {
identifier = 'buddhist';
fromJulianDay(jd: number): CalendarDate {
let gregorianDate = super.fromJulianDay(jd);
let year = getExtendedYear(gregorianDate.era, gregorianDate.year);
return new CalendarDate(
this,
year - BUDDHIST_ERA_START,
gregorianDate.month,
gregorianDate.day
);
}
toJulianDay(date: AnyCalendarDate) {
return super.toJulianDay(toGregorian(date));
}
getEras() {
return ['BE'];
}
getDaysInMonth(date: AnyCalendarDate): number {
return super.getDaysInMonth(toGregorian(date));
}
balanceDate() {}
}
function toGregorian(date: AnyCalendarDate) {
let [era, year] = fromExtendedYear(date.year + BUDDHIST_ERA_START);
return new CalendarDate(
era,
year,
date.month,
date.day
);
}
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