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