1/** 2 * @file Describe the file 3 * Copyright (c) 2023 Huawei Device Co., Ltd. 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17/** 18 * 根据公历的年月日，获取儒略历对应的儒略日 19 * (通用算法) 20 * 21 * @param year 年份 22 * @param month 月份 23 * @param monthDay 该月日期 24 */ 25export function getJulianDay(year: number, month: number, monthDay: number): number { 26 let num = 0; 27 if (month <= 2) { 28 month += 12; 29 year -= 1; 30 } 31 if (year * 372 + month * 31 + monthDay >= 588829) { 32 num = Math.floor(year / 100); 33 num = 2 - num + Math.floor(year / 400); 34 } 35 const day: number = monthDay + 0.5000115740; 36 const date = Math.floor(365.25 * (year + 4716) + 0.01) + Math.floor(30.60001 * (month + 1)) + day + num - 1524.5; 37 return Math.floor(date); 38} 39 40export function getJulianDayByMills(date: Date, timeMills: number) { 41 if (date === null || date === undefined) { 42 date = new Date(); 43 } 44 date.setTime(timeMills); 45 return getJulianDay(date.getFullYear(), date.getMonth() + 1, date.getDate()); 46}