将 gregorian 日期转换为 angular 2 和 Ionic 2 中的波斯（jalali）日期

Question

我熟悉位于 npm 中的一个包，用于将公历日期转换为波斯语 (jalali)，但我不知道应该如何在 ionic 2 angular 2 项目中使用它。

Jalali-date

或角度 1 的这个包：

ADM-dateTimePicker

是否可以将此包转换为 angular 2？任何想法？欢迎或教程...

Answer 1

好的，我为此编写了转换器，

首先在你的项目中添加一个提供者：

import {Injectable} from '@angular/core';
@Injectable()
export class PersianCalendarService {
  weekDayNames: string[] = ["شنبه", "یکشنبه", "دوشنبه",
    "سه شنبه", "چهارشنبه",
    "پنج شنبه", "جمعه"];
  monthNames: string[] = [
    "فروردین",
    "اردیبهشت",
    "خرداد",
    "تیر",
    "مرداد",
    "شهریور",
    "مهر",
    "آبان",
    "آذر",
    "دی",
    "بهمن",
    "اسفند"];
  strWeekDay: string = null;
  strMonth: string = null;
  day: number = null;
  month: number = null;
  year: number = null;
  ld: number = null;
  farsiDate: string = null;

  today: Date = new Date();

  gregorianYear = null;
  gregorianMonth = null;
  gregorianDate = null;
  WeekDay = null;
  buf1: number[] = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
  buf2: number[] = [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335];

  constructor() {
  }
  PersianCalendar(gregorianDate): string {
    this.today = gregorianDate;
    this.gregorianYear = this.today.getFullYear();
    this.gregorianMonth = this.today.getMonth() + 1;
    this.gregorianDate = this.today.getDate();
    this.WeekDay = this.today.getDay();
    this.toPersian(gregorianDate);
    return this.strWeekDay + " " + this.day + " " + this.strMonth + " " + this.year;


  }
  toPersian(gregorianDate) {
    if ((this.gregorianYear % 4) != 0)
      this.farsiDate = this.func1();
    else
      this.farsiDate = this.func2();
    this.strMonth = this.monthNames[Math.floor(this.month - 1)];
    this.strWeekDay = this.weekDayNames[this.WeekDay + 1];

  }


  func1(): string {
    this.day = this.buf1[this.gregorianMonth - 1] + this.gregorianDate;
    if (this.day > 79) {
      this.day = this.day - 79;
      if (this.day <= 186) {
        var day2 = this.day;
        this.month = (day2 / 31) + 1;
        this.day = (day2 % 31);
        if (day2 % 31 == 0) {
          this.month--;
          this.day = 31;
        }
        this.year = this.gregorianYear - 621;
      }
      else {
        var day2 = this.day - 186;
        this.month = (day2 / 30) + 7;
        this.day = (day2 % 30);
        if (day2 % 30 == 0) {
          this.month = (day2 / 30) + 6;
          this.day = 30;
        }
        this.year = this.gregorianYear - 621;
      }
    }
    else {
      this.ld = this.gregorianYear > 1996 && this.gregorianYear % 4 == 1 ? 11 : 10;
      var day2 = this.day + this.ld;
      this.month = (day2 / 30) + 10;
      this.day = (day2 % 30);
      if (day2 % 30 == 0) {
        this.month--;
        this.day = 30;
      }
      this.year = this.gregorianYear - 622;
    }
    var fullDate = this.day + "/" + Math.floor(this.month) + "/" + this.year;
    return fullDate
  }



  func2(): string {
    //console.log("entered func2");
    this.day = this.buf2[this.gregorianMonth - 1] + this.gregorianDate;
    this.ld = this.gregorianYear >= 1996 ? 79 : 80;
    if (this.day > this.ld) {
      this.day = this.day - this.ld;
      if (this.day <= 186) {
        var day2 = this.day;
        this.month = (day2 / 31) + 1;
        this.day = (day2 % 31);
        if (day2 % 31 == 0) {
          this.month--;
          this.day = 31;
        }
        this.year = this.gregorianYear - 621;
      } else {
        var day2 = this.day - 186;
        this.month = (day2 / 30) + 7;
        this.day = (day2 % 30);
        if (day2 % 30 == 0) {
          this.month--;
          this.day = 30;
        }
        this.year = this.gregorianYear - 621;
      }
      var fullDate = this.day + "/" + Math.floor(this.month) + "/" + this.year;
      return fullDate
    }
    else {
      var day2 = this.day + 10;
      this.month = (day2 / 30) + 10;
      this.day = (day2 % 30);
      if (day2 % 30 == 0) {
        this.month--;
        this.day = 30;
      }
      this.year = this.gregorianYear - 622;
    }
  }
}

下一步：在您的代码中导入此服务：

import {PersianCalendarService} from '../../providers/persian-calendar-service/persian-calendar-service';

下一步：在 @Page 部分实现提供者的名称

@Page({
  templateUrl: 'build/pages/getting-started/getting-started.html',
  providers: [PersianCalendarService]
})

在构造函数

中

constructor(
   public persianCalendarService: PersianCalendarService) {}

那么您只需将日期传递给函数以获得良好的 Jalali 日期输出：

 getJalaliDate(date) {
var date1 = this.persianCalendarService.PersianCalendar(date);
this.farsiDate = date1;

}

我会尽快将这段代码添加到 github 中。 谢谢

Answer 2

使用jalali-moment模块作为如下代码

import * as moment from 'jalali-moment';
let jalaliDate = moment('1989/1/24').locale('fa').format('YYYY/M/D'); // 1367/11/4

demo in plunker

Answer 3

您可以通过 Jalali 日历和公历之间的毫秒差来做到这一点，这是我的解决方案：

var g_date = new Date("2018-04-04 00:00:00"); // example Gregorian date
g_date_in_milliseconds = date.getTime(); // Gregorian date in milliseconds
const difference =  1.9603638 * Math.pow(10, 13); // difference of Jalali calendar and Gregoria
j_date_in_milliseconds = g_date_in_milliseconds - difference; // converted to Jalali milliseconds
j_date = new Date(j_date_in_milliseconds); // converted to date object

您可以通过这种技术轻松地将 Jalali 转换为公历：

g_date_in_milliseconds = j_date_in_milliseconds + difference;
g_date = new Date(g_date_in_milliseconds);

Answer 4

简单地说：

new Date(2019,2,21).toLocaleDateString('fa-Ir');

// 输出 => 1398/1/1

Answer 5

无需使用任何软件包。您可以使用toLocaleDateString 方法。

就这么简单：

var d = new Date();
console.info(d.toLocaleDateString("fa-IR"))

输出将类似于۱۳۹۹/۳/۱۰

但是您可以使用选项来获得更好的外观！例如：

const options = { year: 'numeric', month: 'long', day: 'numeric' };
console.info(d.toLocaleDateString("fa-IR", options))
// output> ۱۰ خرداد ۱۳۹۹

注意：如果您将方向更改为rtl，它看起来正确！

再举一个例子：

const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
console.info(d.toLocaleDateString("fa-IR", options))
// output> ۱۳۹۹ خرداد ۱۰, شنبه

再次声明：您必须使用rtl 方向才能正确查看！

您也可以使用Intl.toLocaleTimeString 显示时间。像这样：

console.info(d.toLocaleDateString("fa-IR"));
// output> ۱۶:۰۶:۰۰

const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
console.info(d.toLocaleDateString("fa-IR", options));
// output> ۱۳۹۹ خرداد ۱۰, شنبه،‏ ۱۶:۰۴:۱۶

最后一次！不要忘记rtl 方向。