This function gets a date and convert it into a Jalali (Persian) date including all possible formats. It also lets the user to convert Farsi digits to Latin ones.

Jalali_Date_API.js

// Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString

// options:
//    weekday      -> [long | short | narrow]
//    era          -> [long | short | narrow]
//    timeZoneName -> [long | short]
//
//    year         -> [numeric | 2-digit]
//    month        -> [numeric | 2-digit | long | short | narrow]
//    day          -> [numeric | 2-digit]
//    hour         -> [numeric | 2-digit]
//    minute       -> [numeric | 2-digit]
//    second       -> [numeric | 2-digit]

// to convert digits to Latin digits
// .replace(/([۰-۹])/g, token => String.fromCharCode(token.charCodeAt(0) - 1728));

function PersianDate(raw_date) {
  if (raw_date == '') {
    return ''
  }
  date = new Date(raw_date);
  json_date = {
    'weekday': {
      'long': date.toLocaleDateString('fa-IR', { weekday: 'long' }),
      'short': date.toLocaleDateString('fa-IR', { weekday: 'short' }),
      'narrow': date.toLocaleDateString('fa-IR', { weekday: 'narrow' }),
    },
    'era': {
      'long': date.toLocaleDateString('fa-IR', { era: 'long' }),
      'short': date.toLocaleDateString('fa-IR', { era: 'short' }),
      'narrow': date.toLocaleDateString('fa-IR', { era: 'narrow' }),
    },
    'timeZoneName': {
      'long': date.toLocaleDateString('fa-IR', { timeZoneName: 'long' }),
      'short': date.toLocaleDateString('fa-IR', { timeZoneName: 'short' }),
    },
    'year': {
      'numeric': date.toLocaleDateString('fa-IR', { year: 'numeric' }),
      '2-digit': date.toLocaleDateString('fa-IR', { year: '2-digit' }),
    },
    'month': {
      'numeric': date.toLocaleDateString('fa-IR', { month: 'numeric' }),
      '2-digit': date.toLocaleDateString('fa-IR', { month: '2-digit' }),
      'long': date.toLocaleDateString('fa-IR', { month: 'long' }),
      'short': date.toLocaleDateString('fa-IR', { month: 'short' }),
      'narrow': date.toLocaleDateString('fa-IR', { month: 'narrow' }),
    },
    'day': {
      'numeric': date.toLocaleDateString('fa-IR', { day: 'numeric' }),
      '2-digit': date.toLocaleDateString('fa-IR', { day: '2-digit' }),
    },
    'hour': {
      'numeric': date.toLocaleDateString('fa-IR', { hour: 'numeric' }),
      '2-digit': date.toLocaleDateString('fa-IR', { hour: '2-digit' }),
    },
    'minute': {
      'numeric': date.toLocaleDateString('fa-IR', { minute: 'numeric' }),
      '2-digit': date.toLocaleDateString('fa-IR', { minute: '2-digit' }),
    },
    'second': {
      'numeric': date.toLocaleDateString('fa-IR', { second: 'numeric' }),
      '2-digit': date.toLocaleDateString('fa-IR', { second: '2-digit' }),
    }
  }
  return json_date;
}



// examples:
//
//  1- Customize the output format
//
//     date = PersianDate(new Date())
//     console.log(date['weekday']['narrow'] + ' ' + date['day']['2-digit'] + ' ' + date['month']['long'] + ' ' + date['year']['numeric']);
//     output:
//           ی ۱۰ خرداد ۱۴۰۰
//
//  2- Get the all possible option in a JSON format
//
//     PersianDate(new Date())
//     output:
//            {
//             "weekday": {
//                 "long": "یکشنبه",
//                 "short": "یکشنبه",
//                 "narrow": "ی"
//             },
//             "era": {
//                 "long": "هجری شمسی ۱۴۰۰ ۷ ۲۵",
//                 "short": "ه‍.ش. ۱۴۰۰ ۷ ۲۵",
//                 "narrow": "ه‍.ش. ۱۴۰۰ ۷ ۲۵"
//             },
//             "timeZoneName": {
//                 "long": "۱۴۰۰/۷/۲۵،‏ وقت تابستانی مرکز اروپا",
//                 "short": "۱۴۰۰/۷/۲۵،‏ ‎+۲ گرینویچ"
//             },
//             "year": {
//                 "numeric": "۱۴۰۰",
//                 "2-digit": "۰۰"
//             },
//             "month": {
//                 "numeric": "۷",
//                 "2-digit": "۰۷",
//                 "long": "مهر",
//                 "short": "مهر",
//                 "narrow": "م"
//             },
//             "day": {
//                 "numeric": "۲۵",
//                 "2-digit": "۲۵"
//             },
//             "hour": {
//                 "numeric": "۱۴۰۰/۷/۲۵،‏ ۲۲",
//                 "2-digit": "۱۴۰۰/۷/۲۵،‏ ۲۲"
//             },
//             "minute": {
//                 "numeric": "۱۴۰۰/۷/۲۵،‏ ۵۷",
//                 "2-digit": "۱۴۰۰/۷/۲۵،‏ ۵۷"
//             },
//             "second": {
//                 "numeric": "۱۴۰۰/۷/۲۵،‏ ۳۹",
//                 "2-digit": "۱۴۰۰/۷/۲۵،‏ ۳۹"
//             }
//         }
//
//  3- Replatece Farsi digits with Latin ones, e.g. ۲۵ -> 25
//
//     date = PersianDate(new Date())
//     console.log(date['day']['2-digit'].replace(/([۰-۹])/g, token => String.fromCharCode(token.charCodeAt(0) - 1728)));
//     output:
//            25