Natively Format Javascript Dates & Numbers in different Locales (Including Persian Calendar)

Native Date and Number Formatting.js

(12345.6789).toLocaleString("fa-IR"); // ۱۲٬۳۴۵٫۶۷۹

var now = new Date();

now.toLocaleString(); // 1/27/2018, 12:07:03 AM
now.toLocaleDateString(); // 1/27/2018
now.toLocaleTimeString(); // 12:07:03 AM

now.toLocaleString("fa-IR") // ۱۳۹۶/۱۱/۷،‏ ۰:۰۷:۰۳
now.toLocaleDateString("fa-IR") // ۱۳۹۶/۱۱/۷
now.toLocaleTimeString("fa-IR") // ۰:۰۷:۰۳

var formatOptions = {weekday: 'long', year: 'numeric', month: 'long', day: 'numeric'};
now.toLocaleString("en-US", formatOptions); // "Saturday, January 27, 2018"
now.toLocaleDateString("fa-IR", formatOptions); //۱۳۹۶ بهمن ۷, شنبه

/*
Syntax
  toLocale...([locale [, options]]);

Locale
  String or Array of Strings of locale code (language-COUNTRY) & two extra options for Numbering system & Calendar selection as below:
  "nu": "arab", "arabext", "bali", "beng", "deva", "fullwide", "gujr", "guru", "hanidec", "khmr", "knda", "laoo", "latn", "limb", "mlym", "mong", "mymr", "orya", "tamldec", "telu", "thai", "tibt"
  "ca": "gregory", "persian", "islamic", "islamicc", "iso8601", "buddhist", "chinese", "coptic", "ethioaa", "ethiopic", "hebrew", "indian", "japanese", "roc"

Options
  Object with following params:
  "weekday": "narrow", "short", "long", locale-specific by default
  "month": "numeric", "2-digit", "narrow", "short", "long", locale-specific by default
  "year", "day", "hour", "minute", "second":  "numeric", "2-digit", locale-specific by default
  "hour12": true, false, locale-specific by default
  "timeZoneName": "short", "long", locale-specific by default
  "localeMatcher": "lookup", "best fit" (default)
  "formatMatcher": "basic", "best fit" (default)

Option Subsets
    weekday, year, month, day, hour, minute, second
    weekday, year, month, day
    year, month, day
    year, month
    month, day
    hour, minute, second
    hour, minute
*/

hi how change digit this ۱۳۹۶/۱۱/۷ to 1396/11/7

hi how change digit this ۱۳۹۶/۱۱/۷ to 1396/11/7

Looking at the documentation (which I tried to describe like a cheatsheet in comments) you can pass options, and your usecase could be generated like:

now.toLocaleDateString('fa-IR', {numberingSystem: 'latn'})

you can use this for your purpose
now.toLocaleDateString("fa-IR-u-nu-latn")