https://github.com/shahabyazdi/date-object
JavaScript library for working with Date and Time in different calendars and locals
https://github.com/shahabyazdi/date-object
arabic calendar calendars datetime format-date gerogian hijri hindi indian indian-calendar islamic-calendar jalali javascript nodejs persian persian-calendar shamsi
Last synced: 3 months ago
JSON representation
JavaScript library for working with Date and Time in different calendars and locals
- Host: GitHub
- URL: https://github.com/shahabyazdi/date-object
- Owner: shahabyazdi
- License: mit
- Created: 2020-08-20T15:07:42.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2024-10-17T12:47:49.000Z (over 1 year ago)
- Last Synced: 2025-09-23T22:15:39.751Z (4 months ago)
- Topics: arabic, calendar, calendars, datetime, format-date, gerogian, hijri, hindi, indian, indian-calendar, islamic-calendar, jalali, javascript, nodejs, persian, persian-calendar, shamsi
- Language: JavaScript
- Homepage: https://shahabyazdi.github.io/date-object/
- Size: 1.11 MB
- Stars: 14
- Watchers: 2
- Forks: 10
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Date Object
supported calendars: `gregorian` , `persian` , `arabic` , `indian`
default: `gregorian`
supported locales: `en` , `fa` , `ar` , `hi`
default: `en`
React: [react-date-object](https://github.com/shahabyazdi/react-date-object)
[Descriptions](https://shahabyazdi.github.io/react-multi-date-picker/date-object/)
# Versions before 2.0.0
The way to entering `calendars` and `locales` for the versions before 2.0.0 is different.
To see the readme file for v1.x click here
# 1- Install
## 1-1- npm:
```shell
npm install date-object --save
```
## 1-2- yarn:
```shell
yarn add date-object
```
## 1-3- jsDelivr:
```javascript
```
# 2- Usage
## 2-1- NodeJS:
```javascript
var DateObject = require("date-object");
var date = new DateObject();
console.log(date.format()); //2021/06/10
```
## 2-1- Browser:
```html
DateObject
Gregorian:
Persian:
const format = "dddd DD MMMM YYYY";
const gregorian = new DateObject();
const solarHijri = new DateObject({
calendar: persian,
locale: persian_fa,
});
document.getElementById("gregorian").textContent =
gregorian.format(format);
document.getElementById("persian").textContent =
solarHijri.format(format);
```
# 3- Calendars
**You only need to import Calendar if you want to use a calendar other than Gregorian.**
Calendar
CJS
ES
UMD
Gregorian
/calendars/cjs/gregorian.js
/calendars/es/gregorian.js
/calendars/umd/gregorian.min.js
Persian
/calendars/cjs/persian.js
/calendars/es/persian.js
/calendars/umd/persian.min.js
* Jalali
/calendars/cjs/jalali.js
/calendars/es/jalali.js
/calendars/umd/jalali.min.js
Arabic
/calendars/cjs/arabic.js
/calendars/es/arabic.js
/calendars/umd/arabic.min.js
Indian
/calendars/cjs/indian.js
/calendars/es/indian.js
/calendars/umd/indian.min.js
**\* Due to the use of conventional calculations in the Jalali calendar, converting a date to a Jalali calendar from other calendars may differ by one day compared to the Persian (solar Hijri) calendar.**
Examples
## 3-1- Persian Calendar (Solar Hijri)
```javascript
var DateObject = require("date-object");
var persian = require("date-object/calendars/cjs/persian");
var date = new DateObject({ calendar: persian });
console.log(date.format()); //1400/03/20
```
## 3-2- Arabic Calendar (Islamic Hijri)
```javascript
var DateObject = require("date-object");
var arabic = require("date-object/calendars/cjs/arabic");
var date = new DateObject({ calendar: arabic });
console.log(date.format()); //1442/10/29
```
## 3-3- Indian Calendar
```javascript
var DateObject = require("date-object");
var indian = require("date-object/calendars/cjs/indian");
var date = new DateObject({ calendar: indian });
console.log(date.format()); //1943/03/20
```
# 4- Locales
**You only need to import Locale if you want to use a locale other than En.**
Calendars
Gregorian
Persian
Jalali
Arabic
Indian
Locales
English
gregorian_en
persian_en
persian_en
arabic_en
indian_en
Portuguese - BRAZIL
gregorian_pt_br
-
-
-
-
Farsi
gregorian_fa
persian_fa
persian_fa
arabic_fa
indian_fa
Arabic
gregorian_ar
persian_ar
persian_ar
arabic_ar
indian_ar
Hindi
gregorian_hi
persian_hi
persian_hi
arabic_hi
indian_hi
Examples
## 4-1- Persian Calendar, Farsi Locale
```javascript
var DateObject = require("date-object");
var persian = require("date-object/calendars/cjs/persian");
var persian_fa = require("date-object/locales/cjs/persian_fa");
var date = new DateObject({ calendar: persian, locale: persian_fa });
console.log(date.format()); //۱۴۰۰/۰۳/۲۰
```
## 4-2- Arabic Calendar, Arabic Locale
```javascript
var DateObject = require("date-object");
var arabic = require("date-object/calendars/cjs/arabic");
var arabic_ar = require("date-object/locales/cjs/arabic_ar");
var date = new DateObject({ calendar: arabic, locale: arabic_ar });
console.log(date.format()); //١٤٤٢/١٠/٢٩
```
## 4-3- Indiann Calendar, Hindi Locale
```javascript
var DateObject = require("date-object");
var indian = require("date-object/calendars/cjs/indian");
var indian_hi = require("date-object/locales/cjs/indian_hi");
var date = new DateObject({ calendar: indian, locale: indian_hi });
console.log(date.format()); //१९४३/०३/२०
```
# 5- Examples
## 5-1- new instance
### 5-1-1- String (year month day hour minute second millisecond meridiem)
```javascript
var DateObject = require("date-object");
var date = new DateObject("2020 8 21 11 55 36 100 am");
console.log(date.format("YYYY/MM/DD hh:mm:ss.SSS a")); //2020/08/21 11:55:36.100 am
date = new DateObject("2020/08/01");
console.log(date.format("YYYY/MM/DD hh:mm:ss.SSS a")); //2020/08/01 12:00:00.000 am
```
### 5-1-2- Number (unix time in milliseconds)
```javascript
var DateObject = require("date-object");
var date = new DateObject(1597994736000);
console.log(date.format("dddd DD MMMM @ hh:mm:ss.SSS a")); //Friday 21 August @ 11:55:36.000 am
```
### 5-1-3- JavaScript Date
```javascript
var DateObject = require("date-object");
var $date = new Date(2019, 8, 20);
var date = new DateObject($date);
console.log(date.format()); //2019/09/20
```
### 5-1-4- DateObject
```javascript
var DateObject = require("date-object");
var $date = new DateObject("2019/09/20");
var date = new DateObject($date);
console.log(date.format()); //2019/09/20
```
### 5-1-5- Object
#### 5-1-5-1-
```javascript
{
date: String , Number(unix time in milliseconds), Date or DateObject, //default new Date()
calendar: Calendar, //default gregorian
locale: Locale, //default en
format: String, //default `YYYY/MM/DD`
ignoreList:Array//If the format contained words that should be ignored
}
```
```javascript
var DateObject = require("date-object");
var persian = require("date-object/calendars/cjs/persian");
var persian_fa = require("date-object/locales/cjs/persian_fa");
var persian_en = require("date-object/locales/cjs/persian_en");
var date = new DateObject({
date: new Date(),
});
console.log(date.format()); //2020/08/21
date = new DateObject({
date: new Date(),
calendar: persian,
locale: persian_fa,
});
console.log(date.format()); //۱۳۹۹/۰۵/۳۱
date = new DateObject({
date: "31 Mordad 1399",
format: "DD MMMM YYYY",
calendar: persian,
locale: persian_en,
});
console.log(date.format()); //31 Mordad 1399
```
#### 5-1-5-2-
```javascript
{
year: Number,
month: Number,
day: Number,
hour: Number, //default 0
minute: Number, //default 0
second: Number, //default 0
millisecond: Number, //default 0
calendar: Calendar, //default gregorian
locale: Locale, //default en
format: String, //default `YYYY/MM/DD`
ignoreList:Array//If the format contained words that should be ignored
}
```
```javascript
var DateObject = require("date-object");
var persian = require("date-object/calendars/cjs/persian");
var persian_en = require("date-object/locales/cjs/persian_en");
var persian_fa = require("date-object/locales/cjs/persian_fa");
var date = new DateObject({
year: 2020,
month: 8,
day: 21,
hour: 12,
minute: 20,
second: 36,
milisecond: 152,
format: "dddd DD MMMM YYYY",
});
console.log(date.format()); //Friday 21 August 2020
date = new DateObject({
year: 1399,
month: 5,
day: 31,
calendar: persian,
locale: persian_en,
format: "dddd DD MMMM YYYY",
});
console.log(date.format()); //Jomeh 31 Mordad 1399
date = new DateObject({
year: 1399,
month: 5,
day: 31,
calendar: persian,
locale: persian_fa,
format: "dddd DD MMMM YYYY",
});
console.log(date.format()); //جمعه ۳۱ مرداد ۱۳۹۹
```
## 5-2- convert(calendar:Calendar, locale?:Locale)
If you use the convert method without argument, the date will be converted to Gregorian calendar.
The second argument (Locale) is optional.
```javascript
var DateObject = require("date-object");
var gregorian = require("date-object/calendars/cjs/gregorian");
var persian = require("date-object/calendars/cjs/persian");
var arabic = require("date-object/calendars/cjs/arabic");
var indian = require("date-object/calendars/cjs/indian");
var date = new DateObject();
console.log(date.format()); //2020/10/31
date.convert(persian);
console.log(date.format()); //1399/08/10
date.convert(arabic);
console.log(date.format()); //1442/03/14
date.convert(indian);
console.log(date.format()); //1942/08/09
date.convert(gregorian); //or date.convert()
console.log(date.format()); //2020/10/31
```
## 5-3- format(token:String)
default format is YYYY/MM/DD.
to see all format types click [here](#6--Formatting-Tokens)
```javascript
var DateObject = require("date-object");
var date = new DateObject();
consoel.log(date.format()); //2020/10/31
consoel.log(date.format("MM/DD/YYYY")); //10/31/2020
consoel.log(date.format("MMM/DD/YYYY HH:mm:ss")); //Oct/31/2020 18:17:28
consoel.log(date.format("dddd DD MMMM YYYY, hh:mm:ss A")); //Saturday 31 October 2020, 06:19:18 PM
consoel.log(date.format("ddd DD MMM YYYY, hh:mm a")); //Sat 31 Oct 2020, 06:20 pm
```
### formatting with ignore list:
```javascript
var DateObject = require("date-object");
var date = new DateObject();
console.log(
date.format("hours:HH minutes:mm seconds:ss", ["hours", "minutes", "seconds"])
); //hours:12 minutes:22 seconds:40
console.log(date.format("it's HH o'clock", ["it's", "o'clock"])); //it's 12 o'clock
console.log(
date.format(`DD MMMM at hh:mm ${date.hour >= 12 ? "Afternoon" : "Morning"}`, [
"at",
"Afternoon",
"Morning",
])
); //11 November at 12:22 Afternoon
```
## 5-4- setter methods
```javascript
var DateObject = require("date-object");
var gregorian = require("date-object/calendars/cjs/gregorian");
var persian = require("date-object/calendars/cjs/persian");
var indian = require("date-object/calendars/cjs/indian");
var gregorian_en = require("date-object/locales/cjs/gregorian_en");
var persian_en = require("date-object/locales/cjs/persian_en");
var indian_en = require("date-object/locales/cjs/indian_en");
var date = new DateObject();
date
.setCalendar(gregorian)
.setFormat("YYYY-MM-DD HH:mm:ss.SSS")
.setLocale(gregorian_en)
.setYear(2020)
.setMonth(9)
.setDay(21)
.setHour(12)
.setMinute(20)
.setSecond(14)
.setMillisecond(200);
console.log(date.format()); //2020-09-21 12:20:14.200
date
.setCalendar(persian)
.setLocale(persian_en)
.setYear(1399)
.setMonth(9)
.setDay(21)
.setFormat("dddd DD MMMM YYYY");
console.log(date.format()); //Jom'eh 21 Azar 1399
date.setDate(new Date(2020, 9, 27)).setLocale(gregorian_en); //(calendar is set to gregorian)
console.log(date.format()); //Tuesday 27 October 2020
date.setDate(
new DateObject({
calendar: indian,
locale: indian_en,
year: 1942,
month: 8,
day: 5,
})
); //format is set based on given DateObject (default:YYYY/MM/DD)
console.log(date.format()); //1942/08/05
```
## 5-5- get and set
```javascript
var DateObject = require("date-object");
var date = new DateObject();
console.log(date.format()); //2020/08/21
date.year += 2;
date.month += 2;
date.day += 2;
date.hour += 2;
date.minute += 2;
date.second += 2;
date.millisecond += 2;
console.log(date.format()); //2022/10/23
console.log(date.month);
/**
* {
* name: 'October',
* shortName: 'Oct',
* length: 31,
* index: 9,
* number: 10,
* toString: [Function (anonymous)]
* }
*/
console.log(date.weekDay);
/**
* {
* name: 'Sunday',
* shortName: 'Sun',
* index: 0,
* number: 1,
* toString: [Function (anonymous)]
* }
*/
var { year, month, weekDay, day } = date;
console.log(`${weekDay.name} ${year}/${month}/${day}`); //Sunday 2022/10/23
date.year = 2020;
date.month = 8;
date.day = 21;
date.isLeap; //true
date.isValid; //true
date.isUTC; //false
date.month.name; //August
date.month.length; //31
date.month.index; //7
date.month.number; //8
date.weekDay.name; //Friday
date.weekDay.index; //5
date.weekDay.number; //6
date.dayOfBeginning; //737658
date.dayOfYear; //234
date.daysLeft; //132
date.weekOfYear; //34
date.unix; //1597951800 (unix time in seconds)
date.weekDays; // array [{ name: 'Sunday', shortName: 'Sun', ...}]
date.months; //array [{ name: 'January', shortName: 'Jan', ...}]
date.leaps; //array [4, 8, 12, 16, 20,...]
date.calendar.name; //gregorian
```
## 5-6- parse(date:String)
Remember that parsing date is based on the format you set
```javascript
var DateObject = require("date-object");
var persian = require("date-object/calendars/cjs/persian");
var persian_en = require("date-object/locales/cjs/persian_en");
var date = new DateObject();
date._format = "dddd DD MMMM YYYY";
date.parse("Monday 24 August 2020");
console.log(date.format("YYYY/MM/DD")); //2020/08/24
date.parse("Friday 07 August 2020");
console.log(date.format("YYYY-MM-DD")); //2020-08-07
date
.setCalendar(persian)
.setLocale(persian_en)
.setFormat("YYYY/MM/DD")
.parse("1399/06/03");
console.log(date.format()); //1399/06/03
date.setFormat("YYYY/MM/DD HH:mm").parse("1399/06/03 12:32");
console.log(date.format("dddd DD MMMM @ hh:mm a")); //Doshanbeh 03 Shahrivar @ 12:32 pm
```
## 5-7- getValue
```javascript
var Dateobject = require("date-object");
var arabic_ar = require("date-object/locales/cjs/arabic_ar.js");
var date = new DateObject({
date: "1442/01/01",
calendar: arabic,
locale: arabic_ar,
});
console.log(date.getValue("M")); //1
console.log(date.format("M")); //١
console.log(typeof date.getValue("D")); //number
console.log(typeof date.format("D")); //string
console.log(Number(date.getValue("YYYY"))); //1442
console.log(Number(date.format("YYYY"))); //NaN
```
## 5-8- add(duration:Number or String,type:String)
Types
years
year
y
months
month
M
days
day
d
hours
hour
h
minutes
minute
m
seconds
second
s
milliseconds
millisecond
ms
```javascript
var DateObject = require("date-object");
var date = new DateObject("2020/10/07 5:35:24 pm");
date.setFormat("YYYY/MM/DD hh:mm:ss.SSS");
console.log(date.add(2, "years").format()); //2022/10/07 05:35:24.000
console.log(date.add("1", "month").format()); //2022/11/07 05:35:24.000
console.log(date.add(3, "d").format()); //2022/11/10 05:35:24.000
console.log(date.add(4, "hours").format()); //2022/11/10 09:35:24.000
console.log(date.add(1, "minute").format()); //2022/11/10 09:36:24.000
console.log(date.add("20", "s").format()); //2022/11/10 09:36:44.000
console.log(date.add(100, "milliseconds").format()); //2022/11/10 09:36:44.100
```
## 5-9- subtract(duration:Number or String,type:String)
Types
years
year
y
months
month
M
days
day
d
hours
hour
h
minutes
minute
m
seconds
second
s
milliseconds
millisecond
ms
```javascript
var DateObject = require("date-object");
var yesterday = new DateObject().subtract(1, "day");
```
## 5-10- set method
### 5-10-1 set(key:String,value:Any)
```javascript
var DateObject = require("date-object");
var indian = require("date-object/calendars/cjs/indian");
var persian = require("date-object/calendars/cjs/persian");
var indian_hi = require("date-object/locales/cjs/indian_hi");
var persian_en = require("date-object/locales/cjs/persian_en");
var date = new DateObject(); //2020/10/31
console.log(date.set("year", 2021)); //2021/10/31
console.log(date.set("month", 1)); //2021/01/31
console.log(date.set("day", 7)); //2021/01/07
console.log(date.set("format", "MM/DD/YYYY")); //01/07/2021
console.log(date.set("calendar", indian)); //10/17/1942
console.log(date.set("locale", indian_hi)); //१०/१७/१९४२
console.log(date.set("date", new Date())); //2020/10/31 (calendar is set to gregorian)
console.log(
date.set("date", new DateObject({ calendar: persian, locale: persian_en }))
); //1399/08/10 (calendar & locale is set to given values)
```
### 5-10-2 set(object)
```javascript
var DateObject = require("date-object");
var persian = require("date-object/calendars/cjs/persian");
var gregorian = require("date-object/calendars/cjs/gregorian");
var persian_en = require("date-object/locales/cjs/persian_en");
var gregorian_en = require("date-object/locales/cjs/gregorian_en");
var date = new DateObject(); //2020/10/31
console.log(
date
.set({ calendar: persian, locale: persian_en, format: "dddd DD MMMM YYYY" })
.format()
); //Shanbeh 10 Aban 1399
console.log(
date
.set({
calendar: gregorian,
locale: gregorian_en,
year: 2020,
month: 11,
day: 12,
})
.format()
); //Saturday 12 December 2020
console.log(date.set(new DateObject().toObject()).format()); //2020/10/31
console.log(
date.set({ format: "Date:MM/DD/YYYY", ignoreList: ["Date"] }).format()
); //Date:10/31/2020
```
## 5-11- toUTC()
```javascript
var DateObject = require("date-object");
var arabic = require("date-object/calendars/cjs/arabic");
var gregorian = require("date-object/calendars/cjs/gregorian");
var arabic_en = require("date-object/locales/cjs/arabic_en");
var gregorian_en = require("date-object/locales/cjs/gregorian_en");
var date = new Date(); //Wed Oct 14 2020 11:12:18 GMT+0330
var dateObject = new DateObject({
date,
calendar: arabic,
locale: arabic_en,
format: "ddd, DD MMM YYYY HH:mm:ss",
});
console.log(dateObject.format()); //Arb, 26 Sa 1442 11:12:18
console.log(`
dateUTC : ${date.toUTCString()}
arabicUTC : ${dateObject.toUTC().toString()}
gregorianUTC : ${dateObject.convert(gregorian, gregorian_en).toString()}
`);
/**
* dateUTC : Wed, 14 Oct 2020 07:42:18 GMT
* arabicUTC : Arb, 26 Sa 1442 07:42:18
* gregorianUTC : Wed, 14 Oct 2020 07:42:18
*/
```
## 5-12- custom months, week days & digits
See the example below in case you want to use your personal data instead of default months, week days & digits
```javascript
var DateObject = require("date-object");
var date = new DateObject();
console.log(date.format("MMMM MMM")); //November Nov
console.log(date.format("dddd ddd")); //Monday Mon
console.log(date.format("D")); //2
date.months = [
["jan", "j"], //[["name","shortName"], ... ]
["feb", "f"],
["mar", "m"],
["apr", "a"],
["may", "m"],
["jun", "j"],
["jul", "j"],
["aug", "a"],
["sep", "s"],
["oct", "o"],
["nov", "n"],
["dec", "d"],
];
date.weekDays = [
["su", "s"], //[["name","shortName"], ... ]
["mo", "m"],
["tu", "t"],
["we", "w"],
["th", "t"],
["fr", "f"],
["sa", "s"],
];
/**
* This is just a test to display digits.
* The Greek number system does not work like this.
*/
date.digits = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"];
console.log(date.format("MMMM MMM")); //nov n
console.log(date.format("dddd ddd")); //mo m
console.log(date.format("D")); //II
console.log(date.month);
/**
*{
* name: 'nov',
* shortName: 'n',
* length: 30,
* index: 10,
* number: 11,
* toString: [Function (anonymous)]
* valueOf: [Function: valueOf]
*}
*/
console.log(date.weekDay);
/**
*{
* name: 'mo',
* shortName: 'm'
* index: 1,
* number: 2,
* toString: [Function: toString],
* valueOf: [Function: valueOf]
*}
*/
console.log(date.digits);
/**
* [
* '', 'I', 'II',
* 'III', 'IV', 'V',
* 'VI', 'VII', 'VIII',
* 'IX'
* ]
*/
```
You can use `date.setMonths(months).setWeekDays(weekDays).setDigits(digits)` as well
## 5-13- other methods
```javascript
var DateObject = require("date-object");
var date = new DateObject();
console.log(date.toFirstOfWeek().format()); //2020/08/16
console.log(date.toFirstOfMonth().format()); //2020/08/01
console.log(date.toFirstOfYear().format()); //2020/01/01
console.log(date.toFirstWeekOfYear().format()); //2020/01/05
console.log(date.toLastOfMonth().format()); //2020/01/31
console.log(date.toLastOfWeek().format()); //2020/02/01
console.log(date.toLastOfYear().format()); //2020/12/31
console.log(date.toLastWeekOfYear().format()); //2020/12/27
console.log(date.toString()); //2020/12/27
console.log(date.toDate()); //2020-12-27T07:38:34.724Z
console.log(date.toUnix()); //1609054714 (unix time in seconds)
console.log(date.toJulianDay()); //2459210
console.log(date.toObject());
/**
*{
* year: 2020,
* month: {
* name: 'December',
* shortName: 'Dec',
* length: 31,
* index: 11,
* number: 12,
* toString: [Function: toString],
* valueOf: [Function: valueOf]
* },
* day: 27,
* weekDay: {
* name: 'Sunday',
* shortName: 'Sun',
* index: 0,
* number: 1,
* toString: [Function: toString],
* valueOf: [Function: valueOf]
* },
* hour: 11,
* minute: 8,
* second: 34,
* millisecond: 724,
* weekOfYear: 52,
* dayOfYear: 362,
* daysLeft: 4,
* calendar: {
* name: 'gregorian',
* startYear: 1,
* yearLength: 365,
* epoch: 1721424,
* century: 20,
* weekDaysIndex: [
* 0, 1, 2, 3,
* 4, 5, 6
* ],
* getMonthLengths: [Function: getMonthLengths],
* isLeap: [Function: isLeap],
* getLeaps: [Function: getLeaps],
* getDayOfYear: [Function: getDayOfYear],
* getAllDays: [Function: getAllDays],
* leapsLength: [Function: leapsLength],
* guessYear: [Function: guessYear]
* },
* locale: {
* months: [
* [Array], [Array],
* [Array], [Array],
* [Array], [Array],
* [Array], [Array],
* [Array], [Array],
* [Array], [Array]
* ],
* weekDays: [
* [Array], [Array],
* [Array], [Array],
* [Array], [Array],
* [Array]
* ],
* digits: [
* '0', '1', '2', '3',
* '4', '5', '6', '7',
* '8', '9'
* ],
* meridiems: [ [Array], [Array] ]
* },
* format: 'YYYY/MM/DD',
* ignoreList: []
*}
*/
console.log(date.toJSON()); //1609054714724
console.log(JSON.stringify({ date })); //{"date":1609054714724}
console.log(new DateObject(date.toJSON()).format()); //2020/12/27
```
## 5-14 valueOf()
returns unix time in milliseconds
```javascript
var DateObject = require("date-object");
var persian_calendar = require("date-object/calendars/cjs/persian");
var arabic_calendar = require("date-object/calendars/cjs/arabic");
var indian_calendar = require("date-object/calendars/cjs/indian");
var gregorian = new DateObject();
var persian = new DateObject({ date: gregorian, calendar: persian_calendar });
var arabic = new DateObject({ date: gregorian, calendar: arabic_calendar });
var indian = new DateObject({ date: gregorian, calendar: indian_calendar });
console.log(gregorian.valueOf(), gregorian.format()); //1604824018304 2020/11/08
console.log(persian.valueOf(), persian.format()); //1604824018304 1399/08/18
console.log(indian.valueOf(), indian.format()); //1604824018304 1942/08/17
console.log(arabic.valueOf(), arabic.format()); //1604824018304 1442/03/22
console.log(persian - gregorian === 0); //true
```
## 5-15- using calendars, format & locales
```javascript
var DateObject = require("date-object");
var gregorian = require("date-object/calendars/cjs/gregorian");
var persian = require("date-object/calendars/cjs/persian");
var arabic = require("date-object/calendars/cjs/arabic");
var persian_fa = require("date-object/locales/cjs/persian_fa");
var gregorian_en = require("date-object/locales/cjs/gregorian_en");
var date = new DateObject({
calendar: gregorian,
format: "dddd DD MMMM",
});
console.log(date.format()); //Friday 21 August
date.calendar = persian;
date.locale = persian_fa; //جمعه 31 مرداد
console.log(date.format());
date._format = "YY/MM/DD";
console.log(date.format()); //۹۹/۰۵/۳۱
date.setCalendar(gregorian).setLocale(gregorian_en);
console.log(date.format()); //20/08/21
date = new DateObject(new Date());
console.log(date.convert(persian).format()); //1399/05/31
console.log(date.convert(arabic).format()); //1442/01/02
```
# 6- Formatting Tokens
| Token | Example | Description | Availability (Parse /Format) |
| ----- | :---------------------------: | :--------------------------: | ---------------------------- |
| YYYY | 2020 | full year | both |
| YY | 20 | 2 digits year | both |
| MMMM | December | month name | both |
| MMM | Dec | month short name | both |
| MM | 03, 09, 10, ... | 2 digits month number | both |
| M | 3, 9, 10, ... | month number | both |
| DDDD | 09 | day of year | format |
| DDD | 9 | day of year | format |
| DD | 03, 09, 10, 17, ... | 2 digits day of month | both |
| D | 3, 9 ,10, 17 | day of month | both |
| WW | 01, 03, 24, 33, ... | week of year | format |
| W | 1, 3, 24. 33, ... | week of year | format |
| dddd | Saturday, Sunday, Monday, ... | week day name | format |
| ddd | Sat, Sun, Mon, ... | week day short name | format |
| dd | 01,02,...,07 | 2 digits week day number | format |
| d | 1,2,...,7 | week day number | format |
| HH | 03, 09, 10, 17,... | 2 digits hour (24 hour mode) | both |
| H | 3, 9, 10, 17,... | hour (24 hour mode) | both |
| hh | 03, 09, 10, 17,... | 2 digits hour (12 hour mode) | both |
| h | 3, 9, 10, 17,... | hour (12 hour mode) | both |
| mm | 03, 09, 10, 17,... | 2 digits minute | both |
| m | 3, 9, 10, 17,... | minute | both |
| ss | 03, 09, 10, 17,... | 2 digits second | both |
| s | 3, 9, 10, 17,... | second | both |
| SSS | 100 | 3 digits millisecond | both |
| SS | 10 | 2 digits millisecond | both |
| S | 1 | 1 digit millisecond | both |
| A | AM | meridiem | both |
| a | am | meridiem lowercase | both |