The Intl.DateTimeFormat format() method in JavaScript formats dates and times according to a specified locale and options. It allows you to customize the output with settings for timezone, date, time, and more, making it ideal for creating locale-sensitive and readable date-time strings.

Syntax: 

Intl.dateTimeFormat.format( date )

Parameters: This method accepts a single parameter as mentioned above and described below: 

• date: This parameter holds the date which needs to format.

The below examples illustrate the Intl.DateTimeFormat.prototype.format() method in JavaScript:

Example 1: In this example, we will print the specific dates, and days in three different languages and one modified pattern.

const Geeks = {
    weekday: 'long', year:
        'numeric', month: 'long', day: 'numeric'
};
const dateformat = new Date(1997, 06, 30);

const dateTimeFormat4 = new Intl.DateTimeFormat('hi', Geeks);
console.log(dateTimeFormat4.format(dateformat));

const dateTimeFormat2 = new Intl.DateTimeFormat('en-GB', Geeks);
console.log(dateTimeFormat2.format(dateformat));

const dateTimeFormat1 = new Intl.DateTimeFormat('sr-RS', Geeks);
console.log(dateTimeFormat1.format(dateformat));

const dateTimeFormat3 = new Intl.DateTimeFormat('en-US', Geeks);
console.log(dateTimeFormat3.format(dateformat));

Output:

"बुधवार, 30 जुलाई 1997"
"Wednesday, 30 July 1997"
"среда, 30. јул 1997."
"Wednesday, July 30, 1997"

Example 2: In this example, we will print the specific dates, and days in three different languages.

let list = [new Date(2012, 08), new Date(2012, 11),
new Date(2012, 03)];
let geeks = { year: 'numeric', month: 'long' };

let dateTime = new Intl.DateTimeFormat('hi', geeks);
let result = list.map(dateTime.format);
console.log(result.join(' <-> '));

let dateTime1 = new Intl.DateTimeFormat('tr', geeks);
let result1 = list.map(dateTime1.format);
console.log(result1.join(' ; '));

let dateTime2 = new Intl.DateTimeFormat('LT', geeks);
let result2 = list.map(dateTime2.format);
console.log(result2.join(' :: '));

Output:

"सितंबर 2012 <-> दिसंबर 2012 <-> अप्रैल 2012"
"Eylül 2012 ; Aralık 2012 ; Nisan 2012"
"2012 m. rugsėjis :: 2012 m. gruodis :: 2012 m. balandis"

We have a complete list of Javascript Intl methods, to check those please go through the Javascript Intl Complete Reference article.

Supported Browsers: The browsers supported by Intl.DateTimeFormat.prototype.format() method are listed below: 

• Google Chrome
• Edge 
• Firefox
• Opera
• Safari