how to define the date format in Date in js? code example

Example 1: format date js

var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
var today  = new Date();

console.log(today.toLocaleDateString("en-US")); // 9/17/2016
console.log(today.toLocaleDateString("en-US", options)); // Saturday, September 17, 2016

 // For custom format use
 date.toLocaleDateString("en-US", { day: 'numeric' })+ "-"+ date.toLocaleDateString("en-US", { month: 'short' })+ "-" + date.toLocaleDateString("en-US", { year: 'numeric' }) // 16-Nov-2019

Example 2: javascript date format

const event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));

const options = {  year: 'numeric', month: 'short', day: 'numeric' };

console.log(event.toLocaleDateString('de-DE', options));
// expected output: Donnerstag, 20. Dezember 2012

console.log(event.toLocaleDateString('en-US', options));
// US format 


// In case you only want the month
console.log(event.toLocaleDateString(undefined, { month: 'short'}));
console.log(event.toLocaleDateString(undefined, { month: 'long'}));