How to get milliseconds in Javascript

Both return the number of milliseconds since January 1, 1970, 00:00:00 UTC.

For example, Using Date.now():

let currentMilliseconds = Date.now();
console.log(currentMilliseconds);

For example, Using new Date() and getTime():

let currentMilliseconds = new Date().getTime();
console.log(currentMilliseconds);

Both Date.now() and getTime() output the current time in milliseconds.