Javascript - Date getTime() Method

The getTime() method returns the number of milliseconds between midnight of January 1, 1970 and the date object.

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Description

The getTime() method returns the number of milliseconds between midnight of January 1, 1970 and the date object.

Syntax 

Date.getTime()

Parameters

None

Return

A Number, representing the number of milliseconds since midnight January 1, 1970

Example

Return the number of milliseconds since 1970/01/01:

Demo

//The internal clock in JavaScript starts at midnight January 1, 1970.
//display the number of milliseconds since midnight, January 1, 1970.

var d = new Date();
var n = d.getTime();
console.log(n);/*  w  w w  .j  a v  a2 s . c  om*/

Result

Calculate the number of years since 1970/01/01:

Demo

//calculate the number of years since midnight, January 1, 1970.

var minutes = 1000 * 60;
var hours = minutes * 60;
var days = hours * 24;
var years = days * 365;
var d = new Date();
var t= d.getTime();

var y = Math.round(t / years);
console.log(y);//from w ww  . j  a  v a  2 s .com

Result