js unixTime

unixtime.js

// return the date as a unix time timestamp.
Date.prototype.getUnixTime = function() { return this.getTime()/1000|0 };

if(!Date.now) Date.now = function() { return new Date(); }
Date.time = function() { return Date.now().getUnixTime(); }

var currentUnixTime = Date.time();
currentUnixTime = Date.now().getUnixTime(); // same as above

// Parse a date and get it as Unix time
var parsedUnixTime = new Date('Mon, 25 Dec 2016 13:30:00 GMT').getUnixTime();