How to compute the timestamp in JavaScript
Many sources use the term timestamp to refer specifically to Unix time, the number of seconds since 00:00:00 UTC on January 1, 1970. In JavaScript you can use the built-in object Date to compute this timestamp. Here follows an example:
var ts = Date.UTC('2007', '09', '28') / 1000; alert(ts); The previous code displays an alert with the number of seconds between 00:00:00 UTC on January 1, 1970 and 00:00:00 UTC on October 28, 2007.