Returns the numeric value corresponding to the time for the specified date according to universal time.
|ECMAScript Edition||ECMAScript 1st Edition|
The value returned by the
getTime method is the number of milliseconds since 1 January 1970 00:00:00 UTC. You can use this method to help assign a date and time to another
This method is functionally equivalent to the valueOf method.
Using getTime for copying dates
Constructing a date object with the identical time value.
var birthday = new Date(1994, 12, 10); var copy = new Date(); copy.setTime(birthday.getTime());
Measuring execution time
Subtracting two subsequent getTime calls on newly generated Date objects, give the time span between these two calls. This can be used to calculate the executing time of some operations.
var end, start; start = new Date(); for (var i = 0; i < 1000; i++) Math.sqrt(i); end = new Date(); console.log("Operation took " + (end.getTime() - start.getTime()) + " msec");