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Javascript Timestamps

High-resolution timestamps

performance.now() returns a precise timestamp: The number of milliseconds, including microseconds, since the current web page started to load.

More generally, it returns the time elapsed since the performanceTiming.navigationStart event.


t = performance.now();

For example, in a web browser's main context, performance.now() returns 6288.319 if the web page began to load 6288 milliseconds and 319 microseconds ago.


Get Timestamp in Seconds

To get the timestamp in seconds


Math.floor((new Date().getTime()) / 1000)

Output


Low-resolution timestamps

Date.now() returns the number of whole milliseconds that have elapsed since 1 January 1970 00:00:00 UTC


t = Date.now();

Output

Date.now() returns 1461069314 if it was called on 19 April 2016 at 12:35:14 GMT

Support for legacy browsers

In older browsers where Date.now() is unavailable, use (new Date()).getTime() instead:


t = (new Date()).getTime();

Or, to provide a Date.now() function for use in older browsers, use this polyfill:


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


Conclusion

In this page (written and validated by ) you learned about Javascript Timestamps . What's Next? If you are interested in completing Javascript tutorial, your next topic will be learning about: Javascript Promises.



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