javascript/timing

Question

I want to calculate the time difference between the click of two buttons using java script

Answer 1

Also consider performance.now() for higher resolution timing.

Answer 2

Here's a hint - use:

var t = Date.now();

to get the current time (measured in milliseconds since 00:00:00 UTC on 01/01/1970) with millisecond resolution.

Note that the result will still be limited in accuracy by the system hardware.

On older browsers without Date.now(), use:

var t = new Date().valueOf();

or the terser

var t = +new Date();

The latter uses numeric coercion (the + prefix) to generate an automatic call to .valueOf().

Answer 3

• Get current time from the epoch in milliseconds: new Date().getTime().
• Difference between times: endTime - startTime.
• Show message box: alert("Message").

Guess these can be combined together as needed.