JavaScript NTP time

Question

I\'m writing a counting script who counts the time between an old date and today.
Everything worked good until I tested on a computer with wrong date and saw the resul

Answer 1

put this right at the top of your document:

var clientTime = new Date();

and this right at the bottom of your document:

var serverTime = new Date("");
var deltaTime = serverTime - clientTime; // in milliseconds (expected accuracy: < 1 second)

then, if you need to know the duration of something:

var startTime = new Date();

// [processing...]

var endTime = new Date();
var duration = endTime - startTime; // in milliseconds
var startTimeServer = startTime + deltaTime;
var endTimeServer = endTime + deltaTime;