MockTheClock/example_simple_spoof.html at master · zb3/MockTheClock · GitHub

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<!DOCTYPE html>
<html>

<!--
include this file as soon as possible, otherwise it may not work if the app manages to store references
to the original functions!
-->
<script src="js/MTC.js"></script>
<body>
Open JS console for fun :)
</body>

<script>
/*
in this example, we don't want to modify timers, we just want to go back in time
by 666000ms

NOTE: each time we go back, we need to clear intervals as those set in the future (before going back)
will not be executed
*/

var delta = 666000;
//turn spoofing on
MTC.toggleSpoofing(true);
MTC.setTime(MTC.real.dateNow()-delta);

//we still need to take care of the clock ourselves!
MTC.real.setInterval(function() {
  MTC.setTime(MTC.real.dateNow()-delta);
}, 10);

function timer() {
  console.log('date: ', Date());
  console.log('Date.now: ', Date.now());
  console.log('new Date(): ', new Date());
  console.log('Date delta', MTC.real.dateNow()-Date.now());
}

setInterval(timer, 1000);
</script>
</html>