How can I write a script to detect when a user changes their system time in JS?
You can use the SystemEvents. TimeChanged event to detect the time changed. However, this will only fire if you have a messagepump running - this is fine for windows client applications, but not so much for most server applications (like services, web apps, etc). Otherwise you can use Environment.
Yes, it uses the system time on the client side.
To check if a date is between two dates: Use the Date() constructor to convert the dates to Date objects. Check if the date is greater than the start date and less than the end date. If both conditions are met, the date is between the two dates.
There is no (portable) way to track a variable in JavaScript. Also, date information does not lie in the DOM, so you don't get the possibility of a DOM event being triggered.
The best you can do is to use setInterval
to check periodically (every second?). Example:
function timeChanged(delta) {
// Whatever
}
setInterval(function timeChecker() {
var oldTime = timeChecker.oldTime || new Date(),
newTime = new Date(),
timeDiff = newTime - oldTime;
timeChecker.oldTime = newTime;
if (Math.abs(timeDiff) >= 5000) { // Five second leniency
timeChanged(timeDiff);
}
}, 500);
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