What is causing me to encounter an additional hour when computing time differences in JavaScript?

I am attempting to create a simple time difference calculation by subtracting the end time from the start time. However, I am noticing that I am getting an extra hour in my result. I believe this may be due to my timezone being GMT+1.

Regardless of the timezone issue, the time difference should remain accurate as both start and end times are in the same time zone.

You can view my code example in action here:

http://jsfiddle.net/kaze72/Rm3f3/

$(document).ready(function() {
    var startTime = (new Date).getTime();

    $("#endTime").click(function() {
        var endTime = (new Date).getTime();
        var difference = new Date(endTime - startTime);
        console.log(difference.getUTCHours() + ":" +
                difference.getUTCMinutes() + ":" +
               difference.getUTCSeconds());  
        console.log(difference.toLocaleTimeString());
    });
})
javascripttime

Answer №1

Understanding the representation and storage of dates in a Date object is crucial. Each Date acts as a wrapper around the number of milliseconds since 1970, also known as epoch time. When you subtract one date from another, you are not obtaining a new date but rather the difference in milliseconds between them.

One particular line in the code lacks coherence:

var diff = new Date(nu - tid1);

The correct approach should be:

var diffMillis = nu - tid1;

After calculating the difference in milliseconds, you can proceed to extract seconds, minutes, etc. as follows:

var seconds = Math.floor(diffMillis / 1000);
var secondsPart = seconds % 60;
var minutes = Math.floor(seconds / 60);
var minutesPart = minutes % 60;
var hoursPart = Math.floor(minutes / 60);
//...
console.log(hoursPart + ":" + minutesPart + ":" + secondsPart);

You can view a working example on JSFiddle.

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