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How to calculate elapsed time in JavaScript?

April 1, 2021

I am going to make use of same function I created in this post:

How to create a simple stopwatch using JavaScript?

Let’s modify the code in the post above slightly to get what we want.

HTML

We’re going to show hours, minutes and seconds elapsed. You can add microseconds as well, just like the stopwatch example or just keep minutes and seconds.

CSS

Let’s give it a nice look using CSS. It’s not required for background processing for e.g. if you want to keep track of user’s timing activities.

JavaScript

Finally, let’s add the modified JavaScript function.

Here’s the demo and JavaScript code.

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