Find elapsed time in javascript

Question

I\'m new to JavaScript and I\'m trying to write a code which calculates the time elapsed from the time a user logged in to the current time.

Here is my code:-

Answer 1

No offence, but this is massively over-enginered. Simply store the start time when the script first runs, then subtract that from the current time every time your timer fires.

There are plenty of tutorials on converting ms into a readable timestamp, so that doesn't need to be covered here.

    var start = Date.now();
    
    setInterval(function() {
      document.getElementById('difference').innerHTML = Date.now() - start;
    
      // the difference will be in ms
    }, 1000);