How to remove the decimals(milliseconds) from Elapsed time in Javascript?

Question

I have an elapsed time functionality but the elapsed time gets printed in decimals. Example 10.102 seconds when I want it to be just 10 seconds. How do I achieve that?

var startTime = new Date();


//Stopwatch 
sleep (30000);
var endTime = new Date();
var seconds = (endTime.getTime() - startTime.getTime()) / 1000;
print("Elapsed Time is " + seconds + " seconds");

The `Math.round()` function will never return a value with a fractional part. — Pointy, Jan 21 '21 at 14:20
You can find it here: https://stackoverflow.com/questions/11832914/round-to-at-most-2-decimal-places-only-if-necessary — Ali Esmailpor, Jan 21 '21 at 14:23
@Pointy sorry, i realised that it was the wrong code, I have edited the question! — confusedreally, Jan 21 '21 at 14:25
@AliEsmailpor I'm very new. Where exactly would i use Math.round? — confusedreally, Jan 21 '21 at 14:26
Just use `Date.now()` over creating a new date object then converting to an epoch timestamp. — Nick, Jan 21 '21 at 14:27
@Alex where exactly? I edited the question, so I don't know if you're answering for the previous code or this one — confusedreally, Jan 21 '21 at 14:28
The code you originally had was producing the correct answer, once you swapped out `new Date()` with `Date.now()`. Why did you change it? — Nick, Jan 21 '21 at 14:28

score 0 · Answer 1 · answered Jan 21 '21 at 14:28

I really love this method of displaying my time from seconds -> 00:00:00 or 00:00 or 00; some more formatting needed.

    function ToHHMMSS(secs) {
        let sec_num = parseInt(secs, 10);
        let hours = Math.floor(sec_num / 3600);
        let minutes = Math.floor(sec_num / 60) % 60;
        let seconds = sec_num % 60;
        return [hours, minutes, seconds].map(t => t < 10 ? "0" + t : t).filter((t, i) => t !== "00" || i > 0).join(":");
    }

    console.log(ToHHMMSS(10.2));
    console.log(ToHHMMSS(10.32));
    console.log(ToHHMMSS(10.2));
    console.log(ToHHMMSS(11110.2));
    console.log(ToHHMMSS(10.2));
    console.log(ToHHMMSS(310.2));
    console.log(ToHHMMSS(120.2));

score 0 · Answer 2 · answered Jan 21 '21 at 14:29

I would look into learning some JavaScript. There are a ton of free resources.

var startTime = new Date();


function timer() {
  var endTime = new Date();
  var timeDiff = endTime - startTime;
  timeDiff /= 1000;
  var seconds = Math.round(timeDiff % 60);
  console.log("Elapsed Time is " + seconds + " seconds");
}


//Stopwatch 
setTimeout(timer, 2523);

h0ly · Answer 3 · 2021-01-21T15:01:21.463

0

Use parseInt() to keep the seconds only.

let date1 = new Date();
let date2 = new Date();
date1.setMilliseconds(date1.getMilliseconds() - 3712);
let diff = date2 - date1; // in ms

console.log(date1.getTime());
console.log(date2.getTime());
console.log(`${parseInt(diff / 1000)} seconds`); // "3 seconds"

edited Jan 21 '21 at 15:01

answered Jan 21 '21 at 14:56

h0ly

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How to remove the decimals(milliseconds) from Elapsed time in Javascript?

3 Answers3