Number of hours between two strings in Javascript

Question

I have 2 strings "18:13:10" and "15:45:11" , I need to compute the number of hours between them ? For example a result of 6 hours and 17 minutes.

I'am working with reactjs.

Thanks

Duplicate of Converting a time string to a time value in javascript and How to get the hours difference between two date objects? — Heretic Monkey
– Heretic Monkey, Commented Mar 20, 2020 at 16:10
How is there "6 hours and 17 minutes" between 18:13:10 and 15:45:11? — Heretic Monkey
– Heretic Monkey, Commented Mar 20, 2020 at 16:32
Does this answer your question? Javascript return number of days,hours,minutes,seconds between two dates — Heretic Monkey
– Heretic Monkey, Commented Mar 20, 2020 at 16:34

terrymorse · Accepted Answer · 2020-03-20 20:07:14Z

1

Let Date() do the heavy lifting for you:

    const d1 = new Date('1970-01-01T' + "18:13:10" + 'Z');
    const d2 = new Date('1970-01-01T' + '15:45:11' + 'Z');
    const diff = d1 - d2; // 887900

The time difference is in milliseconds. To get hours and minutes and seconds:

    const hours = Math.floor(diff/(1000*60*60)); // 2
    const mins = Math.floor((diff-(hours*1000*60*60)) / (1000*60)); // 27
    const secs = Math.floor(
      (diff-(hours*1000*60*60)-(mins*1000*60)) / 1000); // 59

edited Mar 20, 2020 at 20:07

answered Mar 20, 2020 at 16:01

terrymorse

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7 Comments

xgeek652 Over a year ago

I tried to change 887900 ms to hours using this : timecalculator.net/milliseconds-to-hours and the result is 0.24 hours

Heretic Monkey Over a year ago

You need to have the next day in d2.

HMR Over a year ago

@xgeek95 const hours = Math.floor(ms/(1000*60*60)) and const minutes = Math.floor(ms/(1000*60))

terrymorse Over a year ago

@HereticMonkey Why use a different day for d2? The question does not specifiy a different day.

Heretic Monkey Over a year ago

Well, the expected outcome, "6 hours and 17 minutes" does not appear to square with the difference between 15:45 and 18:13 if they are on the same day (that would be 2 hours and 27 minutes). But it doesn't square going the other way either, so who knows?

|

koalaok · Accepted Answer · 2020-03-20 16:39:44Z

0

Just create two instances of Date object prepending a date to the full time string. Use getTime and calculate the time difference. Then use getHours getMinutes and getSeconds methods on Date difference.

	const d1 = new Date('1970-01-01 ' + "18:13:10");
	const d2 = new Date('1970-01-01 ' + '10:01:01');

	var difference = d1.getTime() - d2.getTime();

	console.log(new Date(difference).getHours()-1 + ' ' + new Date(difference).getMinutes()+ ' ' + new Date(difference).getSeconds())

edited Mar 20, 2020 at 16:39

answered Mar 20, 2020 at 16:17

koalaok

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2 Comments

Heretic Monkey Over a year ago

Questions which explain code are downvoted less often that just a dump of code, especially when that code uses different values than the OP.

koalaok Over a year ago

Oh really? Just edit my answer btw. Added some explanation to my dump of code.

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