Time minus time in javascript

Question

I like to substract time in javascript. I tried various methods, but none of them works.

For example:

var endtime = "22:30" // time-range 00 to 24 hours
var time_difference = "2:30" // time to substract from endtime
// wanted result: starttime = "20:00" // time

How can i fix this with javascript?

@Guido Lemmens 2: just convert those time strings into number of seconds and subtract. — zerkms, Jun 29 '15 at 00:48
@zerkms : thanks, i converted the time strings into numbers of seconds en substracted them... that did the trick easy! — Guido Lemmens 2, Jun 29 '15 at 22:41

score 0 · Answer 1 · answered Jun 29 '15 at 00:37

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Using moment.js:

var endtime = moment({hour: 22, minute: 30});
endtime.subtract(2, 'hours');
endtime.subtract(30, 'minutes');
var result = endtime.format('H:mm');

answered Jun 29 '15 at 00:37

mostruash

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Nice one down voter! You are so `1337`. – mostruash Jun 29 '15 at 00:39
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Was not a downvoter, but your solution may produce wrong results when it's time saving day. It's generally a terrible (or even stupid?) idea to treat time as a date. – zerkms Jun 29 '15 at 00:45
@zerkms You can basically base it on a date + timezone in the past that you are sure has nothing to do with timesaving days/leap years/leap seconds. – mostruash Jun 29 '15 at 01:17
You can, until you do that - your solution may produce incorrect results (and your answer is still incorrect due to that). – zerkms Jun 29 '15 at 01:18

score 0 · Answer 2 · answered Jun 29 '15 at 00:41

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Try using moment.js moment().subtract() method...

http://momentjs.com

answered Jun 29 '15 at 00:41

temarsden

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Time minus time in javascript

2 Answers2