Subtracting time in swift

Question

I have 2 NSDate object thats shows 24hour time. Is there a way I can subtract those two times and put the result in a label. Ive searched for a method but couldn't find one. The only thing I could find was cover it to a double with timeIntervalFromDate method, which returns a double and I need the 24hour representation of that.

score 1 · Answer 1 · answered Jun 30 '15 at 19:55

1

It just returns an NSTimeInterval that is typedef double NSTimeInterval is a representation in seconds.
Doing the math to know how may hours are in x seconds, you just need to divide the retuned interval to 3600 seconds and round the result.
I've build a simple extension to be used in swift to help in calendrical calculation, you can find it here: AFSwiftDateExtension

answered Jun 30 '15 at 19:55

Andrea

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I did try this and it works fine, I just have a small bug, where if its a straight hour difference its calculating 59 minutes instead – user3275730 Jun 30 '15 at 20:35
Probably this is beach it also takes into account milliseconds – Andrea Jul 01 '15 at 06:23

score 0 · Answer 2 · edited May 23 '17 at 11:51

0

This function may solve your problem:

func hoursFrom(earlierDate : NSDate, laterDate:NSDate) -> Int
{
        return NSCalendar.currentCalendar().components(NSCalendarUnit.CalendarUnitHour, fromDate: earlierDate, toDate: laterDate, options: nil).hour
}

Adapted from this related question.

edited May 23 '17 at 11:51

Community

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answered Jun 30 '15 at 18:33

Leonardo Yvens

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score 0 · Answer 3 · answered Jun 30 '15 at 22:21

0

extension NSTimeInterval {
    var time:String {
        return String(format:"%02d:%02d:%02d", Int((self/3600.0)%24), Int((self/60.0)%60), Int((self)%60))
    }
}

println(30.time)    // "00:00:30"
println(60.time)    // "00:01:00"
println(600.time)   // "00:10:00"
println(3600.time)  // "01:00:00"

answered Jun 30 '15 at 22:21

Leo Dabus

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That's neat. Would add some handling for negative values. – Eiko Jun 30 '15 at 22:30
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@Eiko you can use abs(-30.0).time // "00:00:30" – Leo Dabus Jun 30 '15 at 22:31

Subtracting time in swift

3 Answers3