iOS - Difference between two times (ignore dates)

Question

How can I find the difference between two NSDates but ignore the date and only care about the time?

So far, I've found lots of solutions to calculate the difference between NSDates but none that ignore the date and only care about the time.

e.g., The difference betweeen 01/01/01 04:35 PM and 01/09/09 04:36 PM is 1 minute

score 1 · Answer 1 · answered Apr 27 '14 at 21:21

As with everything date calculation related on iOS, NSCalendar has got you covered! Specifically, you want to use components:fromDate:toDate:options: and pass NSWrapCalendarComponents as the option, which will prevent overflowing of components into the higher date components.

Vlad Papko · Answer 2 · 2014-04-27T21:37:48.093

0

Try this:

int (^timeFromDate)(NSDate *) = ^(NSDate *date) {
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *components = [calendar components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit
                                               fromDate:date];

    return (components.hour * 60 + components.minute) * 60 + components.second;
};
int diff = timeFromDate(date1) - timeFromDate(date2);

edited Apr 27 '14 at 21:37

answered Apr 27 '14 at 21:30

Vlad Papko

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The sum `components.hour + components.minute + components.second` makes no sense. – Jesse Rusak Apr 27 '14 at 21:33
@JesseRusak why? please explain? – Vlad Papko Apr 27 '14 at 21:34
So, the time 3:41:22 would return 3 + 41 + 22 = 66. How does that help? – Jesse Rusak Apr 27 '14 at 21:36
If anything, it should be: `return components.hour * 3600 + components.minute * 60 + components.second;` – rmaddy Apr 27 '14 at 21:36
@JesseRusak you are right, my fault, I've updated answer. – Vlad Papko Apr 27 '14 at 21:38

iOS - Difference between two times (ignore dates)

2 Answers2