How to get difference between two days in iPhone

Question

Hi All,

I would like to calculate the no of days,hours,minutes between two different dates in iPhone(Objective C). Please provide any code sample to do the same.

Thanks Sandeep

Answer 1

    NSCalendar* gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    unsigned int uintFlags = NSYearCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit;
    NSDateComponents* differenceComponents = [gregorian components:uintFlags fromDate:firstDate toDate:secondDate options:0];

then just check properties of differenceComponents. You can find all these properties in the documentation provided with XCode

Answer 2

If your dates are in NSDate objects, you can use the timeIntervalSinceDate method to find the difference as an NSTimeInterval, which will give you the difference in seconds.

You can then convert seconds to days, hours and minutes via a simple algorithm (this is off the top of my head and not tested):

minutes = seconds / 60;
seconds %= 60;
hours = minutes / 60;
minutes %= 60;
days = hours / 24;
hours %= 24;

Answer 3

Hi, I have written a comprehensive program to give the difference between two dates in C (dont know this is what you mean by Objective C). Please find the original work here.

http://www.technicalypto.com/2010/02/different-between-two-days-implemented.html