How to know if two NSDate are in the same day

Question

Do you know how to know if two NSDate are the same day. I want to take into account the locale...

It could be easy to use a timeIntervalSinceDate: but Monday 23H58 and Tuesday 00H01 are not in the same day...

Dealing with NSDate and locale for calculation is not very easy.

Answer 1

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *componentsForFirstDate = [calendar components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:firstDate];

NSDateComponents *componentsForSecondDate = [calendar components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:secondDate];

if ([componentsForFirstDate year] == [componentsForSecondDate year])

etc.

I don't know if isEquals would do what you want on NSDateComponents.

Answer 2

Since iOS 8 this is straightforward:

let isSameDay = NSCalendar.currentCalendar().isDate(date1, inSameDayAsDate: date2)

and it becomes a little simpler yet with Swift 3:

let isSameDay = Calendar.current.isDate(date1, inSameDayAs: date2)

Answer 3

Use NSCalendar and NSDateComponents for that:

NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *comps1 = [cal components:(NSMonthCalendarUnit| NSYearCalendarUnit | NSDayCalendarUnit) 
                                      fromDate:date1];
NSDateComponents *comps2 = [cal components:(NSMonthCalendarUnit| NSYearCalendarUnit | NSDayCalendarUnit) 
                                      fromDate:date2];


BOOL sameDay = ([comps1 day] == [comps2 day] 
                  && [comps1 month] == [comps2 month] 
                  && [comps1 year] == [comps2 year]);

Answer 4

Swift:

func isSameDays(date1:NSDate, _ date2:NSDate) -> Bool {
    let calendar = NSCalendar.currentCalendar()
    var comps1 = calendar.components([NSCalendarUnit.Month , NSCalendarUnit.Year , NSCalendarUnit.Day], fromDate:date1)
    var comps2 = calendar.components([NSCalendarUnit.Month , NSCalendarUnit.Year , NSCalendarUnit.Day], fromDate:date2)

    return (comps1.day == comps2.day) && (comps1.month == comps2.month) && (comps1.year == comps2.year)
}