Number of days between two NSDates [duplicate]

Answer 1

Why not just:

int days = [date1 timeIntervalSinceDate:date2]/24/60/60;

Answer 2

Got one, not sure it's exactly what you want, but it could help some of you, (helped me!!)

My goal was to know if, between two date (less than 24h difference) i had a "overday" day+1:

i did the following (a bit archaic i admit)

NSDate *startDate = ...
NSDate *endDate = ...

NSDate already formatted by another NSDateFormatter (this one is just for this purpose :)

NSDateFormatter *dayFormater = [[NSDateFormatter alloc]init];
[dayFormater setDateFormat:@"dd"];

int startDateDay = [[dayFormater stringFromDate:startDate]intValue];

int endDateDay = [[dayFormater stringFromDate:dateOn]intValue];

if (endDateDay > startDateDay) {
    NSLog(@"day+1");
} else {
    NSLog(@"same day");
}

maybe something like this already exist, but didn't find it

Tim

Answer 3

I needed the number of days between two dates including the beginning day. e.g. days between 14-2-2012 and 16-2-2012 would produce a result of 3.

+ (NSInteger)daysBetween:(NSDate *)dt1 and:(NSDate *)dt2 {
        NSUInteger unitFlags = NSDayCalendarUnit;
        NSCalendar* calendar = [NSCalendar currentCalendar];
        NSDateComponents *components = [calendar components:unitFlags fromDate:dt1 toDate:dt2 options:0];
        NSInteger daysBetween = abs([components day]);
    return daysBetween+1;
}

Note that it doesn't matter in which order you provide the dates. It will always return a positive number.

Answer 4

NSDate *lastDate = [NSDate date];
NSDate *todaysDate = [NSDate date];
NSTimeInterval lastDiff = [lastDate timeIntervalSinceNow];
NSTimeInterval todaysDiff = [todaysDate timeIntervalSinceNow];
NSTimeInterval dateDiff = lastDiff - todaysDiff;

dateDiff will then be the number of second between the two dates. Just divide by the number of seconds in a day.

Answer 5

Why note use the following NSDate method:

- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)anotherDate

This will return the number of seconds between your two dates and you can divide by 86,400 to get the number of days !!

Answer 6

Here's the best solution I've found. Seems to utilize the Apple approved method for determining any amount of units between NSDates.

- (int)daysBetween:(NSDate *)dt1 and:(NSDate *)dt2 {
    NSUInteger unitFlags = NSDayCalendarUnit;
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 
    NSDateComponents *components = [calendar components:unitFlags fromDate:dt1 toDate:dt2 options:0];
    return [components day]+1;
}

E.g. if you want months as well, then you could include 'NSMonthCalendarUnit' as a unitFlag.

To credit the original blogger, I found this info here (although there was a slight mistake that I've fixed above): http://cocoamatic.blogspot.com/2010/09/nsdate-number-of-days-between-two-dates.html?showComment=1306198273659#c6501446329564880344