Something wrong with nscalendar

Question

I can't understand what happening here :( :

NSLog(@"date : %@, hours : %d", self.now, [[self.calendar components:NSHourCalendarUnit fromDate:self.now] hour]);

result

date : 2000-01-01 01:00:19 +0000, hours : 2

Why is it not hours : 1 ? An idea ?

EDIT:

self.calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

and self.now is just a date.

Could you provide code where you initialize `calendar` and `now` objects? — Vlad Papko, Apr 23 '14 at 15:13
`NSLog(@"date : %@", date)` prints the date in GMT. `[calendar components:...]` uses your current time zone. — Martin R, Apr 23 '14 at 15:15

Vlad Papko · Accepted Answer · 2014-04-23T16:45:03.107

From Apple docs:

Returns the number of hour units for the receiver.
- (NSInteger)hour 
Return Value: The number of hour units for the receiver.

Discussion: This value is interpreted in the context of the calendar with which it is used

Calendar context makes hour component depending on time zone that set to calendar object.
When you init calendar by calling
[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
it automatically retrieve time zone from device settings.

In log we see GMT+0 time zone (2000-01-01 01:00:19 +0000). I guess your time zone is GMT+1. In this case NSCalendar works correctly.

Thanks ! I thought NSCalendar wasn't depending of the time zone — Nicolas Bonnet, Apr 24 '14 at 06:44

Something wrong with nscalendar

1 Answers1