CODEWITHSUNDEEP
iosobjective-c
Ashish Agarwal
Ashish Agarwal

Reputation: 14925

iOS: Value of NSCalendarUnitWeekday is 1 for a Monday

I am trying to parse out the day of the week given a NSDate. 

NSDateComponents *comps = [[NSDateComponents alloc] init];
comps=[calendar components: NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear | NSCalendarUnitWeekOfMonth | NSCalendarUnitWeekOfYear | NSCalendarUnitWeekday fromDate:date];

When the value of date is 2015-11-30 00:58:52 +0000 (this is Monday), the value of comps.weekday is printed out as 1

When the value of date as 2015-11-15 09:59:46 +0000 (this is Sunday), the value of comps.weekday is also 1.

Upvotes: 3

Views: 1017

Answers (1)

Tim
Tim

Reputation: 4813

NSDateComponents uses the timezone of the NSCalendar to interpret the current day. NSCalendar defaults to the using the timezone of the device.

2015-11-30 00:58:52 UTC is only a Monday if you are in the UTC timezone, or one of the later ones. If you are in the EST (-5) timezone, then this would be a Sunday.

If you want to interpret the day of week at the UTC timezone then change the timeZone property to [NSTimezone timeZoneForSecondsFromGMT:0].

Documentation ref: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDateComponents_Class/#//apple_ref/occ/instp/NSDateComponents/timeZone

Upvotes: 5

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