NSDateComponents issue - set incorrect day

Question

There are many issues similar to mine, but something goes wrong. Why function setDay sets to 1 day less? Where did I go wrong?

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDate *today = [NSDate date];
NSLog(@"today date = %@", today);
NSDateComponents *components = [calendar components:(NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear ) fromDate:today];
[components setDay:1];
NSLog(@"modified date = %@", [calendar dateFromComponents:components]);

Log:

today date = 2016-07-04 10:01:30 +0000
modified date = 2016-06-30 21:00:00 +0000

Modified date should be 2016-07-01

I think its actually 2016-07-01 but at midnight – Hossam Ghareeb Jul 04 '16 at 10:10 — Hossam Ghareeb, Jul 04 '16 at 10:10
Your time zone is UTC+3, isn't it? – vadian Jul 04 '16 at 10:17 — vadian, Jul 04 '16 at 10:17

score 1 · Accepted Answer · edited May 23 '17 at 11:52

1

Likely it is 2016-07-01, 24:00 GMT. NSLog() prints it out for GMT, not your locale time.

See here: Unexpected value from NSDate

edited May 23 '17 at 11:52

Community

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answered Jul 04 '16 at 10:11

Amin Negm-Awad

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Thank you, it solve my problem - [calendar setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; – Алексей Алыбин Jul 04 '16 at 10:28

score 1 · Answer 2 · answered Jul 04 '16 at 10:15

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You should add NSCalendarUnitHour in NSDateComponents like this then then you get correct date

NSDateComponents *components = [calendar components:(NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear |NSCalendarUnitHour) fromDate:today];

answered Jul 04 '16 at 10:15

kirti Chavda

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Thank you for your answer, it solves my problem – Алексей Алыбин Jul 04 '16 at 10:31
@АлексейАлыбин accept my answer and upvote me – kirti Chavda Jul 04 '16 at 10:49

score 0 · Answer 3 · answered Jul 04 '16 at 10:26

Try this code:

NSDateFormatter* df = [[NSDateFormatter alloc] init];    
[df setTimeZone:[NSTimeZone defaultTimeZone]];    // your time 00:00:00
[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSLog(@"modified date = %@", [df stringFromDate:[calendar dateFromComponents:components]]);  // Date format NSString

NSDateComponents issue - set incorrect day

3 Answers3