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objective-cnsdatenscalendar

NSCalendar components:fromDate: not filling NSCalendarUnitHour

I have a call to NScalendar components:fromDate: that fills all the values specified in the listed components except for NSCalendarUnitHour. Can anyone help me find out why?

NSCalendar* _cal = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
[_cal setTimeZone:[NSTimeZone localTimeZone]];
NSDateComponents* resultComponents = [_cal components:NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitMonth fromDate:result]; 
//result is 2018-03-18 05:48:36 +0000

//resultComponents 
//<NSDateComponents: 0x60400014f0a0>
//Month: 3
//Leap month: no
//Day: 18
//Hour: 0
//Minute: 48

Why would Hour be set to 0?

Solution

  • The questions from @rmaddy and @Ken Thomases alerted me to the fact that my question did not take into account my current -5 timezone. I thought my timezone was -6 and so I was expecting any value other than 0. (Happy daylight savings...)

    My solution to not worry about changing timezones was to change to this:

    [_cal setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];