I'm not the original author of this thread, but I submitted a bug back in 
August 2010 about these issues. It was marked as a duplicate and I've never 
heard anything more. Perhaps I don't know how to properly follow duplicates. My 
bug # is 8320528.

Dave


On Jan 14, 2011, at 4:34 PM, Deborah Goldsmith wrote:

> Did you write a bug for this? What is the bug number?
> 
> Thanks,
> Deborah Goldsmith
> Apple Inc.
> 
> On Jan 10, 2011, at 10:12 AM, Steve Mykytyn wrote:
> 
>> UIDatePicker (4.2.1) shows differing dates for the modes 
>> 
>> UIDatePickerDate (correct),  and
>> 
>> UIDatePickerDateAndTime (incorrect) 
>> 
>> when the timezone you assign to the UIDatePicker is 
>> 
>> - more than 12 hours ahead (east) of the systemTimeZone of the iPhone.
>> 
>> For example, 
>> 
>> device system time zone = America/Los Angeles = GMT - 8
>> 
>> Honolulu date: Dec 7, 1941 7:48am
>> 
>> Tokyo date: Dec 8, 1941 3:18am
>> 
>> UIDatePicker will show the Tokyo date for mode
>> 
>> UIDatePickerDate (correct): Dec 8, 1941
>> 
>> UIDatePickerDateAndTime: Dec 7, 1941
>> 
>> In fact, UIDatePicker will show incorrect dates in this case for any time 
>> zone east of GMT + 4 (always one day before correct day)
>> 
>> 
>> A work-around in viewDidLoad is:
>> 
>>      self.datePicker.datePickerMode = UIDatePickerModeDateAndTime;   
>>      
>>      self.datePicker.minuteInterval = 1;
>> 
>>      self.datePicker.timeZone = timeZone;
>>      
>>      [NSTimeZone setDefaultTimeZone:timeZone];  //  *** add this line to 
>> force date picker to show correct date in all modes
>>              
>>      [self.datePicker setDate:tzDate animated:YES];  
>> 
>> and in viewWillDisappear add:
>> 
>>      [NSTimeZone resetSystemTimeZone];
>> 
>>      [NSTimeZone setDefaultTimeZone:[NSTimeZone systemTimeZone]];
>> 
>> Not super happy about the work-around, but it should be fairly robust even 
>> if this bug is fixed in future.
>> 
>> If anyone can shed some light on this behavior, please advise.  No amount of 
>> fooling around with calendars, locales, etc. fixed this until i reset the 
>> default zone.
>> 
>> 
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