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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