I\'m creating a UIDatePicker programmatically, and setting its locale with the following code:
datePicker.locale = [[[NSLocale alloc] initWithLocaleIdentifier:@\
Try changing the locale of the UIDatePicker's calendar as well:
NSLocale *locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"es_ES"] autorelease];
datePicker.locale = locale;
datePicker.calendar = [locale objectForKey:NSLocaleCalendar];
As answered here Can I localize a UIDatePicker?, the picker display depends on country settings, not on language settings.
In your example you are changing the language locale only.