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Asked: 2026-05-10T16:34:30+00:00

I’m trying to determine if the user is using 24 hour or 12 hour

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I’m trying to determine if the user is using 24 hour or 12 hour time, and there doesn’t seem to be a good way to figure this out other than creating an NSDateFormatter and searching the format string for the period field (‘a’ character)

Here’s what I’m doing now:

NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setTimeStyle:NSDateFormatterShortStyle]; NSRange range = [[formatter dateFormat] rangeOfString:@'a']; BOOL is24HourFormat = range.location == NSNotFound && range.length == 0; [formatter release];

Which works, but feels kinda fragile. There has to be a better way, right?

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1 Answer

  1. This information is provided in NSUserDefaults. Maybe under the NSShortTimeDateFormatString key? (Still requires parsing of course).

    (Use

    NSLog(@'%@', [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);

    to dump all the pre-defined user defaults).

    Not quite sure why you want to do this – I bet you have a good reason – but maybe it’s best just to use the defaults in NSDateFormatter instead?

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