Re: Determining user's clock preference on iOS
Re: Determining user's clock preference on iOS
- Subject: Re: Determining user's clock preference on iOS
- From: Rick Mann <email@hidden>
- Date: Thu, 23 Feb 2012 13:52:44 -0800
Oh, "j" works on iOS if you pass it to -dateFormatFromTemplate:options:locale:, but only if you pass [NSLocale currentLocale] and not nil.
On Mac OS X, the 12/24-hour format in the Clock is different than in the International settings. Changing the clock has no effect, but I haven't verified that changing the time format does.
--
Rick
On Feb 23, 2012, at 11:37 , Dave DeLong wrote:
>
> On Feb 23, 2012, at 8:21 AM, Kyle Sluder wrote:
>
>> On Feb 22, 2012, at 10:50 PM, Rick Mann <email@hidden> wrote:
>>
>>> I have a need to format times as either
>>>
>>> 24:mm
>>>
>>> or
>>>
>>> 12:mm
>>> am
>>>
>>> That is, if the user prefers a 24-hour clock, I want it to appear on a single line. If the user prefers a 12-hour clock, I want the AM/PM designator to be rendered underneath the time (in smaller type).
>>>
>>> Unfortunately, there's no format specifier for the hours of the day that indicates "use the user's preferred format."
>>
>> What happens if you give +[NSDateFormatter dateFormatFromTemplate:options:locale:] a template that contains "h:m:s a"? Does it rewrite it to "H:m:s" if the current locale uses 24-hour time?
>
> If you're going to go with this route, you'd need to use "j:m:s". According to The Spec (http://unicode.org/reports/tr35/#Date_Format_Patterns), "use of 'j' in a skeleton passed to an API is the only way to have a skeleton request a locale's preferred time cycle type (12-hour or 24-hour)."
>
> Cheers,
>
> Dave
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