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Re: 12 hr vs 24 hr time display
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Re: 12 hr vs 24 hr time display


  • Subject: Re: 12 hr vs 24 hr time display
  • From: "Gary L. Wade" <email@hidden>
  • Date: Tue, 03 Jan 2017 11:52:54 -0800

Is there a problem with using +[NSDateFormatter localizedStringFromDate:dateStyle:timeStyle:]?  Depending on your needs, you might also consider +[NSCalendar autoupdatingCurrentCalendar].

A user typically “sets” their region settings when they set up their Mac, and the choice of 12/24 hour display defaults to what the selected region uses.  Few people change things after that, although I am, preferring a four-digit year vs two-digit for the short date format.
--
Gary L. Wade
http://www.garywade.com/ <http://www.garywade.com/>
> On Jan 3, 2017, at 8:34 AM, Sandor Szatmari <email@hidden> wrote:
>
> Jeremy,
>
>> On Jan 3, 2017, at 10:30, Jeremy Pereira <email@hidden> wrote:
>>
>>
>>> On 3 Jan 2017, at 06:16, Sandor Szatmari <email@hidden> wrote:
>>>
>>> I am working on a small application where the primary function is to display the time to the user.  My hope was to honor the user's preference setting.  I am either missing something or honoring the user's preference is harder than expected.
>>>
>>> So, there are two places to set 24 hr time display.
>>>
>>> 1. Date & Time preference panel
>>> 2. Language & Region preference panel
>>>
>>> The cocoa frameworks react differently depending on where you set this.
>>>
>>> If set by method 1, cocoa frameworks seem unaware of this setting and it appears this is cosmetic in that it only affects the display of the clock in the NSStatusBar.
>>>
>>> If set by method 2, cocoa frameworks reflect this and the Date & Time setting is disabled noting that the setting has been overridden.
>>>
>>> So if a user uses method 1, potentially unaware of method 2, how should one go about determining the user's intentions.
>>
>> It seems obvious to me that method 1 only refers to the clock display in the menu bar and nothing else. It’s a sub setting of
>> “Show date and time in the menu bar”.
>>
>> If you honour whatever preference is set by method 2 as your code fragment below does, you’ll be fine.
>>
> I feel like fewer people use/find method 2, simply stopping at method 1.  This may be a gross assumption on my part.  Under my assumption they would simply think my app doesn't display 24 hr time or respect the system setting.  Am I being to sensitive here?
>
> Sandor
>>
>>>
>>> There are deprecated methods using: (didn't try, it's deprecated)
>>>  NSUserDefaults with the key NSShortTimeDateFormatString
>>>
>>> There are supported methods using: (works with method 2)
>>>  NSString *format = [NSDateFormatter dateFormatFromTemplate:@"j" options:0 locale:[NSLocale currentLocale]];
>>>  BOOL is24Hour = ([format rangeOfString:@"a"].location == NSNotFound);
>>>
>>> Can anyone provide any clarity here?
>>>
>>> Sandor
>>> _______________________________________________
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>>
>> --
>> Jeremy Pereira
>> email@hidden
>> 07884 265457

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  • Follow-Ups:
    • Re: 12 hr vs 24 hr time display
      • From: Sandor Szatmari <email@hidden>
References: 
 >12 hr vs 24 hr time display (From: Sandor Szatmari <email@hidden>)
 >Re: 12 hr vs 24 hr time display (From: Sandor Szatmari <email@hidden>)

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