Alex, > On Jan 3, 2017, at 19:51, Alex Zavatone <z...@mac.com> wrote: > > >> On Jan 3, 2017, at 3:02 PM, Sandor Szatmari wrote: >> >> Gary, >> >>> On Jan 3, 2017, at 14:52, Gary L. Wade <garyw...@desisoftsystems.com> wrote: >>> >>> Is there a problem with using +[NSDateFormatter >>> localizedStringFromDate:dateStyle:timeStyle:]? Depending on your needs, you >>> might also consider +[NSCalendar autoupdatingCurrentCalendar]. >> >> I am looking for detecting whether or not the system defaults to 12 or 24 hr >> time. The obj-c method I'm already 'parsing', -dateFormatFromTemplate:::, >> returns a template string with well defined formatting tokens that are easy >> to detect. Plus they directly reflect the user's Locale & Region settings. > > I'd expect that would be a function of the language and the locale, possibly > just the locale. Do you care what it defaults to or what it's currently set > to?
That's correct and I only care so far as I can determine it as being either 12 or 24. The relevant methods are, -dateFormatFromTemplate::: returns a format string which -localizedStringFromDate:dateStyle:timeStyle: consumes to produces a human readable Date string. I am not doing the second step described here. Producing he actual string the view is separate from this state stored in my model. The relevant bits are: -dateFormatFromTemplate::: with a template of 'j' returns the default format string for the Locale passed as the Locale argument. I am passing [NSLocale currentLocale]. It is my understanding that any Locale which supports the 12 hr time format must represent the AM/PM as 'a' in the format string provided to -localizedStringFromDate:dateStyle:timeStyle:. So therefore the presence of 'a' indicates that the Locale is configured for 12 hr time. Otherwise, it's 24 hr time. What I am relying on is the behavior of -dateFormatFromTemplate::: when passed the 'j' template. This behavior is documented here http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Date_Format_Patterns. It specifically mentions using 'j' to determine the presence AM/PM or not. i.e. 12 or 24 hr time. Might some Locales only support 12 or 24? Maybe, maybe not. But if I decide to only rely on the setting from Locale & Region and my interpretations are good this should not matter. The user will never see 12 or 24 for locales that do not support them. The specific section is http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Day_Period_Rules. Thanks, Sandor > > - Z > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
