determine if “24-hour clock” setting is set

问题:

What's the best way to determine if the user has set the "24-hour clock" setting to true in Settings-Date+Time on the Windows Phone ?

Can I get this information through the CurrentCulture (CultureInfo) ? I had no luck in finding it.

回答1:

The system clock type can be retrieved using:

string clockType = Windows.System.UserProfile.GlobalizationPreferences.Clocks.FirstOrDefault();

This will return the string 24HourClock if the 24 hour setting is on in the device settings or 12HourClock if the setting is off.

回答2:

The DateTimeFormatInfo.CurrentInfo.ShortTimePattern way of getting the hour is tied to the culture, and not to the option showing whether 24-hour time is enabled or not. So you will get h:mm tt for English (United States) and HH:mm for German (Germany).

At this moment, you cannot get this system setting.

回答3:

On the back of Dennis' answer, you should be able to determine 24-hour time using String.Contains:

bool is24HourTime = DateTimeFormatInfo.CurrentInfo.ShortTimePattern.Contains("H");

回答4:

For japanese developers, please note.

DateTimeFormatInfo.CurrentInfo.ShortTimePattern in the culture ja-JP will return the same string H:mm, regardless of if the phone setting for 24-Hour time is enabled or not.