How do I find out whether a locale uses 12 or 24 hour time in Java?
In Java, I want to print just the time of day in hours and minutes and want it to correctly switch between, e.g., "13:00" and "1:00 PM" according to the locale. How do I do 开发者_JS百科this?
The locale doesn't explicitly specify whether 12 or 24 hour time formats are preferred. Rather, locale specific date formats are handled by the locale defining the formats directly.
If you simply want to use the "locale preferred" time format, just call one of the three
DateFormat.getTimeInstance(...)
static methods, and use whateverDateFormat
it returns.If you have a
SimpleDateFormat
instance in your hands, you could (if you were prepared to do a significant amount of coding) calltoPattern()
and parse the resulting pattern to see if it used a 12 or 24 hour dates ... or neither. You could even tweak the pattern to use the "other" form and then callapplyPattern(String)
to alter the format.
Use the java.text.DateFormat class to create the correct output of the given time.
As from the API:
To format a date for the current Locale, use one of the static factory methods:
myString = DateFormat.getDateInstance().format(myDate);
You just use the getTimeInstance()
method and call the format()
method on the returned DateFormat object
I have written small function which detects whether current locale uses 24 or 12 hours:
public static boolean is24HourLocale() {
String output = SimpleDateFormat.getTimeInstance(DateFormat.SHORT).format(new Date());
if (output.contains(" AM") || output.contains(" PM")) {
return false;
} else {
return true;
}
}
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