Some new strings have been added that reference 12 hour and 24 hour time as "Hour Modes" and I think a much better term for the English string would be or . This is a much more universally understood term for choosing how clocks display the time.

Examples of strings using this term (not extensive):

#76020 "Hour " (Format)

#76044 "Change the clock to 24 hour " (format)

#76018 "Change the clock hour [...]" (format)