TimePicker localisation

[rklos]

Use case

I want to create an app in my native language. In my language we use the 24-hour format (without the AM/PM suffix),
It would be nice to change the time format in TimePicker.

Proposal

I have no idea how to do it in case of the graphical picker (the clock), but the textual picker can look like this:

API can be done like the date formatting in DatePicker (#415)

[GroovinChip]

I have no idea how to do it in case of the graphical picker (the clock), but the textual picker can look like this:

I don't think this would apply to the graphical picker, only the textual.