Toggle buttons which add.
0..9 = +5 +2 +1 +1
For a digital clock:
0..5 = +3 +1 +1
0..2 = +1 +1
But these still possible to get nonsensical 29:00, so
0..23 = +12 +6 +3 +1 +1
For a touchscreen.
Alternatively, grids of 24 buttons for hour, 12 (multiples of 5) for minutes and +3 +1 +1.
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