You found a hidden setting! But it does not work, the 24 hours option shows also the seconds, that is not desired.
To get to these options you have to open the options, projector settings, about and then scroll 1 down to software version. If you press 5 times ok a settings menu appears, where you can set various options, like app permissions.
5 clicks on launcher version gives also a hidden menu, like a factory test. My chinese is very bad, so I cannot do much with that.