I didn't even know what that number says

One time I was on shrooms in the PMs and it was really hard to figure out what the time was. The literal digits and the concept of time itself at some point.

Otherwise, never had an issue.

Also, is 24hour time not default on most phones? Or did I do that and forget about it at some point, and it's only me, never paying attention to the time on other people's phones

Yeah lol, that's way more mental gymnastics than just adding/subtracting 12. I dont even bother with the whole 12, I just add and subtract 2 and my mind kind of deals with the extra 10 hours I'm too lazy to deal with.