No, we just have to do a little kindergarten (age 5) math, the difference between 12 and 15 is 3.

The 3rd-grade math (age 8) of figuring what time it will be 9 hours and 47 minutes later is equally difficult whether using 24h or am/pm. And may be easier using angles on an analog clockface, especially for an old fart like me.

The real problem with time isn’t 12h vs 24h. It’s the increments 12/24/60/30/15/5 when the rest of our system is base 10.

Oh and Daylight Savings. Jet lag without getting to go anywhere. Fuck that shit.