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I've lived my whole life in the UK where the 12-hour clock is commonplace and I also still can't remember this either...

Gaaaaaah! I scheduled an exam for an online certification at 12 AM, I think. And then I found out that's midnight :-(

Just make it 06:00, 13:00, already :-(

Yeah you're not wrong, but AM is ante meridiem and PM is post meridiem where meridiem is mid day. I'm not sure if that really helps?

It's more that if you reset to 0 at mid-day and midnight, then logically 12:30am should be 00:30am for example.

trouble is you easily remember it as "after" and "pre" midday.

In middle school I often had to reset my plugged-in 12-hour alarm clock at night because I would switch plugs for some reason.

I noticed a pattern that sometimes my alarm would refuse to ring in the morning but would ring at 8 at night.

I eventually noticed that it only happened when I stayed up late and reset the time/alarm at midnight and figured out that my clock was broken because it thought that 11 PM is followed by 12 AM.

It was more than a decade until I found out that it was correct.

I use am = after midnight, pm = pefore midnight to remember it