In Poland in 90s people still used 12h clock slightly more often than 24h (but both were used interchangeably). Nowadays only really old people use 12h by default. Everything's in 24h. It's just much better.

People might still say "meet at 7" instead of 19 for a shortcut it it's obvious from the context, but they will write it as 19:00 and think of it as 19:00.

BTW we never did "am" vs "pm", we had "1..11 morning" -> "12 noon" -> "1..11 afternoon" -> "12 midnight". And for afternoon hours the "afternoon" was usually skipped. So no 12 am/pm confusion. I could never get used to the American am/pm.