We use the ISO-8601 date and time format, mostly. We separate the portions by points, not dashes, though. So a typical date looks like this: 2023.12.22.
If we shorten it without the year, it's 12.22., or 5.12.
We say it with just the numbers, without the points, and shorten "hónap" (month) to "hó". So its "5. hó 12", basically "5th mo' 12".
For time we use the 24H format, regularly even in everyday speech. If it's very clear that you are in the late afternoon or evening, you just say "6 o'clock 24" or "13 o'clock 46".
So always from bigger to smaller "powers". It's auto-sorted on most filesystems, table of contents etc. and very clear in everyday use. It's nice.
I generally prefer dates ordered from most to least prominence myself, but any ordering is better than the weird flip flopped month day then year thing we got Stateside.
Interesting that y'all say o'clock before the minutes, tho! Haven't seen that before.
When it's obvious that you are talking about the evening, like it's winter, dark, and you are walking on the street and somebody asks what time it is, you just say 6 o'clock/hour 24.