German class taught me fünf nach sechs.
Or if you want a real nighrmare
6:35
fünf nach halb vor 7
5 past half an hour to 7... It's in my textbook people look at me funny if I use it.
British English I still haven't figured out if half 7 is 6:30 or 7:30. Halb 7 in German is 6:30
Living in Germany coming from north America doing a lot of work with England I miss a lot of meetings that are at 17:30... Either I screw up the 12 hr change and can't remember if the said 7 or 17 and then where the half hour falls before or after.