16:50 it is ten minutes to five.
16:55 it is five minutes to five.
19:40 it is twenty minutes to eight.
22:35 it is twenty five minutes to eleven.
7:15 it is a quarter past seven.
8:25 it is twenty five minutes past eight.
18:30 it is half past six.
21:20 it is twenty minutes past nine.
23:00 it is eleven p.m.