1:00
1 a m, one in the morning
2:00
2 a m
3:00
3 a m
4:00
4 a m
5:00
5 a m
6:00
6 a m
7:00
7 a m
8:00
8 a m
9:00
9 a m
10:00
10 a m
11:00
11 a m
12:00
noon, 12 p m
13:00
1 p m
14:00
2 p m
15:00
3 p m
16:00
4 p m
17:00
5 p m
18:00
6 p m
19:00
7 p m
20:00
8 p m
21:00
9 p m
22:00
10 p m
23:00
11 p m, 23 hundred hours
0:00
midnight, 12 a m