It refers to the time of day. 01:30 or 13:30
30 minutes after the hour. "Its half past 1." it's 1:30!
Half past 1:30 is 2 o'clock
Half past 1 is 1:30. It indicates that 30 minutes have passed since 1:00.
30 minutes past the hour.
3:30
4:30
9:30
1:30
6:30 i suppose
half past 6
3:30
4.35