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
30 minutes past the hour.
9:30
4:30
3:30
1:30
6:30 i suppose
3:30
half past 6
4.35
The time of half an hour past one o'clock same as half an hour before 2 o'clock 01:30 or 13:30 1:30 am or 1:30 pm