Как по будет 10: 15,1: 45,4: 00,6: 15,8: 20 например 8: 30-it is half past eight

It's a quartet past ten in the morning.
It's a quartet to two at night.
It's 4 o'clock at night.
It's a quartet past six in the morning.
It's twenty (minutes) past eight in the morning.

10:15 it is a quarter past 10
1:45 it is a quarter to 2
4:00 4 o'clock
6:15 it is quarter past 6
8:20 it is 20 past 8