Time in English

There are 2 ways to speak the time as detail below:
1. Speak hour and then minutes
ex.
6 : 10 ---> Six ten
5 : 30 ---> Five thirty
7 : 40 ---> Seven forty
for minutes 0 - 09. we can add 'oh'. ex. 1:05 ---> One (oh) five

2. Speak minutes and then hour
for minutes 01-30 we use past
ex.
6 : 10 ---> Ten past six
5 : 30 ---> Thirty past five

But, for minutes 31-59 we use to
ex.
8 : 40 ---> Twenty to nine
9 : 55 ---> Five to ten

Remark:
15 minutes = a quarter
30 minutes = a half
ex.
3 : 15 ---> a quarter past three
5 : 30 ---> half past five
1 : 45 ---> a quarter to two