Как по написать время 6.15 ,7.00,8.45,10.30,11.00,5.45?

Quarter past six, seven o'clock, quarter to nine, half past ten, eleven o'clock, quarter to six.

6,15 It’s a quarter past six am
7.00 Seven o'clock (второй вариант как)
8,45 It's a quarter to nine am
10.30 It's ten thirty 
11.00 Even o'clock
5.45 Five forty four