6:10 ten past six / six ten / six ten o'clock
6:30 half past six / six thirty / half to seven
6:45 six forty-five / a quarter to seven / forty-five past six
7:00 seven / seven o'clock / seven a.m.
6:10 ten past six / six ten / six ten o'clock
6:30 half past six / six thirty / half to seven
6:45 six forty-five / a quarter to seven / forty-five past six
7:00 seven / seven o'clock / seven a.m.