It is a quarter to three a.m.
It is half past noon.
It's exactly one o'clock a.m.
It is a five minutes to twelve a.m.
It is a ten minutes past six a.m.
It is a seventeen minutes past five a.m.
It is a eight minutes to eleven a.m.
It is a eighteen minutes to four a.m.
It is a twenty minutes past four a.m.
It is a quarter to nine a.m.