12:00 - noon
00:00 and 24:00 - midnight
Twelve fifteen / Quarter past twelve
Twelve thirty / Half past twelve
Twelve forty-five / Quarter to one
One fifty / Ten to two
It's twenty-eight minutes to two. / It's just turned half past one.
It's two minutes to two. / It's nearly two o'clock.
It's one minute past four. / It's around four o'clock.