How do you write three o' clock in two ways?

Answer 1

Expressed according to the 12-hour clock, this would be written 3:00 AM or 3:00 PM.

Expressed according to the 24-hour clock, this would be written 03:00 or 15:00.

Answer 2

Three o'clock can be written in two ways as "3:00" in digital format and "three o'clock" in verbal format. The digital format uses numbers to represent the time, while the verbal format spells out the time using words. Both formats convey the same time of day, but in different representations.