You can use the sun and the moon…..I’ll see you tomorrow morning/afternoon/evening/night
Four kinds of clocks
Or you can use a clock. It’s night time, it’s 10 o’clock, it’s 10 PM, it’s 22 hundred hours.
Cock = /kɒk/, as in cough /kɒf/, or cot, as in /kɒt/
Clock = /klɒk/, as in block /bkɒk/, or flock /flɒk/