It’s 20 past 1 (Official clock system).

01:20

It’s 20 past 1.

Correct answer

00:40

It’s 20 to 1.

Error: mirror minute hand about the vertical axis

01:04

It’s 4 past 1.

Error: read minutes as hours with ‘past’ or ‘to’

04:01

It’s 1 past 4.

Error: confuse hour and minute hands and read as hours with ‘past’ or ‘to’