It’s 24 past 8 (Official clock system).

20:24

It’s 24 past 8.

Correct answer

20:23

It’s 23 past 8.

Error: 1 minute earlier

20:04

It’s 4 past 8.

Error: read minutes starting from hour markings and adding minutes

17:40

It’s 20 to 6.

Error: confuse hour and minute hands