It’s 23 to 7 (Official clock system).

06:37

It’s 23 to 7.

Correct answer

06:38

It’s 22 to 7.

Error: 1 minute later

05:51

It’s 9 to 6.

Error: read minutes starting from hour markings and adding minutes

07:30

It’s half past 7.

Error: confuse hour and minute hands