It’s 22 to 7 (Alternative clock system).

06:38

It’s 22 to 7.

Correct answer

06:39

It’s 21 to 7.

Error: 1 minute later

05:50

It’s 10 to 6.

Error: read minutes starting from hour markings and adding minutes

08:30

It’s half past 8.

Error: confuse hour and minute hands