It’s 21 past 11 (Official clock system).

23:21

It’s 21 past 11.

Correct answer

23:22

It’s 22 past 11.

Error: 1 minute later

23:05

It’s 5 past 11.

Error: read minutes starting from hour markings and adding minutes

16:55

It’s 5 to 5.

Error: confuse hour and minute hands