It’s 13 past 9 (Official clock system).

21:13

It’s 13 past 9.

Correct answer

21:14

It’s 14 past 9.

Error: 1 minute later

21:05

It’s 5 past 9.

Error: read minutes starting from hour markings and adding minutes

15:45

It’s a quarter to 4.

Error: confuse hour and minute hands