It’s 18 past 6 (Alternative clock system).

18:18

It’s 18 past 6.

Correct answer

18:17

It’s 17 past 6.

Error: 1 minute earlier

18:06

It’s 6 past 6.

Error: read minutes starting from hour markings and adding minutes

16:30

It’s half past 4.

Error: confuse hour and minute hands