It’s 28 past 8 (Alternative clock system).

20:28

It’s 28 past 8.

Correct answer

20:27

It’s 27 past 8.

Error: 1 minute earlier

20:08

It’s 8 past 8.

Error: read minutes starting from hour markings and adding minutes

18:40

It’s 20 to 7.

Error: confuse hour and minute hands