It’s a quarter past 11.

23:15

It’s a quarter past 11.

Error: read digital clock as if it were an analogue clock

23:15

It’s a quarter past 11.

Error: read quarter as a number

22:45

It’s a quarter to 11.

Error: confuse ‘past’ and ‘to’

22:45

It’s a quarter to 11.

Error: confuse ‘past’ and ‘to’ and read quarter as number