It’s a quarter past 6.

18:15

It’s a quarter past 6.

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

18:15

It’s a quarter past 6.

Error: read quarter as a number

17:45

It’s a quarter to 6.

Error: confuse ‘past’ and ‘to’

17:45

It’s a quarter to 6.

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