14:50 - ten minutes to three;

15:50 - ten minutes to four;

17:25 - twenty five past five;

19:40 - twenty minutes to eight;

20:55 - five minutes to nine;

22:15 - quarter past ten;

22:50 - ten minutes to eleven;

23:55 - five to twelve;

12:55 - five minutes to thirteen (если 24 часовой) or five minutes to one (если 12 часовой, можно написать pm)