Как будет по английски 8:30 , 10:10, 23:35 ,17:17 ,02:03 ,21:00 ,07:27 ,15:20 ,22:45 ,01:16 ,19:50,05:30, 09:57, 00:00.

Вот как это естественно сказать на английском (даю два варианта: «цифрами» и разговорный past/to):

• 8:30 → eight thirty (8:30 a.m.); half past eight

• 10:10 → ten ten (10:10 a.m.); ten past ten

• 23:35 → eleven thirty-five p.m.; twenty-five to twelve

• 17:17 → five seventeen p.m.; seventeen past five

• 02:03 → two oh three a.m.; three past two

• 21:00 → nine o’clock p.m. / nine p.m.; (вариант past/to здесь не нужен)

• 07:27 → seven twenty-seven a.m.; twenty-seven past seven

• 15:20 → three twenty p.m.; twenty past three

• 22:45 → ten forty-five p.m.; (a) quarter to eleven

• 01:16 → one sixteen a.m.; sixteen past one

• 19:50 → seven fifty p.m.; ten to eight

• 05:30 → five thirty a.m.; half past five

• 09:57 → nine fifty-seven a.m.; three (minutes) to ten

• 00:00 → midnight (обычно так, реже twelve a.m.)