На британский язык словами 6:00; 12:10; 13:15; 16:20; 17:45; 03:30; 18:50;

6:00 - six am
12:10 - ten minutes past twelve (minutes можно опустить)
13:15 - a quarter past one pm
16:20 - twenty minutes past four pm (minutes можно опустить)
17:45 - a quarter to six pm
03:30 - half past three am
18:50 - ten minutes to seven pm (minutes можно опустить)
14:05 - five minutes past two pm (minutes можно опустить)
07:55 - five minutes to eight am (minutes можно опустить)
20:30 - half past eight pm

ps.
Время с 00 до 12 обозначают a.m, а время с 12 до 00 часов p.m.
Заместо слова "пятнадцать" надобно использовать quarter (четверть)
До половины часа надобно использовать "past", а после половины "to"
Слово minutes (минутки) в британском языке обычно спускается.

Если это вопрос,тогда It is six oclock, it is ten minutes part twelve,it is fifteen minutes past one,it is twenty minutes past four,it is fifteen minutes to six,i is half past three,it is ten minutes to seven,it is five minutes past two,it is five minutes to eight,it is half past eight.

six oclock in the morning, twelve oclock and ten minutes, fifteen minutes after two, twenty minutes past four, a quarter to five five, half past four, five past eight minutes, half past eight.