Prepositions of Time

at

1. at four o’clock
   at 7 o'clock
   at 10.30am ;
   
2. at midnight
   at noon
   at sunrise
   at sunset
   at nigh – ночью, (также и in the night);
   
3. at lunch
   at dinner (time)
   at tea-time;
   
4. at Christmas
   at Easter
   at the end of the month
   at the end of the January
   at the end of the film
   at the end of the concert;
   
5. at present;
   at the moment;
   at the same time;
   at this/that time;
   at the age of 20;
   at the beginning (of);
   at the end;
   at first.

in

1. in the morning
   in the afternoon
   in the evening
   а in the night /at night;
   in the evenings;
   
2. in January
   in February
   in April
   in May;
   
3. in (the) winter
   in (the) spring
   in (the) summer
   in (the) autumn
   (с the о конкретном отрезке времени – встреч. чаще, без the в общем/абстрактном смысле);
4. in 2005
   in the 1990s
   in the 80s
   in the 20th century
   in the next century
   in the Easter holiday(s)
   in the Christmas holiday(s)
   in the past
   in the future;
   
5. in a few minutes
   in an hour
   in two hours
   in two days
   in a month
   in a year.

on

1. on Sanday
   on Monday
   on Tuesdays
   on Wednesday morning
   on Thursday afternoon
   on Friday evening
   on Saturday night;
   
2. on the 1st of September
   on the 15th of May
   on 6 March
   on 25 Dec. 2004
   on July 30th
   on December 25
   
3. on Christmas Day
   on Independence Day
   on the/(my) birthday
   on my day off
   on weekend
   on weekends
   on that day
   on arrival

Время суток:
at 3 o'clock - в 3 часа
by 3 o'clock - к 3 часам
for 3 hours - за 3 часа (в течение 3-х часов)
since 3 o'clock - с 3 часов
till 3 o'clock - до 3 часов
in 3 hours - через 3 часa
from 3 to 4 o'clock - с 3 до 4 часов

Предлоги времени не употребляются:
а) в выражениях со словами next следующий и last прошлый:

He's coming back next Tuesday. (not on next Tuesday) Он вернется в следующий вторник.
I went to London last June. (not in last June) Я ездил в Лондон в прошлом июне.

б) в выражениях с this этот (и иногда с that тот/этот):
We'll call you this evening. (not in this evening) Мы позвоним тебе сегодня вечером.

в) перед tomorrow завтра, yesterday вчера, the day after tomorrow послезавтра, the day before yesterday позавчера:
I've got to get up very early tomorrow morning.
Я должен/Мне нужно встать очень рано завтра утром.

г) перед one однажды/один, any любой, each каждый, every каждый, some какой-нибудь, all весь:
You can come any day. Ты можешь прийти в любой день.
We meet every Sunday. Мы встречаемся каждое воскресенье.