Сравните: on, in, at

We arrive at six o'clock.
We arrive on Saturday.
We are arriving in November. 
We will arrive in 2015.

At + time употребляется

ФразаПеревод
at 16 o'clock в 16 часов
at 12,15 в 12,15
at sunset на закате
at suppertime во время ужина
at midnight в полночь 

On + даты and дни

ФразаПеревод
On Saturday/Saturdays в субботу/ по субботам
on 15 May 2013 в мае 15-го 2013
on my sister's birthday в день рождения моей сестры
on Christmas Day в Рождественский День

In  + месяцы, сезоны и годы

ФразаПеревод
in November в ноябре
in (the) summer летом
in 2015 в 2015-м
in thirteenth century в 13 веке
in the Middle ages в средние века
in (the) future в будущем
in the past в прошлом

Употребление at в выражениях

ФразаПеревод
at the same time в тоже самое время
in (the) summer летом
in 2015 в 2015-м
at Easter/at Christmas
(но: On Christmas Day)
на Пасху/в Рождество
(но: в Рождественский День)
At present в настоящее время
at the moment в данный момент
at night ночью
at the weekend(s)  на выходные
in the night ночью
late into the night поздно ночью

He dislikes watching tv at night.
Where were our guests at the weekends
Did the parents of mine use to leave the presents from Santa Claus under the Christmas tree at Christmas/on Christmas Day?
Mrs Brignall and Mrs Brignall are reading at present/at the moment.
Helen and Mike phoned at the same time.

Можно спросить "What time..." (not typical "At what time?")

What time is Mike taking the test tomorrow? - В котором часу Майк сдает экзамен завтра?

Можно сказать:

ФразаПеревод
in the evening вечером
in the afternoon днем
in the morning утром 

They are seeing her off this afternoon. - Ее провожают сегодня днем.
Does she usually go for a drive in the morning?  - Она обычно ходит кататься на машинеутром?

Но:

ФразаПеревод
On Tuesday evening(s) во вторник вечером
Wednesday morning(s) в четверг днем
on Thursday afternoon(s), во вторник утром 

She is going to get to granny on Saturday evening. 
Does she often ask out on Tuesday evening?

Предлоги не употребляются перед next/this/last/every

My parents will meet us next Tuesday.
My parents went to Australia last May.

In seven Months, in a minute (in = через)

The plain will be in due to land in tow hours.
Daizy went out. She was due to flew back in 3 months.
They say in a year's time, in amonth's time
She is giving a birth in five week's time (через 5 недель)

In - за

Сколько времени мы потратим на выполнение какого-либо дело.

I drew this picture in 9 hours.

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