- in 2014, in April, in the summer, in the 19th century
- in the afternoon
- in six weeks' time
For periods of time
For parts of the day
To say the period of time before something happens or how long something takes
AT
Annotations:
- at the three o' clock, at the end of the lesson, at midnight.
- at breakfast
-at the weekend, at Christmas, at Easter
- at night
Examples:
I prefer to study at night.
We go to the cinema at the weekend.
NOTE: on the weekend is common in American English.
Points of time
Mealtimes
Night when talking about nights in general
The weekend, Christmas and Easter
ON
Annotations:
- on July 13th
-on Sunday night
- on a sunny day
For particular dates, days, parts of day or types of days