When I was studying for my CELPIP exam I got material from them. Unfortunately, I can not put the PDF to the public because it has a watermark with my personal email. But I can put you here what it says.
CELPIP's twentieth-first error as they state:
Prepositions show the relationship of a noun or pronoun to some other word in the sentence. They are almost always used in combinations with other words to create prepositional phrases. These phrases are most often used to show location, movement, and duration. However, prepositions can be combined with various words to create literally thousands of different meanings.
How to Use Prepositions of Time (IN, AT, and ON)
|in||parts of the day||in the morning|
|seasons||in the autumn|
|points in the future||in a second; in a few weeks|
|at||clock time||at 4 o'clock|
|time of day||at noon; at lunchtime|
|entire holiday||at Christmas|
|on||days of the week||on Sunday|
|dates||on March 3rd|
|one holiday day||on Christmas day|
|parts of the day or week||on Friday afternoon; on the weekend|
At, on, and in are not usually used before next, last, this, and that:
- Are you available in this morning?
- What did you do on last Eastern?