Preposition of Time is a preposition that indicates some relationship of a noun or pronoun with respect to time.

Prepositions of this group include in, at, on, for, till, until, during, after, by, before, since, etc.

Examples:

1. It gets very cold during December and January.
2. You can stay here till the end of the month.
3. The man has been coughing for some minutes.