Prepositions of time help us describe the time of an event or ‘when’ something happened.
In is used for non-specific times during the day, month, season or year.
- It gets very hot in summers.
On is used for specific days and dates. It is also used for special days.
- We can meet on Sunday.
At is used for specific times.
- I left for the party at 6:30 P.M.