Prepositions for time

in
Use "In" for parts of the day, months, seasons and years

 

+ Months: January, February
+ Year: 1998
+ Parts of the day: The morning, afternoon and the evening
+ Season: the summer

in
Use "On" for specific days and dates.

 

+ Day: Monday
+ Date: on July 1st

 

in

Use "At" for times of the day and festivals.

 

+ Time: four o'clock
+ At specific moment/calendar: Christmas/Easter/New Year
+ Night
+ The weekend

 

calendar