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English Grammar Reference: Prepositions of time

The preposition we use when we talk about a period of time depends on how long the period of time is.

Specific day

on

1st October
Christmas Day
my birthday

Short period (longer than 1 day less than 1 month)

at

the weekend
Christmas ( the Christmas period not just Christmas day)

Long period (at least a month)

in

June
summer
1990
the 1960s
the 16th century

Time

at

7 o'clock
midnight

 

Take a look at these related pages

English Grammar Reference: Dates

English Exercises: Prepositions of time