The use of in, on and at

in is used with:
years

in 1998

centuries
in the 19th century

parts of the day (exception: at night)
in the morning

decades
in the 1990s

seasons
in summer

months
in October

on is used with:

dates
on January 1, on May 2, 2004

days of the week
on Monday, on Sunday evening

“special days”
on my birthday, on Christmas Day

at is used with:

times
at 7:00, at midnight (12:00)

holidays
at Christmas, at Easter

no preposition is used with expressions with:

ago
one year ago
tonight, this morning, this afternoon, etc.
I'm going to see a movie tonight
tomorrow, tomorrow afternoon, etc.
See you tomorrow
yesterday, yesterday morning, etc.
I didn't go to school yesterday
expressions with last or next
I was in Japan last year

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