IN / ON / AT
IN
in is used with:
years                                                    in 1998
centuries                                              in the 19th century
parts of the day (exc.: at night) in the morning
decades                                               in the 1990s
seasons                                               in summer
months                                                in October
ON
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
at is used with:
times                                                    at 7:00, at midnight (12:00)
holidays                                               at Christmas, at Easter
NO PREPOSITION
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 
 
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