200 English Grammar Mistakes!: A workbook of Common Grammar and Punctuation Errors with Examples, Exercises and Solutions So You Never Make Them Again

Preposition of Time
Prepositions in this category help to state when something had happened, has
happened, or will happen. Examples of preposition of time are: 
at
, 
on
, 
in
,
before
 and
 after
.
Abide by the following rules when using the preposition of time.
Use preposition 
on
 for days and dates of the month.
Incorrect:  School resumes 
in
 Monday.

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Correct: 
School resumes 
on
 Monday.
Incorrect:  Christmas is 
in
 December 25th
.
Correct:  
Christmas is 
on
 December 25th
.
Incorrect:  I got my birthday present 
in 
my birthday.
Correct: 
I got my birthday present 
on
 my birthday.
Use the preposition "in" when stating years, months, seasons, centuries and
times of day.
Incorrect:  My wife and I got married 
on
 2002.
Correct: 
My wife and I got married 
in 
2002.
Incorrect:  Every year, my family vacation falls 
on
 spring.
Correct: 
Every year, my family vacation falls