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 
in
spring.
Incorrect: Salvation came to us 
on 
the twentieth century.
Correct: 
Salvation came to us 
in
the twentieth century.
Use 
at
with 
night
, 
noon
, or a 
festive occasion
.
Incorrect: We have our moments 
in
the night.
Correct: 
We have our moments 
at
night.
Incorrect: I go hiking 
in
Christmastime.
Correct: 
I go hiking