A preposition is a word, which shows relationships among other words in the sentence.
Many students of English often get confused as to how to use prepositions of time, such as in, on and at. These prepositions are needed when talking about seasons, months, years, precise time, etc. Here is how and when to use at, in, on as prepositions of time.
Remember that:
AT – for precise time
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times:
at 5 o’clock
at midnight
at 6:30
at noon
holiday periods:
at Easter
at Christmas
at night
at the weekend
at lunchtime
at breakfast time
at dinner time
at the moment
at sunrise
at sunset
Examples:
Let's meet at 5 o'clock.
I usually read a book before I sleep at night.
IN- for months, years, centuries, seasons and long periods
years:
in 1995
in 2014
months:
in June
in April
decades:
in the fifties
in the 1590s
centuries:
in the 18th century
seasons:
in winter
in autumn
in the morning
in the afternoon
in the evening
Examples:
I love the fashion style in the fifties.
I often go to Hokkaido in winter.
ON- for days and dates
days:
on Sunday
on Valentine's Day
on my mother's birthday
dates:
on the 3rd of January
on December 24, 2015
on December 24th
days + morning/afternoon/evening/night:
on Friday morning
on Wednesday afternoon
Examples:
My boyfriend gave me a necklace on my birthday.
I was born on June 4.
No preposition- for tomorrow, yesterday, today, every night, next week, etc.
Examples:
See you tomorrow!
I drink milk every night.