Prepositions of Time

The prepositions at, on, and in

We use at for specific times.

For example:-
I start work at 7.00 a.m.
I don't work at night.

We use on for specific days and dates .

For example:
My birthday is on Monday.
We're having a party on 7th September.

We also use on for some special days.

For example:
On Christmas day.

We use in for nonspecific times during a day, a month, a season, or a year.

For example:
In summer it's too hot to work.
I started this web site in 1999.
She woke up in the night.

More prepositions of time
Point in Time

at 6 o'clock
on Saturday
April 10th
Christmas Day
by the end of July

(indicates a deadline=at the latest)
till / until / up to March

(indicates an end point)
since April
10th March

(indicates a beginning point in time)

Length of Time

in July
the autumn
the morning
the middle of …….
at night
the weekend
during the meeting
the lesson
for two days
twelve months
throughout August
the project

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