Prepositions of Time

ENGLISH GRAMMAR • ALL CLASSES

Learn when to use IN, ON, AT and other prepositions of time with simple rules, everyday examples and a quick practice quiz.

Easy Rules

Examples

Practice Quiz

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📘 What Are Prepositions of Time?

Prepositions of time are words that tell us when something happens. They help us talk about days, dates, months, years, clock times and the duration of an activity.

For example:

I wake up at 6 AM.

My birthday is in July.

We play on Sunday.

Let's learn the rules one by one!

1. 🔵 Preposition of Time: IN

Use IN for longer periods of time.

Remember: IN = Months, Years, Seasons and Long Periods.

Use IN for	Examples
Months	in January, in May
Years	in 2020, in 1995
Seasons	in summer, in winter
Decades and centuries	in the 1990s, in the 18th century
Long periods	in the past, in the future
Time taken to complete something	in an hour, in two days

Examples in sentences

She was born in 2010.
We will visit Goa in December.
Flowers bloom in spring.
I can finish the work in two hours.
I usually study in the morning.

⚠️ Special rule: Say in the morning, in the afternoon and in the evening, but say at night.

2. 🟢 Preposition of Time: ON

Use ON for specific days and dates.

Remember: ON = Days and Dates.

Use ON for	Examples
Days	on Monday, on Sunday
Dates	on 15 August, on 1 January
Special days	on my birthday, on Christmas Day
Day + part of day	on Monday morning, on Friday night

Examples in sentences

The meeting is on Friday.
Independence Day is on 15 August.
We left on Christmas Day.
My exam is on Monday morning.

⚠️ Say at night, not "on night". For a festival name without the word "Day", usage depends on the sentence: "We celebrate Diwali in October" or "We celebrate at Diwali" in some varieties of English.

3. 🟠 Preposition of Time: AT

Use AT for exact times and precise moments.

Remember: AT = Exact Time or Moment.

Use AT for	Examples
Clock times	at 6:30 PM, at 5 o'clock
Night	at night
Exact moments	at sunrise, at the moment
Meal times	at lunch, at dinner
Holiday periods generally	at Christmas, at Easter

Examples in sentences

The train arrives at 5 PM.
We met at lunchtime.
He goes for a walk at sunrise.
I sleep at night.

🇬🇧 Weekend tip: British English commonly uses "at the weekend", while American English commonly uses "on the weekend".

⭐ The Golden Rule: IN vs ON vs AT

Preposition	Think of...	Example
IN	A long period	in July, in 2026
ON	A day or date	on Tuesday, on 20 October
AT	An exact time	at 8 AM, at noon

Easy memory trick: IN = long period, ON = day/date, AT = exact time.

4. 🟣 Other Important Prepositions of Time

A. BEFORE — Earlier than something

Use before when an action happens earlier than another event or time.

Finish your homework before 8 PM.
She arrived before me.

B. AFTER — Later than something

Use after when an action happens later than another event.

We will have dinner after the movie.
He called me after work.

C. DURING — Within a period

Use during for something that happens within a particular period or event.

She slept during the class.
Many birds migrate during winter.

Remember: "during the class" tells us when something happened. "For two hours" tells us how long it lasted.

D. SINCE — Starting point

Use since to show the point in time when an action or situation began. It is often used with the present perfect tense.

She has lived here since 2015.
It has been raining since morning.

E. FOR — Duration

Use for to show how long something lasts.

I have waited for one hour.
They lived abroad for five years.

F. FROM ... TO — Start and end

Use from ... to to show the beginning and ending of a period.

The shop is open from 9 AM to 9 PM.
I will be busy from Monday to Friday.

G. UNTIL / TILL — Up to a time

Use until or till to show that an action or situation continues up to a particular time.

We waited until noon.
The shop stays open till 9 PM.

H. BY — A deadline

Use by to show the latest time by which something must happen.

Submit the form by Monday.
He will reach home by 6 PM.

BY vs UNTIL — Do not confuse them!

Wait until 6 PM. = Continue waiting up to 6 PM.

Come by 6 PM. = Arrive no later than 6 PM.

📝 Common Errors and Corrections

❌ I will meet you on night.

✅ I will meet you at night.

❌ He was born on 1999.

✅ He was born in 1999.

❌ The exam is in Monday.

✅ The exam is on Monday.

❌ I slept during two hours.

✅ I slept for two hours.

📚 Quick Revision Table

Preposition	Meaning / Use	Example
In	Months, years, seasons	in July
On	Days and dates	on Monday
At	Exact time	at 7 PM
Before	Earlier than	before lunch
After	Later than	after school
During	Within a period	during winter
Since	Starting point	since 2020
For	Duration	for two hours
From ... to	Beginning and end	from 2 to 4 PM
Until / Till	Up to a time	until evening
By	Deadline	by Friday

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