Prepositions of Time:How to Use In, On, At, Since/For, By/Until, Before/After

Do you get confused about using "in," "on," and "at" when talking about time? You're not alone!

Prepositions of time can be tricky, but once you learn the rules, they become much easier.

In this guide, you’ll learn how to use prepositions of time correctly, avoid common mistakes, and test your knowledge with a quick quiz!

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📌 What Are Prepositions of Time?

Prepositions of time help us describe when something happens.

The most common ones are:

✅ IN – for longer periods (months, years, centuries)

✅ ON – for specific days and dates

✅ AT – for exact times and specific expressions

Let’s break them down with easy examples!

🕒 1. When to Use "IN" – Longer Periods of Time

Use "in" for:

✔ Months → in January, in July

✔ Years → in 2025, in 1998

✔ Centuries → in the 21st century, in the 1800s

✔ Decades → in the 90s, in the 2000s

✔ Seasons → in summer, in winter

✔ Parts of the day → in the morning, in the afternoon (BUT: at night!)

💡 Examples:

✔ I was born in June.

✔ They moved to London in 2015.

✔ We love going to the beach in summer.

📅 2. When to Use "ON" – Specific Days & Dates

Use "on" for:

✔ Days of the week → on Monday, on Friday

✔ Dates → on April 10th, on December 25th

✔ Holidays (with "Day") → on Christmas Day, on New Year's Day

✔ Specific days → on my birthday, on the weekend (US English)

💡 Examples:

✔ She has a meeting on Wednesday.

✔ We celebrate Christmas on December 25th.

✔ He was born on Valentine's Day.

⏰ 3. When to Use "AT" – Specific Times & Expressions

Use "at" for:

✔ Clock times → at 3 PM, at 7:30 AM

✔ Festivals & Holidays (without "Day") → at Christmas, at Easter

✔ Specific times of the day → at noon, at midnight, at sunrise

✔ Weekend (British English) → at the weekend

💡 Examples:

✔ The train arrives at 5:45 PM.

✔ We open presents at Christmas.

✔ I always wake up at sunrise.

📖 4. Other Important Prepositions of Time

🔹 "Since" → From a specific point in the past until now

- I have lived here since 2010.

🔹 "For" → Duration of time

-We stayed for three hours.

🔹 "By" → No later than a specific time

-Finish the report by Friday.

🔹 "Until/Till" → Up to a certain point in time

- The shop is open until 9 PM.

🔹 "Before/After" → Show time order

-We will meet before the show.

🔹 "From...to/until" → Start and end time

- The class runs from 8 AM to 10 AM.

🚫 5. Common Mistakes to Avoid

❌ Incorrect: I was born at July.

✅ Correct: I was born in July.

❌ Incorrect: We have a meeting in Monday.

✅ Correct: We have a meeting on Monday.

❌ Incorrect: The train arrives in 8 PM.

✅ Correct: The train arrives at 8 PM.

📝 6. Quick Practice Quiz – Test Yourself!

Fill in the blanks with in, on, at, since, for, until, before, or after:

1) I usually wake up ___ 7 AM.

2) They got married ___ 2018.

3) We will go on holiday ___ June 15th.

4) He has been working here ___ five years.

5) The movie starts ___ midnight.

6) I stayed in Paris ___ three weeks.

7) Let’s meet ___ the weekend.

(Scroll down for the answers!)

📊 7. Prepositions of Time – Quick Reference Chart

Preposition	Used For	Examples
In	Months, Years, Decades, Seasons, Parts of the Day	in June, in 2020, in summer
On	Days, Dates, Holidays with "Day"	on Monday, on my birthday, on Christmas Day
At	Specific Times, Festivals, Night, Weekend (UK)	at 5 PM, at night, at Easter
Since	Point in past until now	since 2005, since last week
For	Duration of time	for two hours, for a long time
By	No later than a time	by Friday, by 10 PM
Until/Till	Up to a certain time	until next week, till 6 PM
Before/After	Show order of events	before dinner, after work

🎯 8. Final Thoughts – Keep Practising!

Mastering prepositions of time takes practice, but this guide gives you everything you need to speak and write English more confidently!

✨ Want more English grammar tips?

Check out our latest lessons on prepositions and common mistakes in English!

📢 Share this post with other learners and let us know in the comments: Which preposition do you find the hardest?

📌 Answers to the Quiz:

1) at 7 AM

2) in 2018

3) on June 15th

4) for five years

5) at midnight

6) for three weeks

7) at the weekend (UK) / on the weekend (US)

Thank you for reading & Happy Learning!

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