On a day vs in a day

Both "on a day" and "in a day" are correct, but they are used in different contexts. "On a day" is used to refer to a specific day or date, while "in a day" is used to indicate a period of time within a single day.

Last updated: March 27, 2024 • 2686 views

This phrase is correct and commonly used in English to refer to a specific day or date.

"On a day"

Use "on a day" when you want to specify a particular day or date. For example, "I will see you on Monday."

Examples:

She was born on a sunny day in June.
The event is scheduled to take place on a rainy day next week.
We always go for a picnic on a warm day in spring.
I have an important meeting on the first day of the month.
They will arrive on the same day as us.

Show examples from the web [+]

On a day like today, I doubt that's possible.
On a day like this... we can smell the sky itself.
On a day like today, 5 years ago.
On a day with no wind, rain that falls quietly, softly.
On a day like today, it just feels like people should be together.
On a day like today, you should've driven here.
On a day like this, many years ago, it was my birthday.
On a day like this, we can feel the truth of those words.
On a day such as today, we must remind one another that Economic and Monetary Union is intended to be a citizens' project.
On a day like today, he should let his son bathe first.
On a day like this, one has to live up to expectations.
On a day in late August or early September 1941,
On a day like this, if all you've got's a niggle, you're laughing, mate.
'On a day like today, you can just let all your worries slip away!
On a day when I really, really needed you.
On a day like this, it's important to give a thought to those who fight for Norway on a daily basis.
On a day that is not the Fourth of July?
A man had his hands on my hips On a day that was set aside for the lord!
Unbelievable, on a day like today.
- My brother died on a day like this.

Alternatives:

on Monday
on June 1st
on a specific day
on a particular date
on a certain day

This phrase is correct and commonly used in English to indicate a period of time within a single day.

"in a day"

Use "in a day" when referring to a duration or period of time that occurs within a single day. For example, "I can finish this project in a day."

Examples:

He can run a marathon in a day.
I will complete this book in a day.
She painted the entire house in a day.
They traveled to three different cities in a day.
I can learn a new language in a day.

Show examples from the web [+]

Russia wasn't conquered in a day...
The forest wasn't grown in a day.
I'll let you know in a day.
Probably in a day or two.
We will process around 2,000 meters of cloth in a day.
Hard enough to take one of you in a day.
I have to write my first song in a day.
And your coke demand dies in a day.
Speltzer couldn't have done all of this in a day.
I can get to London and back in a day.
He'd crush us in a day.
- We could replace our losses in a day.
Could do a lot in a day.
Even in a day and a half.
Nothing we couldn't hit in a day.
The wedding was planned in a day. It's tradition.
The matron just said it consumed her in a day.
But Rome wasn't destroyed in a day.
He can reassemble an engine in a day.
The average number of bugs Barry swallows in a day of running.

Alternatives:

within a day
during a day
in one day
within 24 hours
in a single day

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On a day vs in a day

"On a day"

"in a day"

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