one day vs in one day

Both "one day" and "in one day" are correct, but they are used in different contexts. "One day" is used to refer to a single day in the future or past, while "in one day" is used to indicate that something will happen within a period of 24 hours.

Last updated: March 29, 2024 • 884 views

one day

This phrase is correct and commonly used in English to refer to a single day in the future or past.

Use "one day" when talking about a specific day in the future or past. For example, "One day, I will travel around the world."

Examples:

One day, I will be able to speak fluent English.
I hope to visit Paris one day.
One day, she woke up feeling different.
He promised to return one day.
One day, everything will make sense.

Show examples from the web [+]

Until one day he got stabbed.
Perhaps even as match for gannicus one day.
Forget your friend for one day.
Survive and one day return home.
Miss Castillo could be me one day.
A woman two-timed me one day...
Me and Eddie started playing cards one day.
Then one day that hand gets clammy.
A one day non-refundable reservation fee.
Increase dosage one day for each year.
Because seminarians will be priests one day.
The detective was here one day.
Each attack was premeditated, one day apart.
You were leaving for one day.
Until one day Bork meet an interesting discovery.
Lessons lasting more than one day include video analysis.
All the itineraries last one day.
Perhaps one day the responsibilities will be ascertained.
During our project we used images taken one day apart.
Suddenly one day it started raining heavily.

Alternatives:

someday
eventually
at some point
in the future

in one day

This phrase is correct and is used to indicate that something will happen within a period of 24 hours.

Use "in one day" when referring to an action or event that will take place within a single day. For example, "I can finish this project in one day."

Examples:

I will complete this task in one day.
The package will arrive in one day.
She painted the entire room in one day.
He ran a marathon in one day.
The repairs were done in one day.

Alternatives:

within a day
within 24 hours
in a day's time
in a single day

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one day vs in one day

one day

in one day

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