on day one vs in day one

The correct phrase is 'on day one.' 'On day one' is the appropriate preposition to use when referring to a specific day in a sequence. 'In day one' is not a common or correct phrase in English.

Last updated: March 30, 2024 • 2311 views

This phrase is correct and commonly used in English.

"on day one"

Use 'on day one' when referring to a specific day in a sequence, such as the first day of an event or project.

Examples:

On day one of the conference, all attendees received a welcome package.
We need to finalize the budget on day one of the project.
On day one of the trip, we visited the famous landmarks in the city.
The new employee impressed everyone on day one of her job.
On day one of the competition, the team set a new record.

Show examples from the web [+]

A child's adjustment starts on day one, especially for trauma victims.
So on day one, we knew we had good apples.
on day one, possibly repeated once within three days
ECALTA is given as an initial dose of 200 mg on day one, followed by 100 mg each day from day two.
I'm not settling into traditional gender roles on day one of my marriage.
Why didn't I just kidnap you on day one?
Sure, they have lectures and hospital rotations too, but community-based learning starts on day one.
And so we're starting on day one.
A simple puzzle I solved on day one.
A $3 million bust on day one.
Let's not blow it on day one.
We learn that on day one.
Just shove a joystick in their clammy mitts on day one.
Docetaxel was administered as a 1-hour infusion, all other medicinal products were given as intravenous bolus on day one.
The cops decided on day one that it must have been me.
Me and Ben mapped the dome on day one.
Brick was on day one of the most dreaded week of his year.
You know, I spend eight months reeling her in, and you're prepared to burn her on day one.
You better hope your people did their job, or our case is sunk on day one.
That should be good enough to put her in first place on day one.

This phrase is not correct in English usage.

"in day one"

Show examples from the web [+]

The jobless recovery chart buried in Day One, Job One, pick-a-bale-of-cotton, seems to imply that the Obama recovery took place in 2007 when Obama wasn't president.
I still don't need to rub it in her face day one in the triple dorm room.
We want Parliament to be genuinely involved from day one in the implementation of this agreement.
It is unacceptable that every day one in five women in Europe suffers violence.
He was in your corner from day one.
We've infiltrated and maneuvered all the players in this experiment since day one.
We learned that in marshal academy day one!
In the coming days one needs to start devise actions to rehabilitate basic services that allow people to survive.
He slaughtered 20,000 in one day.
Day one in the Browning house. It's moving in day Been going at it since pretty early this morning.
We've lost two commanders in chief in one day.
Take your seats, for day one in the Big Brother house.
Zoila has had it in for me from day one.
"She had a tornado-like quality in our lives from day one".
That should be good enough to put her in first place on day one.
Way we heard it, you had it in for Laura from day one.
Finley has been a thorn in his side since day one, but if he'd wanted him dead, he'd have done it by now.
In fact, I've been in town since day one, And I've left you alone.
In one day and one night?
You do it every day in one direction.

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on day one vs in day one

"on day one"

"in day one"

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