in first week vs at first week

'In the first week' is the proper English phrasing—it is the appropriate preposition to use when referring to a specific time period. 'At the first week' is not commonly used in this context.

Explained by Gregg
Editor at TextRanch

Last updated: February 17, 2025 • 6748 views

'In first week' is not a correct construction in English.

"in first week"

The correct phrase is 'in the first week' when referring to a specific time period.

Alternatives:

in the first week

'At first week' is not a commonly used phrase in English.

"at first week"

The correct preposition to use when referring to a specific time period is 'in the first week.'

Show examples from the web [+]

The Russian Duma passed a bill imposing restrictions on NGOs at first reading last week.
Here's the knowledge I've accumulated my first week at Hearst...
Since my first week at the office.
We were together since the first week at Pratt.
I can't believe this is how my first week at school is turning out.
Good work, Jacky. Nice first week at the Cargo. Thanks, chef.
My first week at NYADA, and the most surprising thing about college is it's just like high school.
I'm sorry. It's just that this is my first week at work.
When I spent my first weeks at Panzi hospital I sat with women who sat and lined up every day to tell me their stories.
It was my first week at Christian camp.
At least once a week at first, and your blood will have to be tested.
He's still at the first two weeks in December.
How would you describe your first week at home?
My first weeks at Fort Marshall, total disaster.
Panretin is usually applied for up to 12 weeks at first, and treatment continued after this period only on lesions which have responded to treatment.
Mike, the National Parents Group cut the cord on supporting Families First at next week's press event.
Significant response was first observed at Week 2 and maintained through 24 weeks (Table 10).
And you'll get your first look at next week's episode of Teen Wolf, presented by ATT.
My wife Teri just had our first baby at 37 weeks.
Our fears are based, for example, on the cyanide pollution of the River Tisza caused by the mining accident in Baia Mare in 2000 and the pollution of the river at Borsabánya in the first week of September this year.

Alternatives:

in the first week

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in first week vs at first week

"in first week"

"at first week"

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