in the first week of September vs on the first week of September

Both phrases are commonly used, but they are used in different contexts. 'In the first week of September' is correct when referring to an event or something that happens during that week. 'On the first week of September' is incorrect because 'on' is not typically used with time expressions like weeks.

Last updated: April 13, 2024 • 2290 views

This phrase is correct and commonly used in English.

"in the first week of September"

Use 'in the first week of September' when referring to an event or something that happens during that week.

Examples:

In the first week of September, we will be on vacation.
The project is due in the first week of September.

Show examples from the web [+]

Sep 9, 2020 ... Fires in Brazil's Amazon rainforest worsened in the first week of September and are increasingly spreading into areas of untouched forest, ...
of the Central Mail Server was carried out in the first week of September, and the transfer of operations took place by [...] 1 October 2001. osce.org.
Sep 13, 2022 ... New monkeypox cases in the United States have been steadily dropping in recent weeks, with cases reported in the first week of September cut ...
Sep 4, 2008 ... September is considered the peak of the Atlantic Ocean hurricane season, and in the first week of September there were four tropical ...
The Department of Taxation will begin issuing Act 115 refunds in the first week of September 2022. The estimated Act 115 Refund delivery dates are in the ...
A damaged oil well northwest of Western Australia continued to leak fuel into the Timor Sea in the first week of September 2009. This natural-color image ...
Dec 1, 1996 ... Chile: Information on military or guerrilla raids at the University of Talca in the first week of September 1986 and at the Catholic ...
Compared to a year ago, US oil production in the first week of September increased by more than 40%. In just the last two years, oil production in “Saudi ...
Sep 3, 2022 ... Forecasters are indicating that Hinnamnor might head for South Korea or southern Japan in the first week of September.

This phrase is incorrect in English. 'On' is not typically used with time expressions like weeks.

"on the first week of September"

Show examples from the web [+]

[...] the Chapelco tetrathlon is held on the first week of September. This is one of the most important ...
Sep 9, 2022 ... After the pandemic shuffled these dates and locales, The Armory last year settled on the first week of September, which also overlaps with ...
May 21, 2019 ... starting on the first week of September 2019 (09/05/2019). UAT is estimated to be completed during the second week of October 2019 ...
I am planning to drive a 12 seat van on the first week of September, just wanted to know how safe it is to drive a big vehicle like a 12 seat van on the ...
Oscar Turner of Ballard County, dubbed the “Brains of the Senate,” visited Hickman on the first week of September. A funeral was planned for Peter Hamilton ...
Traffic on the John Muir Trail from back on the first week of September - zoom. A look back down Pine Creek Pass as the snow storm on Halloween weekend '19.
Booked holidays with my two teenage daughters on the first week of September and absolutely loved it from the first day till the last minute.
possession and sells the seed in the spot market on the first week of September, the manager buys back the same number of futures contracts to lift the ...

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in the first week of September vs on the first week of September