Which preposition should come along with "Week Number?"

English as a Second Language
1

Hi,
When I write some business emails, I usually encounter stating Week number like this.

I hope you to ship ABC goods on(?) / at(?) / in(?) week number 09.

Looking back upon my history, some colleague uses “on” with week number ##.
However I am not sure which one is suitable for being used with week number ##.

FYI) ## denotes digits like 1, 2, 3, 4, 5 and stuff.

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2

The best preposition here would probably be ‘in’ since we don’t use ‘on’ or 'at in connection with ‘week’.

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3

Hi
As always thank you! :smiley:

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4

Yes, I agree with Torsten.
But let me add my two cents. Week Number 09 means Ninth Week. A week is a period that spans seven days.
So, “I hope you will ship ABC goods in week number 09” or “I expect you to ship ABC goods in the ninth week” will be better for the preposition in is appropriate here.

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5

If you are not sure which part of the week something will be sent/delivered, you can simply 'say “during week 9-”:

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