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How do I calculate a week number based on a field?

How do I calculate a week number based on a field?
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Im trying to calculate a week number of a submitted report. Im guessing the way to go about this as I capture the date the user is referring to I can calculate which week number that date falls in? my question is how do I do it? I tried

=Format([TimesheetTableTemp]![Task Date],"ww")

where the task date is the location of the date but I get a prompt and then error
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Access 2007, Crosstab query .Evening - We've just started opening our business on a Sunday and this little issue has just manifested itself!We record volumes of calls previously just Monday to Saturday and the call volumes are grouped by week number.

Which worked fine, now we open Sunday the Sunday values are pushed to the next week number. The customer wants all data for the week grouped Monday to Sunday, otherwise I'd just let the pushed week roll into the next week.

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