Ok I got confuse. So I need a helper column using WEEKNUM formula. I
thought this is a shorter way to sum up by weeks. Meaning if I have a
list of dates in column C of 2 years and cell E1 is the cell that
represent of the week number and column B contains the vaules. All i
have to do is to change the week number in cell E1 say week *2* then
the formula will sum up all the dates for the past 2 years that falls
on week 2. I do have a long formula for that but dummie me

But I thought that was the shorter version.
sorry about that.
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vane0326
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