could try adding dsum's together?

if not try an array function

=sum(if((A1:A200=weekstartdate1)*(A1:A200=weekstar tdate2)*(A1:A200=weekstartdate3)*(A1:A200=weekstar tdate4)*(A1:A200=weekstartdate5),B1:B200))

where A:A contains your week start dates and B:B contains your column
to sum.

the * represents an AND
you can use a + to represent OR

You need to press and hold Ctrl+Shift when pressing Enter having typed
these formula to tell Excel that it is an array function. it should
then appear in the Formula bar with {} around it.

(note that if you either reference a whole column or use lots of these
in a spreadsheet you will absorb system resources; shouldn't be a
problem if you are using a few)

Have you considered a Pivot table?


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