Peter,

Assuming the actual start date of each week is Monday and you are not using
the 1904 date system then:

With any date within the the target week in A1

=A1-WEEKDAY(A1,3) will give the Monday start date. If the starting date is
a Sunday then it will give the previous Monday. If you want a Sunday to
show the next Monday, (ie the next day) then use:

=A1-WEEKDAY(A1,1)+2


HTH

Sandy

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"Peter W" wrote in message
...
I have previously been using weeknum function to produce reports in week
number order. Users now wish to see the actual start date of each week. Is
there a standard function to do this or do I need to create an algorithm?

Regards