I don't think so.

However, you can try a workaround.
To test enter first day of every month in Col A
enter this in B1 and copy down
=WEEKNUM(A1,1)
now enter this in C1 and copy down to get the weeknum you want
=IF(B1<$B$4,B1+52-$B$4,B1-$B$4+1)

You can adapt it for each week or each date
Note: I am nnot sure whether one should use 52 or 53 in the above formula...

"Trevor Aiston" wrote:

Is there a switch/way in excel to return week numbers from a date other than
1st Jan.

I would like to be able to calculate the weeknumber from 1st april-31st
march our financial year.

Thanks

Trevor