=INT((A1-DATE(2005,2,1))/7)+(WEEKDAY(A1)<7)

--
HTH

Bob Phillips

<evlai@hotmail.com> wrote in message
news:1127314586.929249.152250@g14g2000cwa.googlegroups.com...
> Hi,
>
> I would like to know how to calculate fiscal week of the year. for
> example, the first week of the year is started from Feb 1, 2005 instead
> of Jan.
>