fiscal year calculation in XSL?

Anyone have any insight on calculation 
of fiscal year?

Fiscal Year is basically every 3months, starting in
October, but using the first monday.
For instance, 

FQ4-2003 starts on 30.June.2003
FQ1-2004 starts on 29.Sept.2003
FQ2-2004 starts on 29.Dec.2003

Is there a good way, that anyone's aware, to not only
calculate the first day of a week, given a specific
date, the quarter and the year, but also add 7 days to
that date until we've added 12wks.??

thoughts?

thx.
Paul



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