How do I Fiscal implement a Fiscal Week # Function From Table with Dates

Hello -
We have a new table format for fiscal year 2009. I used to be able to pull the fiscal week no. from 1-52. Now, I will need a function in the queries to calculate the fiscal week no. How do I do that based on the data  below? The fiscal week below represents the fiscal week number in the month, not the fiscal week no. for the year which I also need. Thanks!

FWeekNo.      FMonthNo.      FiscalYear      FiscalWeekStartDate      FiscalWeekEndDate
1      1      2009      6/28/2008 0:00      7/4/2008 23:59
2      1      2009      7/5/2008 0:00      7/11/2008 23:59
3      1      2009      7/12/2008 0:00      7/18/2008 23:59
4      1      2009      7/19/2008 0:00      7/25/2008 23:59
5      1      2009      7/26/2008 0:00      8/1/2008 23:59
1      2      2009      8/2/2008 0:00      8/8/2008 23:59
2      2      2009      8/9/2008 0:00      8/15/2008 23:59
3      2      2009      8/16/2008 0:00      8/22/2008 23:59
4      2      2009      8/23/2008 0:00      8/29/2008 23:59
1      3      2009      8/30/2008 0:00      9/5/2008 23:59
2      3      2009      9/6/2008 0:00      9/12/2008 23:59
3      3      2009      9/13/2008 0:00      9/19/2008 23:59
4      3      2009      9/20/2008 0:00      9/26/2008 23:59
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chapmandewConnect With a Mentor Commented:
No reason to create a function for it....just use a dates table and use a simple it, you can add fields for your fiscal week start date and end date so if you ever have to query for them you won't have any complex functions to deal with (depending on if your fiscal year & weeks are complex).,3800010795,62041605,00.htm
select datepart(week,FiscalWeekStartDate  ) from Table    
savethedayAuthor Commented:
This returns the calendar week of the fiscalweekstartdate. I need the fiscal week. For example fiscalweekstartdate of 2008-06-28 00:00:00 is the 26th calendar week, but the 1st fiscal week.
I need a function that returns the fiscal week starting from this date and carrying to week 53 as of
2009-06-27 00:00:00
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savethedayAuthor Commented:
sbagireddi -

Would you give me an example of how to use this if our fiscal year always starts in July, and the fiscal week always starts on Saturday. That is, do I need to change anything in the function? Today's date is returning 200750 as is. The week is correct, but not 2007.

chapmandew -
This is a good solution. Unfortunately for dates we cannot add tables for exactly the reason you mentioned - glitches in tables would wreak havoc on reports (not picking up leap years for example), so our IT dept has to publish an official table and we work with it from there.
Have your IT dept publish it then...its all in the creation of the table.  If you create it with leap years then they will be included.
sbagireddiConnect With a Mentor Commented:
You will need to hack the function above to suit your needs.
If thats too much of a hassle I would just go with a calendar table as suggested by chapmandew above.

I found another example of it:
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