Date Extension

I've been using Michaels excellent date function http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=61519 quite honestly it has saved me loads of time (the e-beers are on me)

For my purposes I need to work sometimes with Financial Years and I also need the Dates available to SQL Server 7. So I used Michaels function to create a table and added two fields (possibly more to follow). Please note that this has only been done on SQL Server 2000

ALTER TABLE DATEINFO
ADD -- Needs these to allow NULL so that the Alter Table will work.
FINANCIAL_YEAR_START_DATE[datetime]null , -- the start date for the financial year
FINANCIAL_YEAR_START_YEAR[smallint]null , -- the year that the financial years starts in depending on the Financial Year Start Date

Given that the table is then populated by Michaels function, to set the FINANCIAL_YEAR_START_DATE I used



/* @ARBITRARY_FINANICAL_YEAR_START_DATE is SET to any date that would be the start date of a financial year
only the day and month parts are important, so in this case the start of the financial year is 1 April
*/
DECLARE @ARBITRARY_FINANCIAL_YEAR_START_DATE DATETIME
SET @ARBITRARY_FINANCIAL_YEAR_START_DATE = '20060401'
UPDATE DATEINFO
SET FINANCIAL_YEAR_START_DATE =
CASE
WHEN DATEDIFF(dd,DATEADD(yy, year([DATE]) - YEAR(@ARBITRARY_FINANCIAL_YEAR_START_DATE), @ARBITRARY_FINANCIAL_YEAR_START_DATE),[DATE]) < 0
Then DATEADD(YY,YEAR([DATE])- YEAR(@ARBITRARY_FINANCIAL_YEAR_START_DATE) -1, @ARBITRARY_FINANCIAL_YEAR_START_DATE)
Else DATEADD(YY,YEAR([DATE])- YEAR(@ARBITRARY_FINANCIAL_YEAR_START_DATE) , @ARBITRARY_FINANCIAL_YEAR_START_DATE)
END

With that it is trivial to set FINANCIAL_YEAR_START_YEAR to YEAR(FINANCIAL_YEAR_START_DATE)

steve


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Don't worry head. The computer will do all the thinking from now on.