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SQL Date Extrapolation

Posted on 2005-03-15
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Last Modified: 2008-03-06
Does anyone have a function that I could for instance pass the following:

   - Month
   - Year
   - Number between 1 and 5
   - DayofWeek (1=Sunday,2=Monday, etc...)

So I if I were to pass in 3,2005,1,1 the function would return the date of the first sunday in March of 2005

or

If I passed 3,2005,2,2 I would get a date which represented the 2nd Monday in March of 2005.  

If the info entered would retrun an error the function should return 'ERROR' or something like that.

I really need this function.
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Question by:Steve Groner
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3 Comments
 
LVL 15

Accepted Solution

by:
mcmonap earned 1000 total points
ID: 13553179
Hi sgroner,

Check this out, I think it should do what you want, it is a bit lazy as I am relying on implicit conversion of the varchars to ints but it works okay:

CREATE FUNCTION dbo.specificDate(@month VARCHAR(2), @year CHAR(4), @occurance INT, @day INT)
RETURNS SMALLDATETIME
AS
BEGIN

DECLARE @count INT
DECLARE @date SMALLDATETIME

SET @count = 1
SET @date = @year+'-'+@month+'-01'

WHILE @count <= @occurance
BEGIN
      IF DATEPART(dw,@date) = @day
            IF @count = @occurance
                  RETURN @date
            ELSE
            BEGIN
                  SET @date = DATEADD(dd,1,@date)
                  SET @count = @count+1
            END
      ELSE SET @date = DATEADD(dd,1,@date)
END
RETURN @date
END
GO

SELECT dbo.specificDate(3,2005,2,2)
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LVL 15

Expert Comment

by:mcmonap
ID: 13554296
Hi sgroner,

Should have added that this will just keep going on the number of occurances so if you enter:
SELECT dbo.specificDate(3,2005,19,2)
It will return the 19 monday from the start of March 2005 (2005-07-11)

Also the function returns a small datetime since you don't appear to be worried about any time aspect of function.
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LVL 1

Author Comment

by:Steve Groner
ID: 13558254
Thanks for the function with a little modifcation I was able to get exactly what I needed.
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