To get the date according to my parameter value

• SqlUser-529296

  SSCarpal Tunnel

  Points: 4072

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  April 13, 2009 at 10:37 pm

  #155553

  Hi all,

  I want to get the date according to my parameter value. Parameter value should be tinyint.

  For Ex:

  ------

  Declare @test-2 NVARCHAR(128)

  Declare @test1 NVARCHAR(128) -- 'hh:mm'

  Declare @Exp tinyint

  SET @Exp = 10

  SET @test-2 = GETDATE()

  SELECT @test1 = DATEPART(dd,@Test) - @Exp

  SELECT @test1

  Here my result should be current date - the @Exp date. But if my @Exp value could be 30/more than that how can i

  achieve this? Moreover my @test1 parameter will be in 'hh:mm' format. For ex, my @Exp is 30. Then my result will be 14th of March 2009. How can i achieve this?

  Appreciated your help.

  ---

• Bruce W Cassidy

  SSChampion

  Points: 12668

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  April 13, 2009 at 10:50 pm

  #977025

  [font="Verdana"]I'm still not very clear on what you are trying to do.

  Have you looked at dateadd(), datediff() and convert() in SQL Server Books Online?

  [/font]

• SqlUser-529296

  SSCarpal Tunnel

  Points: 4072

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  April 13, 2009 at 11:03 pm

  #977031

  DECLARE @ExpDate int

  DECLARE @CurrentDate NVARCHAR(180)

  DECLARE @TimeElapsed NVARCHAR(180) -- 'hh:mm'

  DECLARE @RemainingTime NVARCHAR(180)

  SET @ExpDate = 13

  SET @TimeElapsed = '06:00' -- 'hh:mm'

  SET @CurrentDate = '2009-04-14 10:00:00.000'

  SELECT @RemainingTime = -- Some Logic

  My Result

  ---------

  The result is as follow:

  '2009-04-14 04:00:00.000'

• andrewd.smith

  SSCrazy Eights

  Points: 8444

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  April 14, 2009 at 2:19 am

  #977071

  I don't understand why you are using the nvarchar data type when doing these datetime calculations. What's wrong with the datetime data type?

• Sean Lange

  SSC Guru

  Points: 286590

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  April 14, 2009 at 8:06 am

  #977239

  Try something like:

  DECLARE @CurrentDate datetime

  DECLARE @TimeElapsed int

  DECLARE @RemainingTime datetime

  SET @TimeElapsed = 360 --converted from hh:mm to minutes

  SET @CurrentDate = '2009-04-14 10:00:00.000'

  SELECT @RemainingTime = dateadd(n, -1 * @TimeElapsed, @CurrentDate)

  Sean

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