Get First/Last Datetime for a date

>>Script Language and Platform: TSQL/SQL Server 2000
If you apply a DatePart function to seperate the date and time, in this case, the index will not be used (because of function usage) and your query may take too much long time.

These two functions will ease your life if you assign the returned values to two variables in use those two variables in your query with syntax.

SELECT listOfColumns 
 FROM MyTable 
Where TransactionDateTime >= @StartDate And TransactionDateTime <= @endDate

Author: Anjum Niaz

SET QUOTED_IDENTIFIER ON 
GO
SET ANSI_NULLS ON 
GO

-- Returns first moment of any date, 
-- usefull function to be used 
-- to calculated before using in 
-- select statement. 
-- Highly recommended to optimize 
-- queries based on datetime 
-- conditions 

CREATE FUNCTION [GetStartDate]
        (
        @Date DateTime 
        )
RETURNS DateTime 
AS
        BEGIN
                
        RETURN Convert(DateTime, Convert(VarChar(30), @Date, 102) + '' 00:00:00.000 AM'', 121) 
        
        END

GO

CREATE FUNCTION [GetEndDate]
        (
        @Date DateTime 
        )
RETURNS DateTime 
AS
        BEGIN
                
        RETURN Convert(DateTime, Convert(VarChar(30), @Date, 102) + '' 11:59:59.998 PM'', 121) 
        
        END

GO 

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