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    <p>Baran's answer fixed and modified for SQL 2005</p> <p>SQL 2008 and above:</p> <pre><code>-- ============================================= -- Author: Baran Kaynak (modified by Kodak 2012-04-18) -- Create date: 14.03.2011 -- Description: 09:30 ile 17:30 arasındaki iş saatlerini hafta sonlarını almayarak toplar. -- ============================================= CREATE FUNCTION [dbo].[WorkTime] ( @StartDate DATETIME, @FinishDate DATETIME ) RETURNS BIGINT AS BEGIN DECLARE @Temp BIGINT SET @Temp=0 DECLARE @FirstDay DATE SET @FirstDay = CONVERT(DATE, @StartDate, 112) DECLARE @LastDay DATE SET @LastDay = CONVERT(DATE, @FinishDate, 112) DECLARE @StartTime TIME SET @StartTime = CONVERT(TIME, @StartDate) DECLARE @FinishTime TIME SET @FinishTime = CONVERT(TIME, @FinishDate) DECLARE @WorkStart TIME SET @WorkStart = '09:00' DECLARE @WorkFinish TIME SET @WorkFinish = '17:00' DECLARE @DailyWorkTime BIGINT SET @DailyWorkTime = DATEDIFF(MINUTE, @WorkStart, @WorkFinish) IF (@StartTime&lt;@WorkStart) BEGIN SET @StartTime = @WorkStart END IF (@FinishTime&gt;@WorkFinish) BEGIN SET @FinishTime=@WorkFinish END IF (@FinishTime&lt;@WorkStart) BEGIN SET @FinishTime=@WorkStart END IF (@StartTime&gt;@WorkFinish) BEGIN SET @StartTime = @WorkFinish END DECLARE @CurrentDate DATE SET @CurrentDate = @FirstDay DECLARE @LastDate DATE SET @LastDate = @LastDay WHILE(@CurrentDate&lt;=@LastDate) BEGIN IF (DATEPART(dw, @CurrentDate)!=1 AND DATEPART(dw, @CurrentDate)!=7) BEGIN IF (@CurrentDate!=@FirstDay) AND (@CurrentDate!=@LastDay) BEGIN SET @Temp = @Temp + @DailyWorkTime END --IF it starts at startdate and it finishes not this date find diff between work finish and start as minutes ELSE IF (@CurrentDate=@FirstDay) AND (@CurrentDate!=@LastDay) BEGIN SET @Temp = @Temp + DATEDIFF(MINUTE, @StartTime, @WorkFinish) END ELSE IF (@CurrentDate!=@FirstDay) AND (@CurrentDate=@LastDay) BEGIN SET @Temp = @Temp + DATEDIFF(MINUTE, @WorkStart, @FinishTime) END --IF it starts and finishes in the same date ELSE IF (@CurrentDate=@FirstDay) AND (@CurrentDate=@LastDay) BEGIN SET @Temp = DATEDIFF(MINUTE, @StartTime, @FinishTime) END END SET @CurrentDate = DATEADD(day, 1, @CurrentDate) END -- Return the result of the function IF @Temp&lt;0 BEGIN SET @Temp=0 END RETURN @Temp END </code></pre> <p>SQL 2005 and below:</p> <pre><code>-- ============================================= -- Author: Baran Kaynak (modified by Kodak 2012-04-18) -- Create date: 14.03.2011 -- Description: 09:30 ile 17:30 arasındaki iş saatlerini hafta sonlarını almayarak toplar. -- ============================================= CREATE FUNCTION [dbo].[WorkTime] ( @StartDate DATETIME, @FinishDate DATETIME ) RETURNS BIGINT AS BEGIN DECLARE @Temp BIGINT SET @Temp=0 DECLARE @FirstDay DATETIME SET @FirstDay = DATEADD(dd, 0, DATEDIFF(dd, 0, @StartDate)) DECLARE @LastDay DATETIME SET @LastDay = DATEADD(dd, 0, DATEDIFF(dd, 0, @FinishDate)) DECLARE @StartTime DATETIME SET @StartTime = @StartDate - DATEADD(dd, DATEDIFF(dd, 0, @StartDate), 0) DECLARE @FinishTime DATETIME SET @FinishTime = @FinishDate - DATEADD(dd, DATEDIFF(dd, 0, @FinishDate), 0) DECLARE @WorkStart DATETIME SET @WorkStart = CONVERT(DATETIME, '09:00', 8) DECLARE @WorkFinish DATETIME SET @WorkFinish = CONVERT(DATETIME, '17:00', 8) DECLARE @DailyWorkTime BIGINT SET @DailyWorkTime = DATEDIFF(MINUTE, @WorkStart, @WorkFinish) IF (@StartTime&lt;@WorkStart) BEGIN SET @StartTime = @WorkStart END IF (@FinishTime&gt;@WorkFinish) BEGIN SET @FinishTime=@WorkFinish END IF (@FinishTime&lt;@WorkStart) BEGIN SET @FinishTime=@WorkStart END IF (@StartTime&gt;@WorkFinish) BEGIN SET @StartTime = @WorkFinish END DECLARE @CurrentDate DATETIME SET @CurrentDate = @FirstDay DECLARE @LastDate DATETIME SET @LastDate = @LastDay WHILE(@CurrentDate&lt;=@LastDate) BEGIN IF (DATEPART(dw, @CurrentDate)!=1 AND DATEPART(dw, @CurrentDate)!=7) BEGIN IF (@CurrentDate!=@FirstDay) AND (@CurrentDate!=@LastDay) BEGIN SET @Temp = @Temp + @DailyWorkTime END --IF it starts at startdate and it finishes not this date find diff between work finish and start as minutes ELSE IF (@CurrentDate=@FirstDay) AND (@CurrentDate!=@LastDay) BEGIN SET @Temp = @Temp + DATEDIFF(MINUTE, @StartTime, @WorkFinish) END ELSE IF (@CurrentDate!=@FirstDay) AND (@CurrentDate=@LastDay) BEGIN SET @Temp = @Temp + DATEDIFF(MINUTE, @WorkStart, @FinishTime) END --IF it starts and finishes in the same date ELSE IF (@CurrentDate=@FirstDay) AND (@CurrentDate=@LastDay) BEGIN SET @Temp = DATEDIFF(MINUTE, @StartTime, @FinishTime) END END SET @CurrentDate = DATEADD(day, 1, @CurrentDate) END -- Return the result of the function IF @Temp&lt;0 BEGIN SET @Temp=0 END RETURN @Temp END </code></pre>
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