Calculate business hours between two dates

How can I calculate business hours between two dates? For example we have two dates; 01/01/2010 15:00 and 04/01/2010 12:00 And we have working hours 09:00 to 17:00 in weekdays How can I calculate working hours with sql?

Solution 1:

Baran's answer fixed and modified for SQL 2005

SQL 2008 and above:

-- =============================================
-- 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<@WorkStart)
    BEGIN
        SET @StartTime = @WorkStart
    END
    IF (@FinishTime>@WorkFinish)
    BEGIN
        SET @FinishTime=@WorkFinish
    END
    IF (@FinishTime<@WorkStart)
    BEGIN
        SET @FinishTime=@WorkStart
    END
    IF (@StartTime>@WorkFinish)
    BEGIN
        SET @StartTime = @WorkFinish
    END

    DECLARE @CurrentDate DATE
    SET @CurrentDate = @FirstDay
    DECLARE @LastDate DATE
    SET @LastDate = @LastDay

    WHILE(@CurrentDate<=@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<0
    BEGIN
        SET @Temp=0
    END
    RETURN @Temp

END

SQL 2005 and below:

-- =============================================
-- 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<@WorkStart)
    BEGIN
        SET @StartTime = @WorkStart
    END
    IF (@FinishTime>@WorkFinish)
    BEGIN
        SET @FinishTime=@WorkFinish
    END
    IF (@FinishTime<@WorkStart)
    BEGIN
        SET @FinishTime=@WorkStart
    END
    IF (@StartTime>@WorkFinish)
    BEGIN
        SET @StartTime = @WorkFinish
    END

    DECLARE @CurrentDate DATETIME
    SET @CurrentDate = @FirstDay
    DECLARE @LastDate DATETIME
    SET @LastDate = @LastDay

    WHILE(@CurrentDate<=@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<0
    BEGIN
        SET @Temp=0
    END
    RETURN @Temp

END

Solution 2:

I know this is post is very old but here is a function I wrote recently to calculate Business Hours/Minutes between any two events. It also takes into account any holidays which must be defined in a table.

The function returns the interval in minutes - you can divide by 60 to get hours as required.

This has been tested on SQL Server 2008. Hope it helps someone.

Create Function GetWorkingMin(@StartDate DateTime, @EndDate DateTime, @Country Varchar(2)) Returns Int
AS
Begin
    Declare @WorkMin int = 0   -- Initialize counter
    Declare @Reverse bit       -- Flag to hold if direction is reverse
    Declare @StartHour int = 9   -- Start of business hours (can be supplied as an argument if needed)
    Declare @EndHour int = 17    -- End of business hours (can be supplied as an argument if needed)
    Declare @Holidays Table (HDate DateTime)   --  Table variable to hold holidayes

    -- If dates are in reverse order, switch them and set flag
    If @StartDate>@EndDate 
    Begin
        Declare @TempDate DateTime=@StartDate
        Set @StartDate=@EndDate
        Set @EndDate=@TempDate
        Set @Reverse=1
    End
    Else Set @Reverse = 0

    -- Get country holidays from table based on the country code (Feel free to remove this or modify as per your DB schema)
    Insert Into @Holidays (HDate) Select HDate from HOLIDAY Where COUNTRYCODE=@Country and HDATE>=DateAdd(dd, DateDiff(dd,0,@StartDate), 0)

    If DatePart(HH, @StartDate)<@StartHour Set @StartDate = DateAdd(hour, @StartHour, DateDiff(DAY, 0, @StartDate))  -- If Start time is less than start hour, set it to start hour
    If DatePart(HH, @StartDate)>=@EndHour+1 Set @StartDate = DateAdd(hour, @StartHour+24, DateDiff(DAY, 0, @StartDate)) -- If Start time is after end hour, set it to start hour of next day
    If DatePart(HH, @EndDate)>=@EndHour+1 Set @EndDate = DateAdd(hour, @EndHour, DateDiff(DAY, 0, @EndDate)) -- If End time is after end hour, set it to end hour
    If DatePart(HH, @EndDate)<@StartHour Set @EndDate = DateAdd(hour, @EndHour-24, DateDiff(DAY, 0, @EndDate)) -- If End time is before start hour, set it to end hour of previous day

    If @StartDate>@EndDate Return 0

    -- If Start and End is on same day
    If DateDiff(Day,@StartDate,@EndDate) <= 0
    Begin
        If Datepart(dw,@StartDate)>1 And DATEPART(dw,@StartDate)<7  -- If day is between sunday and saturday
            If (Select Count(*) From @Holidays Where HDATE=DateAdd(dd, DateDiff(dd,0,@StartDate), 0)) = 0  -- If day is not a holiday
                If @EndDate<@StartDate Return 0 Else Set @WorkMin=DATEDIFF(MI, @StartDate, @EndDate) -- Calculate difference
            Else Return 0
        Else Return 0
    End
    Else Begin
        Declare @Partial int=1   -- Set partial day flag
        While DateDiff(Day,@StartDate,@EndDate) > 0   -- While start and end days are different
        Begin
            If Datepart(dw,@StartDate)>1 And DATEPART(dw,@StartDate)<7    --  If this is a weekday
            Begin
                If (Select Count(*) From @Holidays Where HDATE=DateAdd(dd, DateDiff(dd,0,@StartDate), 0)) = 0  -- If this is not a holiday
                Begin
                    If @Partial=1  -- If this is the first iteration, calculate partial time
                    Begin 
                        Set @WorkMin=@WorkMin + DATEDIFF(MI, @StartDate, DateAdd(hour, @EndHour, DateDiff(DAY, 0, @StartDate)))
                        Set @StartDate=DateAdd(hour, @StartHour+24, DateDiff(DAY, 0, @StartDate)) 
                        Set @Partial=0 
                    End
                    Else Begin      -- If this is a full day, add full minutes
                        Set @WorkMin=@WorkMin + (@EndHour-@StartHour)*60        
                        Set @StartDate = DATEADD(DD,1,@StartDate)
                    End
                End
                Else Set @StartDate = DATEADD(DD,1,@StartDate)  
            End
            Else Set @StartDate = DATEADD(DD,1,@StartDate)
        End
        If Datepart(dw,@StartDate)>1 And DATEPART(dw,@StartDate)<7  -- If last day is a weekday
            If (Select Count(*) From @Holidays Where HDATE=DateAdd(dd, DateDiff(dd,0,@StartDate), 0)) = 0   -- And it is not a holiday
                If @Partial=0 Set @WorkMin=@WorkMin + DATEDIFF(MI, @StartDate, @EndDate) Else Set @WorkMin=@WorkMin + DATEDIFF(MI, DateAdd(hour, @StartHour, DateDiff(DAY, 0, @StartDate)), @EndDate)
    End 
    If @Reverse=1 Set @WorkMin=-@WorkMin
    Return @WorkMin
End