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# T-SQL WorkingDay report

Posted on 2011-03-02
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I have a number of hours remaining on a task (Ex: 60 hours).

The working Day are Monday to Friday, we are estimating that we can only work 6 hours by working day.

ex:
2011-03-02 I have 60 hours remaining
so I have 10 working day left to work
The task should be finish on 2011-03-15

How can I calculate the completion date in SQL 2005?

``````-- SOMETHING LIKE THIS
DECLARE @RemainingHours FLOAT
SET @RemainingHours = 60
SELECT
DATEADD(DD, @RemainingHours / 6 * 1.40, GETDATE())
``````
0
Question by:Cboudroz

LVL 15

Expert Comment

ID: 35019267
SELECT DATEDIFF(day,  GETDATE(), getdate()+3) * 10

this will return the days between two dates and multiply bt 10 hours per day
0

LVL 15

Expert Comment

ID: 35019418
DECLARE
@RemainingHours FLOAT,
@EndDate datetime,
@NewEndDate datetime

SET @RemainingHours = 65

--add 1 week for every 30 hours, calculate remainder
select
@EndDate = dateadd(ww, convert(int, @remaininghours / 30), getdate()-1),
@RemainingHours = @RemainingHours - (30 * convert(int, @RemainingHours / 30))

select
getdate(),
@EndDate,
@RemainingHours

--add extra days from remainder (rounding up, 1 extra hour = the following day)
select
@NewEndDate = dateadd(dd, ceiling(@RemainingHours / 6), @EndDate)

--account for weekends
select
@NewEndDate =
case
when datepart(dw, @NewEndDate) = 7  -- if it is saturday, move to monday
or datepart(dw, @NewEndDate) < datepart(dw, @EndDate) then dateadd(dd, 2, @EndDate) -- if the weekend passed, then add 2 days since sat/sun don't count
else @NewEndDate
end

select
@NewEndDate

0

LVL 22

Expert Comment

ID: 35019544
I would modify derekkromm's response by adding 3 more input parameters, one for @HrsPerDay (INT Default = 6), one for @WorkSaturday (Char(1) Default = N) and one for @WorkSunday (Char(1) Default = N).  That would let you also cover cases where the pressure is really on and you are required (or you elect) to work Saturdays, Sundays, or both.  I would then use those to add @HrsPerDay or (@HrsPerDay * 2) in order to handle estimating the completion date based upon the additional information.
0

LVL 7

Author Comment

ID: 35020782
derekkromm:

It's not working for some hours.

SET @RemainingHours = 19
...
SET @RemainingHours = 29

will give tomorrow date.
0

LVL 15

Accepted Solution

derekkromm earned 500 total points
ID: 35020833
sorry, small typo in the case statement at the bottom (changed dateadd(dd, 2, @EndDate) to dateadd(dd, 2, @NewEndDate)

``````DECLARE
@RemainingHours FLOAT,
@EndDate datetime,
@NewEndDate datetime

SET @RemainingHours = 29

--add 1 week for every 30 hours, calculate remainder
select
@EndDate = dateadd(ww, convert(int, @remaininghours / 30), getdate()-1),
@RemainingHours = @RemainingHours - (30 * convert(int, @RemainingHours / 30))

select
getdate(),
@EndDate,
@RemainingHours

--add extra days from remainder (rounding up, 1 extra hour = the following day)
select
@NewEndDate = dateadd(dd, ceiling(@RemainingHours / 6), @EndDate)

--account for weekends
select
@NewEndDate =
case
when datepart(dw, @NewEndDate) = 7  -- if it is saturday, move to monday
or datepart(dw, @NewEndDate) < datepart(dw, @EndDate) then dateadd(dd, 2, @NewEndDate) -- if the weekend passed, then add 2 days since sat/sun don't count
else @NewEndDate
end

select
@NewEndDate
``````
0

LVL 7

Author Comment

ID: 35021939
derekkromm:

Thanks for your help, I wasn't able to figure out the logic to used.

I created my function and everything work as expected.

``````ALTER FUNCTION fct_TaskEndDate_GET
(
-- Add the parameters for the function here
@RemainingHours			FLOAT,
@WorkingHoursInWeek		INT,
@StratingDate			SMALLDATETIME
)
RETURNS SMALLDATETIME
AS
BEGIN
-- Declare the return variable here
DECLARE @EndDate		SMALLDATETIME
DECLARE @WeekEndDate	SMALLDATETIME

IF @RemainingHours < 1
BEGIN
SET @EndDate = @StratingDate
RETURN @EndDate

END

--add 1 week for every @WorkingHoursInWeek hours
SET	@WeekEndDate	= dateadd(ww, convert(int, @remaininghours / @WorkingHoursInWeek), @StratingDate-1)
SET @RemainingHours = @RemainingHours - (30 * convert(int, @RemainingHours / 30))

--add extra days from remainder (rounding up, 1 extra hour = the following day)
SET @EndDate = dateadd(dd, ceiling(@RemainingHours / (convert(int, @WorkingHoursInWeek / 5) )), @WeekEndDate)

--account for weekends
SET @EndDate =
CASE

WHEN datepart(dw, @EndDate) = 7	-- if it is saturday, move to monday
or datepart(dw, @EndDate) < datepart(dw, @WeekEndDate) then dateadd(dd, 2, @EndDate) -- if the weekend passed, then add 2 days since sat/sun don't count
ELSE @EndDate
END

-- Return the result of the function
RETURN @EndDate

END
GO
``````
0

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