Calculating the Number of Business Hours Passed Since a Point of Tme

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Calculating the Number of Business Hours Passed Since a Point of Tme

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Mazharuddin Ehsan

Posted Wednesday, November 28, 2007 1:17 AM

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Comments posted to this topic are about the item Calculating The Number Of Business Hours Passed Since a Point of Time

Friends,
As the saying goes ‘Time is money’. Here is a way to compute this precious commodity.
The motivation to write this came from a friend at my workplace who was in dire need of this solution to use in his reporting tool. Then I saw this posting on the SQLserverCentral
Want to Calculate Business Working hours
and decided to write for the community.

As you see, the whole logic is built upon DATEDIFF and DATEADD functions.

The comments of some of the readers motivated me to do enhancements in the solution:
1. To calculate duration between two values of time.
2. Considering the holidays.

See the attachment for the details.

Sincererly,
Mazharuddin
MCITP, Developer & Admin

-----------------------------------------------------------
Time Is Money
Calculating the Number of Business Hours Passed since a Point of Time
Calculating the Number of Business Hours Passed Between Two Points of Time

Post Attachments

CalculatingDurationOfOfficeHoursPassedBetweenTwoPointsOfTime.doc (556 views, 51.50 KB)

Post #426732

carlosdanielsousa

Posted Thursday, December 27, 2007 4:40 AM

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Your work is working perfect on a calculation of SLA for my service desk.
I would like to know if it is possible to include holidays e the calculation.

Post #436607

Mazharuddin Ehsan

Posted Friday, December 28, 2007 5:26 AM

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Incidently, I am also using this solutuion to calculate and report the duration passed for the unresolved IT HelpDesk cases at my work place. The results are displayed on an overhead dashboard for everyone to see.

It can be used for other scenarios which requiere to calculate the time consumed in completing tasks.

As I mentioned in the documentation

[/quote]
The code can be modified to suit any other working hours and days pattern. I used this code to calculate the actual number of working hours passed since a job was started. It can be modified to calculate the number of working hours taken to complete tasks (The function CalcTimeSinceCreated will have to be modified to take two parameters in that case as 'task beginning date&time' and 'task ending date&time', instead of one at present)[quote]

To integrate holidays in this solution you need to modify something as follows:
1. Store all the holidays in a table Holidays (which has a field DateOff)
2. Modify the Function 8 [CalcTimeSinceCreated] as follows:
while (1 = 1)
begin
if dbo.DateAtMidnight(@VarCalcCreateDate) in (select dbo.DateAtMidnight(DateOff) from Holidays)
set @VarCalcCreateDate = dbo.DateAt730(@VarCalcCreateDate + 1)

I hope you manage to do the enhancement.

Regards,
Maz

-----------------------------------------------------------
Time Is Money
Calculating the Number of Business Hours Passed since a Point of Time
Calculating the Number of Business Hours Passed Between Two Points of Time

Post #437000

carlosdanielsousa

Posted Friday, December 28, 2007 7:54 AM

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Hello again, tnx for the answer!
I've now another problem, since i have to recalcute all the history of my service desk to show in a report, i've to change your code to accept the start and the end date.

I've change your code to accept two parameters, start date and End Date, but when i change the getdate() to enddate parameter, when i execute the function "select dbo.ufninc_CalcTimeSinceCreated (getdate(),getdate()+1)" it return 9 hours instead of the 8 hours.
Do you know why?

Post #437056

Mazharuddin Ehsan

Posted Friday, December 28, 2007 9:07 AM

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Last Login: Thursday, May 16, 2013 11:55 AM
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Clearly it is a logical error. At least your code is free from any syntax error. Check carefully. My original program deducts 0.5 hours for the lunch period each day. Possibly the error is around this point.

-----------------------------------------------------------
Time Is Money
Calculating the Number of Business Hours Passed since a Point of Time
Calculating the Number of Business Hours Passed Between Two Points of Time

Post #437095

carlosdanielsousa

Posted Friday, December 28, 2007 9:26 AM

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you where right! tnx for the answer and for the short waiting time!
I changed 1800s to 5400s that is my lunch time, and the code work just like it should!
best regards

Carlos Sousa, Portugal

Post #437106

Mazharuddin Ehsan

Posted Saturday, December 29, 2007 8:07 AM

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Wonderful! Do you mean that you have 1.5 hours of lunch break at your work place. I envy you.

-----------------------------------------------------------
Time Is Money
Calculating the Number of Business Hours Passed since a Point of Time
Calculating the Number of Business Hours Passed Between Two Points of Time

Post #437326

carlosdanielsousa

Posted Thursday, January 03, 2008 4:15 AM

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it's good to have such a big lunch time!

I'm having another problem, when i make
select dbo.CalcTimeSinceCreated(convert(datetime,'31-12-2007',105),convert(datetime,'02-01-2008',105))

And i've an holiday in my database for the date (01-01-2008),
it goes to a infinite cicle.

but when i make
select dbo.CalcTimeSinceCreated(convert(datetime,'31-12-2007',105),convert(datetime,'03-01-2008',105))

all works fine! do you know why?

Post #438311

Mazharuddin Ehsan

Posted Thursday, January 03, 2008 5:01 AM

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Last Login: Thursday, May 16, 2013 11:55 AM
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I think I can resolve the issue if I see your modified code. Apparently it is not able to get out of the loop if the previous day of the second parameter is a holiday. You need to kill this bug.

-----------------------------------------------------------
Time Is Money
Calculating the Number of Business Hours Passed since a Point of Time
Calculating the Number of Business Hours Passed Between Two Points of Time

Post #438324

carlosdanielsousa

Posted Thursday, January 03, 2008 6:21 AM

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DataAMeiaNoite = dateatmidnight
DataInicioTrab= dateAt730
DataAlmocoInicio = dateAt1130
DataAlmocoFim= dateAt12
DataFIMTrab = dateAt16
DataInicio= startDate
DataFim= endDate

ALTER function [dbo].[ufninc_CalcTimeSinceCreated](@DataInicio DateTime,@DataFim DateTime)

returns real
as
begin
declare @CalcHours real
declare @VarCalcCreateDate datetime
if dbo.ufninc_DataAMeiaNoite(dbo.ufninc_CalcCreateDate(@DataInicio)) = dbo.ufninc_DataAMeiaNoite(dbo.ufninc_CalcGetDate(@DataFim))
set @CalcHours =
case
when dbo.ufninc_CalcCreateDate(@DataInicio) = dbo.ufninc_DataAlmocoInicio(dbo.ufninc_CalcGetDate(@DataFim)) then
round(((cast(datediff(ss, dbo.ufninc_CalcCreateDate(@DataInicio), dbo.ufninc_CalcGetDate(@DataFim)) as real)-5400)/3600),2)
else
round((cast(datediff(ss, dbo.ufninc_CalcCreateDate(@DataInicio), dbo.ufninc_CalcGetDate(@DataFim )) as real)/3600),2)
end
else
begin
set @CalcHours =
case
when
dbo.ufninc_CalcCreateDate(@DataInicio) <= dbo.ufninc_DataAlmocoInicio(dbo.ufninc_CalcCreateDate(@DataInicio)) then
round(((cast(datediff(ss, dbo.ufninc_CalcCreateDate(@DataInicio), dbo.ufninc_DataFimTrab(dbo.ufninc_CalcCreateDate(@DataInicio))) as real)-5400)/3600),2)
else
round((cast(datediff(ss, dbo.ufninc_CalcCreateDate(@DataInicio), dbo.ufninc_DataFimTrab(dbo.ufninc_CalcCreateDate(@DataInicio))) as real)/3600),2)
end
set @VarCalcCreateDate = dbo.ufninc_CalcCreateDate(@DataInicio)
while (1 = 1)
begin
if dbo.ufninc_DataAMeiaNoite(@VarCalcCreateDate) in (select dbo.ufninc_DataAMeiaNoite (EffectiveIntervalStart) from dbo.CalendarRuleBase where ExtentCode=2 and SubCode=5)
set @VarCalcCreateDate = dbo.ufninc_DataInicioTrab(@VarCalcCreateDate + 1)

if DATEPART(dw, @VarCalcCreateDate) = 6
set @VarCalcCreateDate = dbo.ufninc_DataInicioTrab(@VarCalcCreateDate + 3)
else
begin
if DATEPART(dw, @VarCalcCreateDate) = 1
set @VarCalcCreateDate = dbo.ufninc_DataInicioTrab(@VarCalcCreateDate + 2)
else
set @VarCalcCreateDate = dbo.ufninc_DataInicioTrab(@VarCalcCreateDate + 1)
end
if dbo.ufninc_DataAMeiaNoite(@VarCalcCreateDate) = dbo.ufninc_DataAMeiaNoite(dbo.ufninc_CalcGetDate(@DataFim ))
set @CalcHours = @CalcHours + (case
when
@VarCalcCreateDate = dbo.ufninc_DataAlmocoInicio(dbo.ufninc_CalcGetDate(@DataFim )) then
round(((cast(datediff(ss, @VarCalcCreateDate, dbo.ufninc_CalcGetDate(@DataFim )) as real)-5400)/3600),2)
else
round((cast(datediff(ss, @VarCalcCreateDate, dbo.ufninc_CalcGetDate(@DataFim)) as real)/3600),2)
end)
if dbo.ufninc_DataAMeiaNoite(@VarCalcCreateDate) = dbo.ufninc_DataAMeiaNoite(dbo.ufninc_CalcGetDate(@DataFim))
BREAK
else
set @CalcHours = @CalcHours + 8
end
end
return round(@CalcHours,2)
end

Post #438346

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