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Tsql to calculate workdays - holidays: for current month


Tsql to calculate workdays - holidays: for current month

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David Smerchek
David Smerchek
Ten Centuries
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SELECT DATEDIFF (day, Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110), Convert(varchar(11),GETDATE(),110))
- (2 * DATEDIFF(week, Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110), Convert(varchar(11),GETDATE(),110)))
- CASE WHEN DATEPART(weekday, DATEADD(d,-(DAY(getdate())-1),getdate()) + @@DATEFIRST) = 1 THEN 1 ELSE 0 END - CASE WHEN DATEPART(weekday, GETDATE() + @@DATEFIRST) = 1 THEN 1 ELSE 0 END
-count(
Case
when '01/01/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110) then 1
when '7/4/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110)then 1
when '9/2/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110)then 1
when '11/28/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110)then 1
when '12/25/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110) then 1
end) as WorkDays
Sean Lange
Sean Lange
One Orange Chip
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Is there a question here or are you sharing something?

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Jeff Moden
Jeff Moden
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David Smerchek (6/19/2013)
SELECT DATEDIFF (day, Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110), Convert(varchar(11),GETDATE(),110))
- (2 * DATEDIFF(week, Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110), Convert(varchar(11),GETDATE(),110)))
- CASE WHEN DATEPART(weekday, DATEADD(d,-(DAY(getdate())-1),getdate()) + @@DATEFIRST) = 1 THEN 1 ELSE 0 END - CASE WHEN DATEPART(weekday, GETDATE() + @@DATEFIRST) = 1 THEN 1 ELSE 0 END
-count(
Case
when '01/01/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110) then 1
when '7/4/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110)then 1
when '9/2/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110)then 1
when '11/28/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110)then 1
when '12/25/2013' between Convert(Varchar(11),DATEADD(d,-(DAY(getdate())-1),getdate()),110) and Convert(varchar(11),GETDATE(),110) then 1
end) as WorkDays


The problem with such code is that it uses hardcoded dates that must be updated every year. If you forget, you can really mess up a whole bunch of things. Using a Calendar table would likely be a much better solution.

Whatever solution you use, at least add some error handling for when you run out of dates or have exceeded hardcoded expectations.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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