Business Days calculation

Question

I have a query where I am calculating total days between two days including start and end date by the following SQL query. If the end date is not null, then end date is cons

Answer 1

I would strongly recommend a calendar table for this, especially if you need to take specific holidays into account. Calculating Easter dynamically, for example, is going to be a royal pain.

http://web.archive.org/web/20070611150639/http://sqlserver2000.databases.aspfaq.com/why-should-i-consider-using-an-auxiliary-calendar-table.html

If you're going to use T-SQL alone, be careful about using functions that rely on regional/language settings for the output of things like DATENAME ...

Answer 2

Take a look at the DATEDIFF MSDN page. At the bottom of the page, there is some user-generated content.
One user posted a function there which does exactly what you want, including holidays (headline: "UDF to return the number of business days, including a check to a bank holidays table").

Answer 3

try this

SELECT  DateDiff(day,DateADD(day,-1,StartDate),ISNULL(EndDate,getDate())) - 
( CASE WHEN DATENAME(dw, StartDate) = 'Sunday' OR 
DATENAME(dw,ISNULL(EndDate,getDate())) = 'Sunday' THEN 1 ELSE 0 END)
- ( CASE WHEN DATENAME(dw, StartDate) = 'Saturday' OR 
     DATENAME(dw,ISNULL(EndDate,getDate())) = 'Saturday' THEN 1 ELSE 0 END)
numberOfDays         
FROM <mytable>