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NetWorkDays Expand / Collapse
Posted Wednesday, July 23, 2003 12:29 PM


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Last Login: Friday, January 28, 2005 9:50 AM
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Has any one created a function/stored procedure that will calculate NetWorkDays like the excel networkdays function?

From Excel Help file:


Returns the number of whole working days between start_date and end_date. Working days exclude weekends and any dates identified in holidays. Use NETWORKDAYS to calculate employee benefits that accrue based on the number of days worked during a specific term.

If this function is not available, run the Setup program to install the Analysis ToolPak. After you install the Analysis ToolPak, you must enable it by using the Add-Ins command on the Tools menu.




Start_date is a date that represents the start date. Dates may be entered as text strings within quotation marks (for example, "1/30/1998" or "1998/01/30"), as serial numbers (for example, 35825, which represents January 30, 1998, if you're using the 1900 date system), or as results of other formulas or functions (for example, DATEVALUE("1/30/1998")).

End_date is a date that represents the end date.

Holidays is an optional range of one or more dates to exclude from the working calendar, such as state and federal holidays and floating holidays. The list can be either a range of cells that contain the dates or an array constant of the serial numbers that represent the dates. Learn about array constants. For more information about how Microsoft Excel uses serial numbers for dates, see the Remarks section.

Post #14491
Posted Thursday, July 24, 2003 3:03 AM
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Though I'm sure there are plenty of other scripts out there check out this article

It contains several datetime related functions incl. one to calculate workdays.

Markus Bohse
Post #71856
Posted Friday, September 21, 2012 7:23 AM
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I trawled the net and found a version by Patrick Jasinski, who I must give the credit too.
It did't do exactly what I wanted in that it did not handle minus dates so I have altered it to allow for this.

To answer your question this worked for me.

CREATE function [dbo].[NetWorkDays](
@StartDate datetime
,@EndDate datetime
) returns int as begin

@result int
,@StartDate2 datetime
,@EndDate2 datetime
,@DateSwap1 datetime
,@DateSwap2 datetime
,@ReturnNegative BIT

set @DateSwap1 = @StartDate
set @Dateswap2 = @EndDate

SET @ReturnNegative = 0

IF @EndDate < @StartDate
SET @ReturnNegative = 1
SET @StartDate = @Dateswap2
SET @EndDate = @DateSwap1

set @StartDate2 = dateadd(d,8-datepart(dw, @StartDate), @StartDate)
set @EndDate2 = dateadd(d,1-datepart(dw ,@EndDate), @EndDate)

set @result = datediff(d, @StartDate2, @EndDate2) * 5 / 7
+ datediff(d, @StartDate, @StartDate2) - 1
+ datediff(d, @EndDate2, @EndDate)
- case when datepart(dw,@StartDate) = 1 then 1 else 0 end
- case when datepart(dw,@EndDate) = 7 then 1 else 0 end

if @ReturnNegative = 1
SET @result = @result * -1

return @result


Post #1362656
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