Calculate weekday (working day) between 2 dates.

Yes :

Add this to custom tags folder and see if it is what you were looking for

<!--- BusDateDiff.cfm
Description: This CF custom tag calculates the number of business days
between two dates.
Attributes:
START - (required) Start date.
END - (optional) End Date. Default is Now().

HOLIDAYS - (optional) Carriage-return-delimited variable with
list of business holidays.

FILE - (optional) Location of carriage-return-delimited text file with
list of business holidays. Attribute is valid if
ATTRIBUTES.HOLIDAYS does not exist.

NAME - (optional) Variable to save result in. If this attribute
exists, the result is stored in the variable.
Otherwise, the output is printed to the screen.

Example: <CF_BUSDATEDIFF
START="January 1, 1998"
END="December 31, 1998"
NAME="bus_days"
FILE="C:\InetPub\wwwroot\holidays.txt">

Notes: Like the Cold Fusion function DateDiff, CF_BusDateDiff excludes the
start date, yet includes the end date.

Copyright 1998, Troy D. Ely.
This tag is freeware and can thus be freely used, copied,
modified, and distributed as long as this header is left
intact. Please annotate any changes in the code before
modifying. If you experience any problems, or have any
suggestions, please contact me at tchaos@tampabay.rr.com

This tag is studio ready:

In order to use the BusDateDiff.vtm file, you also need to copy
the VTM file into a sub-directory of the Cold Fusion Studio
installation, which is typically:

\Program Files\Allaire\Cold Fusion Studio\Templates\TagEditors\

Last Modified: 02 September 1998
--->
<!--- Ditch excess space --->

<CFSETTING ENABLECFOUTPUTONLY="YES">

<!--- Default parameters --->

<CFPARAM NAME="ATTRIBUTES.START">
<CFPARAM NAME="ATTRIBUTES.END" Default=#Now()#>
<CFPARAM NAME="ATTRIBUTES.HOLIDAYS" DEFAULT="">
<CFPARAM NAME="ATTRIBUTES.FILE" DEFAULT="">

<!--- If bad start or end date, abort with message --->

<CFIF NOT IsDate(ATTRIBUTES.START)>
<CFOUTPUT>You entered an invalid start date.</CFOUTPUT>
<CFABORT>
</CFIF>

<CFIF NOT IsDate(ATTRIBUTES.END)>
<CFOUTPUT>You entered an invalid end date.</CFOUTPUT>
<CFABORT>
</CFIF>

<!--- Load holidays from file, if it exists --->

<CFIF ATTRIBUTES.FILE NEQ "">
<CFIF FileExists(ATTRIBUTES.FILE)>
<CFFILE ACTION="READ" FILE="#ATTRIBUTES.FILE#" VARIABLE="FileText">
<CFELSE>
<CFOUTPUT>The filename supplied to the CF_BusDateDiff tag (#ATTRIBUTES.File#) could not be found.</CFOUTPUT>
<CFABORT>
</CFIF>
<CFELSE>
<CFSET FileText="">
</CFIF>

<!--- Local variables for holiday query --->

<CFSET CR = Chr(13)&Chr(10)>
<CFSET num_holidays = 0>

<!--- count holidays --->

<CFLOOP LIST="#ATTRIBUTES.HOLIDAYS#" INDEX="RowText" DELIMITERS="#CR#">
<CFIF IsDate(RowText)>
<CFIF (DateCompare(ATTRIBUTES.START, Trim(RowText)) EQ -1) AND
(DateCompare(Trim(RowText), ATTRIBUTES.END) LE 0)>
<CFSET num_holidays = num_holidays + 1>
</CFIF>
</CFIF>
</CFLOOP>

<!--- Add holidays in the file to previously counted ones --->

<CFLOOP LIST="#FileText#" INDEX="RowText" DELIMITERS="#CR#">
<CFIF IsDate(RowText)>
<CFIF (DateCompare(ATTRIBUTES.START, Trim(RowText)) EQ -1) AND
(DateCompare(Trim(RowText), ATTRIBUTES.END) LE 0)>
<CFSET num_holidays = num_holidays + 1>
</CFIF>
</CFIF>
</CFLOOP>

<!--- Local variables for date computations --->

<CFSET start_day = DayOfWeek(ATTRIBUTES.START)>
<CFSET end_day = DayOfWeek(ATTRIBUTES.END)>
<CFSET date_diff_in_days = DateDiff("D", ATTRIBUTES.START, ATTRIBUTES.END)>
<CFSET whole_weeks = date_diff_in_days\7>
<CFSET days_left = date_diff_in_days MOD 7>

<!-- Subtract weekends in whole weeks --->

<CFSET non_bus_days = whole_weeks * 2>

<!--- Subtract partial or whole weekends for partial weeks --->

<CFIF days_left>
<CFIF end_day EQ 7 OR start_day EQ 7>
<CFSET non_bus_days = non_bus_days + 1>
<CFELSEIF start_day GT end_day>
<CFSET non_bus_days = non_bus_days + 2>
</CFIF>
</CFIF>

<!--- total business days --->

<CFSET bus_days = date_diff_in_days - non_bus_days - num_holidays>

<!--- Display output --->

<CFIF IsDefined("ATTRIBUTES.NAME")>
<CFSET "Caller.#ATTRIBUTES.NAME#" = bus_days>
<CFELSE>
<CFOUTPUT>#bus_days#</CFOUTPUT>
</CFIF>

<CFSETTING ENABLECFOUTPUTONLY="NO">