Calculate business days using a batch file - date

Question

I have a very simple batch file I am trying to write.
If today is 03/13, I would like my batch file to output:
"I will call you back on 03/15"
So it will take the date and ADD 2 business days. So if it were 03/15:
"I will call you back on 03/19"

Answer 1

Eh, do not worry, it can be done in batch. :) Here is an implementation of mine (~150 lines of code).
Example
https://gist.github.com/DavidRuhmann/4666270
Usage
Do something like this to adjust for the weekends.
if "%Date:~0,3%"=="Thu" call :DaysAhead 4
if "%Date:~0,3%"=="Fri" call :DaysAhead 4
if "%Date:~0,3%"=="Sat" call :DaysAhead 3
if "%Date:~0,3%"=="Sun" call :DaysAhead 2
if "%Date:~0,3%"=="Mon" call :DaysAhead 2
if "%Date:~0,3%"=="Tue" call :DaysAhead 2
if "%Date:~0,3%"=="Wed" call :DaysAhead 2

Answer 2

Use JScript to calculate the date and you're golden.
#if (#X)==(#Y) #end /* (batch + jscript hybrid script init)
:: *** Batch script *****
#echo off
setlocal
for /f %%I in ('cscript /nologo /e:jscript "%~f0"') do (
echo I will call you back on %%I
)
goto :EOF
:: *** JScript script *****/
var dow = new Date().getDay();
var days = (dow > 4) ? 9 - dow : (dow == 4 ? 4 : 2);
var d = new Date(new Date().getTime() + (1000 * 60 * 60 * 24) * days);
WScript.echo((d.getMonth() + 1) + '/' + d.getDate());
If today is Thursday, the script will return the following Monday. Friday through Sunday, the following Tuesday. Monday through Wednesday, two days ahead. And you don't have to worry about locale, leap year, leap frogs, lunar cycles, etc.

Answer 3

The Batch file below do what you want:
#echo off
rem AddBusinessDays.bat date numOfDays
rem Antonio Perez Ayala
rem Convert the date to Julian Day Number + number of days
for /F "tokens=1-3 delims=/" %%a in ("%1") do (
set /A mm=10%%a %% 100, dd=10%%b %% 100, yy=%%c
)
set /A a=mm-14, jd=(1461*(yy+4800+a/12))/4+(367*(mm-2-12*(a/12)))/12-(3*((yy+4900+a/12)/100))/4+dd-32075+2+%2, dow=jd%%7
rem Adjust Julian Day Number to avoid weekends
if %dow% lss 2 set /A jd+=2-dow
rem Convert Julian Day Number back to date
set /A l=jd+68569-2,n=(4*l)/146097,l=l-(146097*n+3)/4,i=(4000*(l+1))/1461001,l=l-(1461*i)/4+31,j=(80*l)/2447,dd=l-(2447*j)/80,l=j/11,mm=j+2-(12*l),yy=100*(n-49)+i+l
rem Assemble the result
if %dd% lss 10 set dd=0%dd%
if %mm% lss 10 set mm=0%mm%
set newDate=%mm%/%dd%/%yy%
echo %newDate%
Reference: http://www.hermetic.ch/cal_stud/jdn.htm#comp
For example:
>echo %date%
03/13/2013
>AddBusinessDays.bat %date% 2
03/15/2013
>AddBusinessDays.bat %date% 3
03/18/2013
>AddBusinessDays.bat %date% 4
03/18/2013
>AddBusinessDays.bat %date% 5
03/18/2013
>AddBusinessDays.bat %date% 6
03/19/2013
Antonio
PS - Yes, I know that this method will not work for everyone in the world. The good news are that I not wrote this solution for they all, but precisely for the OP although it is very easy to modify it for every computer. For example, previous program does NOT work in my computer because my locale is DD/MM/YYYY, but I can interchange dd and mm in two lines of previous program and I am pretty sure that most people in this world are also capable to do so! ;-)
Hi Antonio,
Just today I found that the code you shared didn't work for more than 7 days ahead, I changed some thing and now it works ever.
#echo off
rem AddBusinessDays.bat date numOfDays
rem adapted by Leonardo Contreras based on Antonio Perez Ayala with handling for more than 7 days
rem to convert Dow mm/dd/yyyy to mm/dd/yy
set mydate=%date:~4,2%/%date:~7,2%/%date:~10,4%
rem Convert the date to Julian Day Number + number of days
for /F "tokens=1-3 delims=/" %%a in ("%mydate%") do (
set /A mm=10%%a %% 100, dd=10%%b %% 100, yy=%%c
)
rem dow_orig is based on a 0-6 days statrting on Monday
set /A a=mm-14, jd_orig = (1461*(yy+4800+a/12))/4+(367*(mm-2-12*(a/12)))/12-(3*((yy+4900+a/12)/100))/4+dd-32075, dow_orig=jd_orig%%7
rem calculate new julian's day
set /A numw = (dow_orig+%3)/5, njd = jd_orig+%3+numw*2, dow=(njd)%%7
rem Adjust Julian Day Number to avoid weekends
if %dow% gtr 5 (set /A jd+=2 )
rem Convert Julian Day Number back to date
set /A l=njd+68569,n=(4*l)/146097,l=l-(146097*n+3)/4,i=(4000*(l+1))/1461001,l=l-(1461*i)/4+31,j=(80*l)/2447,dd=l-(2447*j)/80,l=j/11,mm=j+2-(12*l),yy=100*(n-49)+i+l
rem Assemble the result
if %dd% lss 10 set dd=0%dd%
if %mm% lss 10 set mm=0%mm%
set newDate=%mm%/%dd%/%yy%
echo %newDate%