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03.20.2008 at 05:46AM PDT, ID: 23256650
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7.6

How to set a batch file date variable to one month ago?

Asked by sasllc in Windows Batch Scripting, Windows XP Operating System

I recently got help on e-e on how to set a variable to approx. one year ago, so I can use it in the xcopy command, as follows:

@echo off
setlocal
set /a iLY=%date:~-1,1% - 1
set LastYear=%date:~4,-1%%iLY%
set LastYearMod=%LastYear:~0,3%01%LastYear:~5%
xcopy f:\*.dat c:\hold\*.dat /s /v /d:%LastYearMod%

This routine sets %LastYearMod% to one year ago, except it always sets the day to "01" so we don't have to worry about leap years.

Now I need to know if there is a relatively simply way to just look back approx. one MONTH.  It's fine with me to always make the day "01", meaning that my variable (maybe calling it %LastMonthMod%) would equal 02/01/2007 based on today's date, for example.  But the primary problem I don't know how to handle is the situation where we are in January, meaning it has to go "back" to a month of 12, and the year has be reduced by 1.  In other words, 12/15/08 will create a value of 11/01/08, but 01/15/09 will need to create a value of 12/01/08.  Can this be done?  TIAStart Free Trial
 
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[+][-]03.20.2008 at 05:57AM PDT, ID: 21170778

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[+][-]03.20.2008 at 06:28AM PDT, ID: 21171131

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[+][-]03.20.2008 at 09:23AM PDT, ID: 21173069

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[+][-]03.20.2008 at 10:12AM PDT, ID: 21173464

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About this solution

Zones: Windows Batch Scripting, Windows XP Operating System
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Solution Provided By: sungenwang
Participating Experts: 2
Solution Grade: A
 
 
 
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