Windows console

Question

I would like to set the date in a Windows batch file to 7 days ago from today. I would like to do this in the following format.

Answer 1

There's an answer with calling powershell. Though there are still machines running without powershell installed (at the moment of writing this XP,Vista,Windows7,Windows2003 and Windows2008 still have a descent OS share and are coming without installed powershell)

Other option will be using jscript within a bat script

Here's the dayAdder.bat that accepts only one argument - the days you want to add to the current date and prints the result:

  @if (@X) == (@Y) @end /* JScript comment 
    @echo off   
    cscript //E:JScript //nologo "%~f0" %*
    exit /b %errorlevel%       
@if (@X)==(@Y) @end JScript comment */

var days=parseInt(WScript.Arguments.Item(0));


Date.prototype.addDays = function(days) {
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() + days);
    return date;
}

var date = new Date();

WScript.Echo(date.addDays(5));
WScript.Echo("Year: " + date.getFullYear());
WScript.Echo("Month: " + date.getMonth());
WScript.Echo("DayOfTeWEek: " + date.getDay());

usage and the output:

E:\scripts>call dayAdder.bat 7
Sun Nov 8 16:27:48 UTC+0200 2020
Year: 2020
Month: 10
DayOfTeWEek: 2
DayOfTheMonth: 3

You can modify it in way that will be suitable for you.