create batch file based on date in file name and move files

Question

I have a large number of excel files with filenames that all end in a timestamp that looks like this:

examplefile_2018_08_24_110222.xlsx

I would like to move all

Answer 1

I think this will do what you need it to do. I added some comments so please let me know if you do not understand a line of the code.

@ECHO OFF

REM get a list of the files
FOR %%F IN (*.xlsx) DO (
    REM GET 2nd, 3rd and 4th parts of file name: examplefile_2018_08_24_110222.xlsx
    FOR /F "tokens=2,3,4 delims=_" %%G IN ("%%~F") DO (
        REM GET previous month and/or year
        FOR /F "delims=" %%J IN ('powershell "(Get-Date %%H/%%I/%%G).AddMonths(-1).ToString('MMMMyyyy')"') DO (
            REM make the directory
            md "%%J" >nul 2>&1
            REM move the file
            move "%%~F" "%%J\"
        )
    )
)