Batch Fix Datestamps After File Conversion

+*****************************************************************************************+
*******************************************************************************************
** THIS IS AN EPIC UBER MEGA BATCH FILE THAT EVEN TOOK CHATGPT MANY HOURS TO GET RIGHT.  **
** THIS IS A BATCH FILE TO COPY DATE/TIME STAMPS FROM ALL FILES OF A SPECIFIC TYPE IN    **
** ONE DIRECTORY TO ALL FILES OF THE SAME NAME, BUT DIFFERENT TYPE IN ANOTHER DIRECTORY. **
** IT IS TO BE USED AFTER BATCH CONVERSION OF FILES FROM ONE FORMAT TO ANOTHER WHERE     **
** YOU WANT TO RETAIN THE DATE/TIME STAMP OF THE ORIGINAL FILES. FOR EXAMPLE, YOU USED   **
** EITHER HANDBRAKE OR FFMPEG TO CONVERT A BUNCH OF STUFF, BUT NOW THOSE NEW FILES HAVE  **
** THE DATE/TIME OF THE CONVERSION RATHER THAN OF THE ORIGINAL RECORDING DATE. THIS      **
** FIXES THAT SITUATION.                       (C)OPYLEFT 2025 OGREVORBIS   DOSAIDSOFT   **
**                                                                                       **
** (note: like one out of every 20 files, it will get the time off by only like 1 hour)  **
** (prerequisite: nircmd - from Nir Sofer - nirsoft)                                     **
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+*****************************************************************************************+

@echo off
setlocal enabledelayedexpansion

if "%~1"=="" (
    echo Please provide the source directory as the first parameter.
    exit /b 1
)
if "%~2"=="" (
    echo Please provide the target directory as the second parameter.
    exit /b 1
)

set "SOURCE_DIR=%~1"
set "TARGET_DIR=%~2"

:: Loop through all MP4 files
for %%F in ("%SOURCE_DIR%\*.mp4") do (
    set "FILENAME=%%~nF"
    set "DEST_FILE=%TARGET_DIR%\!FILENAME!.ogg"

    if exist "!DEST_FILE!" (
        rem Extract full timestamp string from the source file
        for %%D in ("%%~fF") do set "STAMP=%%~tD"

        rem Split STAMP into date and time parts
        for /f "tokens=1,2,3" %%a in ("!STAMP!") do (
            set "DATE=%%a"
            set "TIME=%%b"
            set "AMPM=%%c"
        )

        rem Parse DATE - assume system format is MM/DD/YYYY
        for /f "tokens=1,2,3 delims=/" %%d in ("!DATE!") do (
            set "DD=%%d"
            set "MM=%%e"
            set "YYYY=%%f"
        )

        rem Parse TIME - separate hours and minutes
        for /f "tokens=1,2 delims=:" %%g in ("!TIME!") do (
            set "HOUR=%%g"
            set "MIN=%%h"
        )

        rem Adjust hour for AM/PM
        if "!AMPM!"=="PM" (
            if NOT "!HOUR!"=="12" (
                set /a HOUR=1!HOUR! - 100 + 12
            )
        ) else (
            if "!HOUR!"=="12" (
                set "HOUR=0"
            )
        )

        rem Assemble final timestamp string for NirCmd
        set "FINALSTAMP=!MM!-!DD!-!YYYY! !HOUR!:!MIN!:00"

        echo Setting timestamp on: !DEST_FILE! to !FINALSTAMP!
        nircmd.exe setfiletime "!DEST_FILE!" now "!FINALSTAMP!" ""
    ) else (
        echo Skipping: !DEST_FILE! (not found)
    )
)

echo Done.
pause