Add timestamp to photo using ImageMagick

In a Windows batch file:

    rem dptnt.com/2009/04/how-to-add-date-time-stamp-to-jpeg-photos-using-free-software/

    @ECHO OFF
    SETLOCAL
    FOR /R %%G IN (*.jpg) DO CALL :process "%%G"
    GOTO :end

    :process
     SET _inname=%1
     identify -format %%w %_inname% >dttmpfile
     set /p width=<dttmpfile
     Set /a pointsize=%width%/50
    rem  echo ZZ >> dttempfile
     DEL dttmpfile
     ECHO Processing %_inname% ...
     convert %_inname% -gravity SouthEast -font Arial -pointsize %pointsize% -fill orange -annotate +%pointsize%+%pointsize% "%%[exif:DateTimeOriginal]" %_inname%
     EXIT /B
    :end