WHY

@echo off
set  file=20
set "d=%time:~0,2%%time:~3,2%%time:~6,2%"
md %d: =0% 2>nul

for /f "delims=" %%a in ('dir /b /a-d g:\test\*') do (
    move "g:\test\%%a"  %d: =0%\
    set /a n+=1, "1/(n-file)" || exit
)
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