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SET G=%DATE:~0,2%
SET M=%DATE:~3,2%
SET Y=%DATE:~6,4%
FOR /F "tokens=1 delims=."  %%G IN ('TIME /T') DO SET HH=%%G
SET MM=%TIME:~3,2%
SET SS=%TIME:~6,2%
SET DD=%Y%%M%%G%
SET DD0=%Y%-%M%-%G%
SET DD1=%G%/%M%/%Y%
SET ORA=%HH%%MM%
SET ORA1=%HH%.%MM%.%SS%

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:sub_routine
SET start=%time%
SET shh=%start:~0,2%
SET smm=%start:~3,2%
SET sss=%start:~6,2%
SET sms=%start:~9,2%
SET DateTime2=%date% %shh%.%smm%.%sss%.%sms%
FOR /f "tokens=1-7 delims=/. " %%a in ("%Datetime2%") do (set "H=0%%d" &call set "DateTime3=%%c-%%b-%%a %%H:~-2%%:%%e:%%f.%%g")
FOR /f "tokens=1-7 delims=/. " %%a in ("%~t1") do (set "H=0%%d" &call set "FileDateTime=%%c-%%b-%%a %%H:~-2%%:%%e:00.00")

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:: timestamp YYYYMMDD_HHMMSS
@echo off
for /f "delims=" %%a in ('wmic OS Get localdatetime  ^| find "."') do set dt=%%a
set dt=%dt:~0,8%_%dt:~8,6%
echo %dt%
pause

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:: timestamp YYYY-MM-DD_HH-MM-SS
@echo off
for /f "delims=" %%a in ('wmic OS Get localdatetime  ^| find "."') do set dt=%%a
set dt=%dt:~0,4%-%dt:~4,2%-%dt:~6,2%_%dt:~8,2%-%dt:~10,2%-%dt:~12,2%
echo %dt%
pause

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@echo off &setlocal
for /f "delims=" %%i in ('dir /a-d /tc ^| findstr /b [0-9]') do (
   for /f "tokens=1-7*delims=/: " %%a in ("%%i") do (
      set "month=%%a"
      set "day=%%b"
      set "year=%%c"
      set "hour=%%d"
      set "min=%%e"
      set "AMPM=%%f"
      set "fname=%%h"
   )
   setlocal enabledelayedexpansion
   echo(!year!-!month!-!day! !hour!:!min! !AMPM! # !fname!
   endlocal
)

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:: file timestamp YYYYMMDD_HHMMSS
:: syntax: getfiledate.bat "c:\path\file.exe"
@echo off
set "file=%~1"
set "file=%file:\=\\%"
WMIC DATAFILE WHERE name="%file%" get lastmodified | find "." >file.tmp
for /f %%a in (file.tmp) do set dt=%%a
set dt=%dt:~0,8%_%dt:~8,6%
echo %dt%
del file.tmp
pause

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call timestamp.bat
call datetimefile.bat "C:\myfile.txt"
echo %dt% %dt1%

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:: timestamp YYYY-MM-DD_HH-MM-SS
@echo off
for /f "delims=" %%a in ('wmic OS Get localdatetime  ^| find "."') do set dt=%%a
set dt=%dt:~0,4%-%dt:~4,2%-%dt:~6,2%_%dt:~8,2%-%dt:~10,2%-%dt:~12,2%
goto :eof

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:: file timestamp YYYYMMDD_HHMMSS
:: syntax: getfiledate.bat "c:\path\file.exe"
@echo off
set "file=%~1"
set "file=%file:\=\\%"
WMIC DATAFILE WHERE name="%file%" get lastmodified | find "." >file.tmp
for /f %%a in (file.tmp) do set dt1=%%a
set dt1=%dt:~0,8%_%dt:~8,6%
del file.tmp
goto :eof

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@Echo Off

:dateinfo
::last modification: 22/11/2009
setlocal enableextensions
for /f "tokens=2,6,8 delims== " %%a in (
'^(echo.e100 B4 2A CD 21 CC^&echo.g^&echo.q^)^|debug^|find "AX="'
) do set "df=%%a%%b%%c"
set /a "d=0x%df:~10,2%,m=0x%df:~8,2%,y=0x%df:~4,4%,wd=%df:~2,2%"
echo.day=%d%
echo.month=%m%
echo.year=%y%
echo.weekday=%wd%
exit /b