programa time y date

@rem Original source: www.computerhope.com/issues/ch000987.htm
@rem Purpose: echo in Command Prompt the date and time in the following format:
@rem YYYYmmDD_hhMMss

@echo off

for /f "tokens=1-4 delims=/ " %%d in ("%date%") do set dateNow=%%e%%f%%g
for /f "tokens=1-3 delims=:." %%d in ("%time%") do set timeNow=%%d%%e%%f

echo %dateNow%_%timeNow%
pause