mode COM3 BAUD=9600 PARITY=n DATA=8
@echo off
set X=
for /f "skip=1 delims=" %%x in ('wmic os get localdatetime') do if not defined X set X=%%x
set ldt= T
Call :SendToComPort
set ldt=%X:~8,2%
Call :SendToComPort
set ldt=%X:~10,2%
Call :SendToComPort
set ldt=%X:~12,2%
Call :SendToComPort
set ldt=%X:~6,2%
Call :SendToComPort
set ldt=%X:~4,2%
Call :SendToComPort
set ldt=%X:~2,2%
Call :SendToComPort
GOTO :END
:SendToComPort
set /p x=%ldt%<nul>\\.\COM3
GOTO :eof
:END