To set logfile current date time

for /F "tokens=2-4 delims=/ " %%i in ('date /t') do set tdtd=%%i%%j%%k
for /F "tokens=5-8 delims=:. " %%i in ('echo.^| time ^| find "current" ') do set ttrn=%%i%%j%%k%%l
set tufn=%tdtd%_%ttrn%

Then add this flag

--log_file=%tufn%.txt


Creator(s) should make it easier!!!