BATでファイル名に日付時刻を使いたい

echo %date:/=%_%TIME:~0,2%%TIME:~3,2%%TIME:~6,2%
https://p--q.blogspot.jp/2015/03/1.html

set time2=%time: =0%
http://tipstour.net/command/8253

set LOGFILENAME="C:\log\log_"
set TIME2=%TIME: =0%
set DATETIME=%date:/=%_%TIME2:~0,2%%TIME2:~3,2%%TIME2:~6,2%
ipconfig /all> %LOGFILENAME%_b%DATETIME%.log

http://www.atmarkit.co.jp/ait/articles/0405/01/news002.html