SET thedate=%date%
REM only take the last 4, then start at #4, take 2, then start at 7, take 2
SET theyear=%thedate:~-4%
SET themonth=%thedate:~4,2%
SET theday=%thedate:~7,2%
SET hyphen=-
SET filedate=%theyear%%hyphen%%themonth%%hyphen%%theday%
SET thetime=%time%
SET thehour=%thetime:~0,2%
SET theminute=%thetime:~3,2%
SET underscore=_
SET timestamp=%filedate%%underscore%%thehour%%hyphen%%theminute%
msiexec /I "c:\Client_Installer_64bit\" /qb /Lv* c:\%timestamp%-install.log ALLUSERS=1