Through the 2008-09 season, that is 10-0 by the 1993-94 Toronto Maple Leafs and the 2006-07 Buffalo Sabres.
pre-seeson starts in mid-September and the regular season starts early in October
the nhl season usually starts in october and ends in April
The 2009-2010 NHL season officially started on October 8th, 2009.
October 7 for the regular season September 21 for the pre-season