'The NHL went to the current standings format when introducing the shootout for the 2005-06 season. Any defeat in overtime or in the shootout goes in the third category called "overtime." So it's win, loss or overtime. What no longer exists in the NHL is an undefeated streak. Only winning streaks, losing streaks, or winless streaks.'
Confusion over Buffalo Sabres slump: it's not a losing streak
Source: CP