Original: The negotiating teams reached an agreement on July 13, 2005, and the lockout officially ended nine days later on July 22, after both the NHL owners and players ratified the CBA.
Simplified: The lockout lasted 310 days starting September 16 2004, the day after the collective bargaining agreement (CBA) between the NHL and the NHL Players Association (NHLPA) that resolved the 1994 - 95 lockout expired.