Original: 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.
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.