 
 <translate> The NHL Collective Bargaining Agreement (CBA) is the basic contract between the National Hockey League (NHL) team owners and the NHL Players' Association (NHLPA), designed to be arrived at through the typical labour-management negotiations of collective bargaining. The most recent agreement, tentatively reached on January 6, 2013 after a labour dispute which cancelled 510 regular season games of the 2012 -- 13 season, was ratified by the league's Board of Governors on January 9, 2013, as well as by the NHLPA membership three days later on January 12, 2013. The current CBA is a 10-year deal, the longest in NHL history, expiring after the 2021 -- 22 season.

Answer this question based on the passage: when does the nhl collective bargaining agreement expires? OK. Let's think. My stream of consciousness: <ibo> Nkwekọrịta mkpokọta mkpokọta NHL (CBA) bụ nkwekọrịta nkwekọrịta dị n'etiti ndị nwe National Hockey League (NHL) na NHL Players 'Association (NHLPA), nke e mere iji rute site na mkparịta ụka ndị ọrụ-njikwa nke mkpokọta mkpokọta. Nkwekọrịta kachasị ọhụrụ, nke e mere na Jenụwarị 6, 2013 mgbe esemokwu ọrụ nke kagbuchara egwuregwu oge 510 nke 2012 - 13 oge, ka ndị otu gọọmentị gọọmentị kwadoro na Jenụwarị 9, 2013, yana ndị otu NHLPA ụbọchị atọ ka e mesịrị na Jenụwarị 12, 2013. Nkwekọrịta CBA nke ugbua bụ nkwekọrịta afọ iri, nke kachasị ogologo n'akụkọ ihe mere eme nke NHL, na-agwụ mgbe oge 2021 - 22 gasịrị.  Zaa ajụjụ a dabere n'amaokwu a: olee mgbe nkwekọrịta mkpokọta NHL na-agwụ? Ọ dị mma. Ka anyị chee echiche. Ihe m na-echeta: 