Title: 2012 Stanley Cup playoffs
Content:  This was the third playoff series between these two teams, with St. Louis having swept Los Angeles out of both of the previous playoff series; the most recent matchup was in the 1998 Western Conference Quarterfinals. Los Angeles won three of the games in this year's four-game regular season series. The Kings swept the Blues to advance to their first conference finals since 1993. Los Angeles scored 15 total goals in the series, while goaltender Jonathan Quick only allowed six total St. Louis goals. This series marked the first time in Kings history that they swept a seven-game series, and the first time in NHL history the eighth seed defeated both the first and the second seeds. This was the only sweep of the entire playoffs.
Title: History of the Los Angeles Kings
Content:  and frequent road losses. A defeat to the Calgary Flames in the penultimate game of the season eliminated the Kings from playoff contention, while qualifying Calgary, which coincidentally missed the post-season during the Kings' five-season playoff streak. Despite finishing with a record of 40–27–15, the Kings became the first defending Stanley Cup champion to miss the post-season since the 2006–07 Carolina Hurricanes and only the fourth overall since the 1967 NHL expansion season. At the start of the 2015–16 season. The Kings were expected to make the playoffs. They entered the playoffs as the fifth seeded in their conference and second seeded in their division. They faced 
Title: 2012 Stanley Cup Finals
Content:  The Los Angeles Kings historically have not fared well in the postseason, having only progressed beyond second round of the playoffs once in franchise history. There were some highlights in franchise history, such as a dramatic seven-game series loss to the heavily favored Boston Bruins in 1976, the upset of the top seeded Edmonton Oilers (including the game three Miracle on Manchester) in 1982, and a comeback from a 3–1 series deficit to beat the defending Stanley Cup champion Oilers in 1989. The first time that they advanced to the Conference Finals was in, where the Kings defeated the Toronto Maple Leafs to reach 
Title: History of the Los Angeles Kings
Content:  won the Stanley Cup in five games, culminating with an Alec Martinez goal in the second overtime of Game 5 at Staples Center. The championship run had a record 26 playoff games, with the Kings facing elimination a record seven times. With their Game 7 victory in the Conference Finals and wins in the first two games of the Cup Finals, they became the first team to win three consecutive playoff games after trailing by more than one goal in each game. Justin Williams, who scored twice in the Finals and had points in all three Game 7s throughout the playoffs, won the Conn Smythe Trophy as playoff MVP.
Title: History of the Los Angeles Kings
Content:  Kings also became the first NHL team to enter the playoffs as the eighth seed and eliminate the first- and second-seeded teams in the Conference. They then defeated Phoenix in five games to reach the Finals, culminating in an overtime goal by Dustin Penner in Game 5, and thus becoming the second team in NHL history to beat the top three Conference seeds in the playoffs (the Calgary Flames achieved the same feat in 2004, ironically also under Darryl Sutter) and the first eighth seed to accomplish the feat. Los Angeles faced the New Jersey Devils in the Final, defeating them in six games to win their first Stanley Cup in franchise history. With 
Title: History of the Los Angeles Kings
Content:  Having won two Stanley Cup championships in the last three years, the Kings entered the 2014–15 season as the early favorites to retain their title. Again, however, Los Angeles' post-championship home opener was a defeat, this time a 4–0 blowout to cross-state rival San Jose Sharks. The following game was an overtime defeat to the Arizona Coyotes, followed by a home win against the Winnipeg Jets. During the season, the Kings took part in their second outdoor game, this time visiting the Sharks at Levi's Stadium for the 2015 NHL Stadium Series The Kings struggled often during the season, with scoring slumps, defensemen losing games to injury and 
Title: 2011–12 Los Angeles Kings season
Content:  The Kings made the playoffs for the third consecutive season, needing a win in the final game to secure the eighth seed. The Kings also became the second team to eliminate the first, second and third seeds from the playoffs in the same post-season (after the 2003–04 Calgary Flames), as well as the only team to win the Stanley Cup after defeating the first, second and third seeds in sequence. (Darryl Sutter was the head coach of both the 2003–04 Flames and 2011–12 Kings.) They then defeated the New Jersey Devils in the Stanley Cup Finals, becoming the first eighth seed in North American professional sports history to win a championship. They are also one of the few teams to win a championship after never benefiting from home-venue advantage in the post-season after the 1994-95 New Jersey Devils. Los Angeles would start every series by winning the first three games, only sweeping the St. Louis Blues.
Title: Los Angeles Kings
Content:  Having won two Stanley Cup championships in the last three years, the Kings entered the 2014–15 season as the early favorites to retain their title. However, the Kings struggled often, with scoring slumps, defensemen losing games to injury and suspensions and frequent road losses. A defeat to the Calgary Flames in the penultimate game of the season eliminated the Kings from playoff contention, while qualifying Calgary, which coincidentally missed the postseason during the Kings' five-season playoff streak. Despite finishing with a record of 40–27–15, the Kings became the first defending Stanley Cup champion to miss the postseason since the 2006–07 Carolina Hurricanes and only the fourth overall since the 1967 NHL expansion season. At 
Title: History of the Los Angeles Kings
Content:  a five-game winning streak gave the Phoenix Coyotes their first Pacific Division championship. The Kings settled for the eighth seed, having rounded out the season with a 40–27–15 record for 95 points. The Kings then headed into the 2012 playoffs against the Presidents' Trophy-winning Vancouver Canucks. After playing two games in Vancouver and one in Los Angeles, the Kings were up 3–0 in the series, a franchise first. By winning Game 5 in Vancouver, the Kings advanced to the Conference Semifinals for the first time since the 2000–01 season, whereupon they swept the second-seeded St. Louis Blues, advancing to the Western Conference Finals for only the second time in franchise history. In doing so, 
Title: 2013 Stanley Cup playoffs
Content:  This was the second playoff series for these two teams. Their only previous meeting was in the 1974 Stanley Cup Quarterfinals, which Chicago won in five games. The Blackhawks won two of the three games in the regular season series. The Chicago Blackhawks made it to their third Conference Finals since 2009, while the Los Angeles Kings were making their second straight appearance. The Blackhawks defeated the Kings in five games by extending Los Angeles' road playoff losing streak to six, and they gave the Kings their first home playoff loss in game four. Patrick Sharp and Marian Hossa scored back-to-back goals in their 2–1 victory in game one, Four different Chicago 

Question: when was the last time the la kings won a playoff series?
Answer: 2012 Stanley Cup Finals.