Title: 2018–19 Boston Bruins season
Content:  The 2018–19 Boston Bruins season was the 95th season for the National Hockey League franchise that was established on November 1, 1924. The Bruins clinched a playoff spot on March 23, 2019, after a 7–3 win over the Florida Panthers. On May 16, 2019, the Bruins advanced to the 2019 Stanley Cup Finals with a 4–0 victory over the Carolina Hurricanes, marking their first Stanley Cup Finals appearance since 2013. They would lose in seven games to the St. Louis Blues.
Title: 1973–74 Boston Bruins season
Content:  The 1973–74 Boston Bruins season was the Bruins' 50th season in the NHL. They made it back to the Stanley Cup finals, but lost to the Philadelphia Flyers in six games.
Title: 2019 Stanley Cup Finals
Content:  This was the Boston Bruins' twentieth appearance in the Stanley Cup Finals, six years after, when they faced the Chicago Blackhawks and were defeated in six games. The Bruins last won the Stanley Cup in against the Vancouver Canucks in seven games, their sixth Cup in franchise history. Brad Marchand became the first Bruin since the 2005–06 season to score 100 points, finishing the regular season with 100 points in 79 games. David Pastrnak led the team in goals with 38. Tuukka Rask and Jaroslav Halak split the goaltending duties during the regular season. Halak had signed with the team during the off-season, and approaching the trade deadline the Bruins acquired forwards Charlie Coyle and Marcus Johansson. Boston finished the regular season with 107 points, finishing in second place in the Atlantic Division and third overall in the league. In the First Round of the playoffs, they defeated the Toronto Maple Leafs in seven games for the second consecutive playoff meeting against the Maple Leafs and third since the 2012–13 season. They then defeated the Columbus Blue Jackets 4–2 in the Second Round. In the Conference Finals, Boston swept the Carolina Hurricanes 4–0.
Title: 2011–12 Boston Bruins season
Content:  The Boston Bruins qualified for the Stanley Cup playoffs for the fifth consecutive season. The Bruins lost in the first round to the Washington Capitals in a seven-game series 4–3.
Title: 2011 Stanley Cup Finals
Content:  also play in the 2013 Stanley Cup Finals, so from 2004 to 2015 all four Boston major league teams have each reached the championship rounds at least twice and also won at least once during a decade from 2001 to 2011. Following the 2011 Stanley Cup Finals, Boston Globe columnist Dan Shaughnessy ranked all seven championships during the decade and ranked the Bruins' 2011 Stanley Cup triumph as third, behind only the Patriots winning Super Bowl XXXVI (second) and the Red Sox winning the 2004 World Series (first). The Bruins won their sixth Cup championship, and their first one since defeating the New York Rangers in in six games, which makes Boston the first city to have championships in each of the four leagues in the new millennium.
Title: List of Boston Bruins seasons
Content:   The Boston Bruins are a professional ice hockey team based in Boston, Massachusetts. They are members of the Atlantic Division in the Eastern Conference of the National Hockey League (NHL) and are one of the Original Six teams of the league. Founded in 1924, it is the league's third-oldest team and is the oldest in the United States, with the 2020–21 season marking the 97th year for the franchise. As of the end of their 2020–21 season, the Bruins have won 3,241 regular season games, accumulated 26 division championships and five conference championships, led the league in points fourteen times, appeared in the playoffs 74 times, and won six Stanley Cup titles.
Title: 2010–11 Boston Bruins season
Content:  The 2010–11 Boston Bruins season was the Bruins' 87th season in the National Hockey League (NHL). The Bruins were the winners of the 2011 Stanley Cup, winning their first Stanley Cup in 39 years.
Title: 2019 Stanley Cup playoffs
Content:  This was the third playoff meeting between these two teams, with Boston winning both previous series. They last met in the 1972 Stanley Cup Semifinals which Boston won in a four-game sweep. St. Louis made their fourth appearance in the Finals. They last advanced to the Finals in 1970, which they lost in four games to the Boston Bruins. Boston made their twentieth Finals appearance. They last advanced to the Finals in 2013, which they lost in six games to the Chicago Blackhawks. These teams split the two games in this year's regular season series.
Title: 1969–70 Boston Bruins season
Content:  the Stanley Cup Finals for the first time since 1958. Boston Bruins vs. St. Louis Blues Boston faced the winner of the Western Division, the St. Louis Blues, making its 3rd straight Stanley Cup final appearance. The Blues had been swept by the Montreal Canadiens in both their previous appearances in the Finals. St. Louis defeated the Minnesota North Stars and Pittsburgh Penguins to reach the Finals. The series opened at the St. Louis Arena, and the Bruins had no problems at all in their first two games, defeating the Blues by scores of 6–1 and 6–2 to take a 2–0 series lead. The series shifted to Boston for the next 
Title: 2014–15 Boston Bruins season
Content:  The 2014–15 Boston Bruins season was their 91st season in the National Hockey League (NHL). Despite earning 96 points, the Bruins did not qualify for the 2015 Stanley Cup playoffs, ending their seven-season playoff streak. At the time, this was the most points ever by a team who did not qualify, surpassing the 95 points earned by the 2006–07 Colorado Avalanche and the 2010–11 Dallas Stars. The Bruins held this record for three seasons, until the 2017–18 Florida Panthers tied their record. The Montreal Canadiens achieved the same thing the next season.

Question: when was the last time the boston bruins went to the stanley cup?
Answer: 2011 Stanley Cup Finals.