When is the last time the cowboys won a superbowl?
No context provided
When is the last time the cowboys won a superbowl in 1996?
January 28, 1996
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When is the last time the cowboys won a superbowl in 1994?
January 30, 1994
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When is the last time the cowboys won a superbowl in 1993?
January 31, 1993
List of Super Bowl champions
https://en.wikipedia.org/wiki/List%20of%20Super%20Bowl%20champions
Dallas Cowboys
https://en.wikipedia.org/wiki/Dallas%20Cowboys
The Dallas Cowboys are a professional American football team based in the Dallas–Fort Worth metroplex. The Cowboys compete in the National Football League (NFL) as a member club of the league's National Football Conference (NFC) East division. 
Dallas Cowboys
The Cowboys defeated the Bills by the score of 52–17, winning their third Super Bowl in team history, and their first one in 15 years. This game is tied with Super Bowl XXXVII as the third-highest scoring Super Bowl with 69 combined points.[5] The Bills became the first team to lose three consecutive Super Bowls, and just the second team to play in three straight (the Miami Dolphins played in Super Bowls VI–VIII, winning VII and VIII). The game was played on January 31, 1993 at the Rose Bowl in Pasadena, California, and is the last NFL championship game to date to be held in a non-NFL stadium.
Dallas Cowboys
Super Bowl XXVIII was an American football game between the National Football Conference (NFC) champion Dallas Cowboys and the American Football Conference (AFC) champion Buffalo Bills to decide the National Football League (NFL) champion for the 1993 season. The Cowboys defeated the Bills for the second straight year by the score of 30–13, winning their fourth Super Bowl in team history, tying the Pittsburgh Steelers and the San Francisco 49ers for most Super Bowl wins. The game was played on January 30, 1994, at the Georgia Dome in Atlanta, Georgia.
Super Bowl XXVIII
Super Bowl XXX was an American football game between the National Football Conference (NFC) champion Dallas Cowboys and the American Football Conference (AFC) champion Pittsburgh Steelers to decide the National Football League (NFL) champion for the 1995 season. The Cowboys defeated the Steelers by the score of 27–17.[5] The game was played on January 28, 1996, at Sun Devil Stadium in Tempe, Arizona, the first time the Super Bowl was played in the Phoenix metropolitan area.
Super Bowl XXX
The Dallas Cowboys are a professional American football team based in the Dallas–Fort Worth metroplex, who compete in the National Football League as a member club of the league's National Football Conference East division. The Cowboys won their third Super Bowl in team history and their first in fifteen years on January 31, 1993, after they defeated the Bills by the score of 52–17 at the Rose Bowl in Pasadena, California, which is the last NFL championship game to date to be held in a non-NFL stadium. The following year, on January 30, 1994, the Cowboys defeated the Bills in the Super Bowl once again, with a score of 30–13, at the Georgia Dome in Atlanta, Georgia. Two years later, on January 28, 1996, the Cowboys defeated the Steelers in the Super Bowl XXX game by the score of 27–17 at Sun Devil Stadium in Tempe, Arizona, which the first time the Super Bowl was played in the Phoenix metropolitan area.