Question: when was the coach that led 2012 Stanford Cardinal football team born 

Context paragraphs:
David Shaw (American football): David Lorenzo Shaw (born July 31, 1972) is the head coach of the Stanford Cardinal football team.  Shaw was the team's offensive coordinator for the entire tenure of head coach Jim Harbaugh from 2007 to 2010.  Previously, Shaw was a four-year letter winner playing as a wide receiver for the Cardinal from 1991 to 1994, where he was coached by Dennis Green and Bill Walsh.  Prior to returning to Stanford as offensive coordinator, Shaw was Harbaugh's passing game coordinator at the University of San Diego and an assistant coach in the NFL for the Philadelphia Eagles, Oakland Raiders, and Baltimore Ravens.

1992 Stanford Cardinal football team: The 1992 Stanford Cardinal football team represented Stanford University in the 1992 NCAA Division I-A football season.  The Cardinal played in the Pacific-10 Conference and were coached by Bill Walsh.  Walsh served as Stanford's coach for two seasons (1977 and 1978) before leaving to coach the NFL's San Francisco 49ers to three Super Bowl championships.  He retired from coaching in 1989, worked briefly as a broadcaster, and then returned to coach Stanford to a #9 ranking and a Blockbuster Bowl victory.

2007 Stanford Cardinal football team: The 2007 Stanford Cardinal football team represented Stanford University in the 2007 NCAA Division I FBS football season.  In Jim Harbaugh's inaugural season at Stanford, the 41-point underdog Cardinal pulled off the greatest point-spread upset in college football history by defeating the #1 USC Trojans in a mid-season game (USC had been ranked No. 1 in all national pre-season polls, picked unanimously to win the Pac-10 Conference, and expected to contend for a national championship - until the Stanford upset).  To cap off Harbaugh's first season, the Cardinal defeated archrival Cal in Stanford's final game of the season to win the Stanford Axe for the first time in six years (aside from these two huge rivalry wins however the Cardinal went 2-8).

Notre Dame–Stanford football rivalry: The Notre Dame–Stanford football rivalry is an American college football rivalry between the Notre Dame Fighting Irish football team of the University of Notre Dame and Stanford Cardinal football team of Stanford University.  As of 2016, the Notre Dame Fighting Irish and Stanford Cardinal have met 31 times, beginning in 1925 (though the modern series began in 1988).  The Notre Dame–Stanford game has been played annually since 1997, with the teams meeting at Notre Dame Stadium earlier in the season (late September to mid-October) in even-numbered years, and at Stanford Stadium on the weekend following Thanksgiving in odd-numbered years since 1999.  The game typically alternates positions in Notre Dame's schedule with its other Pac-12 opponent, USC.

2009 Stanford Cardinal football team: The 2009 Stanford Cardinal football team represented Stanford University during the 2009 NCAA Division I FBS football season.  The Cardinal was led by third-year head coach Jim Harbaugh and played their home games at Stanford Stadium in Stanford, California.

2011 Stanford Cardinal football team: The 2011 Stanford Cardinal football team represented Stanford University in the 2011 NCAA Division I FBS college football season.  The Cardinal were led by former offensive coordinator and new head coach David Shaw, as Jim Harbaugh departed following the 2010 season in order to become the head coach of the San Francisco 49ers.  They played their home games at Stanford Stadium and are members of the North Division of the Pac-12 Conference.  They finished the season with 11–2 in overall record, 8–1 in Pac-12 play to finish in a tie with Oregon for first place in the North Division.  Due to their head-to-head loss to Oregon, they did not represent the division in the inaugural Pac-12 Football Championship Game.  They were invited the Fiesta Bowl, their second consecutive BCS game, where they were defeated by Oklahoma State 38–41 in overtime.

2006 Stanford Cardinal football team: The 2006 Stanford Cardinal football team represented Stanford University in the 2006 NCAA Division I FBS football season.  In head coach Walt Harris's second season at Stanford, the Cardinal won only one game, ending the season with a 1–11 record, the school's worst since a winless 1960 season.  Harris was fired on December 4, 2006, two days after Stanford's regular season ended.  By the end of his tenure at Stanford, Harris had surpassed Jack Curtice with the lowest winning percentage in the history of Stanford football, with a 26.1% win record.

2012 Stanford Cardinal football team: The 2012 Stanford Cardinal football team represented Stanford University in the 2012 NCAA Division I FBS football season.  The Cardinal were led by second-year head coach David Shaw.  They played their home games at Stanford Stadium and were members of the North Division of the Pac-12 Conference.

2008 Stanford Cardinal football team: The 2008 Stanford Cardinal football team represented Stanford University in the 2008 NCAA Division I FBS football season.  The team's head coach was Jim Harbaugh, who entered his second year at Stanford.  The team played their home games at Stanford Stadium in Stanford, California and competed in the Pacific-10 Conference.  The Cardinal improved on their a 4–8 record from the 2007 season by going 5–7.  After winning back the Stanford Axe from rival California in 2007 for the first time in five years, Stanford lost the Axe to Cal in the 2008 Big Game.

1997 Stanford Cardinal football team: The 1997 Stanford Cardinal football team represented Stanford University in the 1997 NCAA Division I-A football season.  They were led by head coach Tyrone Willingham.  The Cardinal participated as members of the Pacific-10 Conference and played their home games at Stanford Stadium in Stanford, California.

Supporting paragraphs: 2012 Stanford Cardinal football team David Shaw (American football)
Answer: July 31, 1972