Question: The 2012–13 season is the 109th season in Real Madrid Club de Fútbol's history and their 82nd consecutive season in La Liga, Real Madrid began the season by defeating Barcelona on away goals, by winning the 2012 Supercopa de España was a two-legged Spanish football match-up that took place on which dates, between the champions of 2011–12 La Liga, Real Madrid, and the winner of the 2011–12 Copa del Rey, Barcelona?

Context paragraphs:
List of Real Madrid C.F. seasons: Real Madrid Club de Fútbol is a team who compete in La Liga.  The club was formed in 1902 as Madrid Football Club, and played its first competitive match on 13 May 1902, when it lost 3–1 in the semi-final of the Campeonato de Copa de S.M. Alfonso XIII against FC Barcelona.  Real Madrid played against other local clubs in various regional tournaments disputed from 1902 to 1940.  However, in 1929 the club became one of the founding members of La Liga, Spain's first national league.  As of 2014, Real is one of only five clubs never to have been relegated from the top level of Spanish football, the others being Athletic Bilbao, FC Barcelona, Getafe and S.D. Eibar

2001 Supercopa de España: The 2001 Supercopa de España was two-leg Spanish football matches played on 19 August and 22 August 2001.  It was contested by Zaragoza, who were Copa del Rey winners in 2000–01, and Real Madrid, who won the 2000–01 La Liga title.  Real Madrid won the Supercopa de España 4–1 on aggregate.

2011 Supercopa de España: The 2011 Supercopa de España was a two-legged Spanish football match-up that was played on 14 and 17 August 2011.  It was contested by Real Madrid, the 2010–11 Copa del Rey winners, and Barcelona, the 2010–11 La Liga winners.

2016 Supercopa de España: The 2016 Supercopa de España was a two-legged football match-up played in August 2016 between the champions of 2015–16 La Liga and 2015–16 Copa del Rey, Barcelona, and the runners-up of the 2015–16 Copa del Rey, Sevilla.

2014 Supercopa de España: The 2014 Supercopa de España was a two-legged football match-up played in August 2014 between the champions of 2013–14 La Liga, Atlético Madrid, and the winner of the 2013–14 Copa del Rey, Real Madrid.  The first leg ended 1–1.  Atlético won the trophy after beating Real Madrid 1–0 in second leg.  This was the first time that the Supercopa de España was a Madrid derby, and also the first time since 2008 that the competition did not feature Barcelona team.

2015 Supercopa de España: The 2015 Supercopa de España was a two-legged football match-up that was played in August 2015 between Athletic Bilbao, runners-up of the 2014–15 Copa del Rey, and Barcelona, the champions of 2014–15 La Liga and the 2014–15 Copa del Rey.  It was also a repetition of the 2015 Copa del Rey Final.

2011–12 Real Madrid C.F. season: The 2011–12 season is the 108th season in Real Madrid Club de Fútbol's history and their 81st consecutive season in La Liga, the top division of Spanish football.  It covers a period from 1 July 2011 to 30 June 2012.  Real Madrid began the season finishing runners-up in the Supercopa de España to Barcelona, losing 5–4 on aggregate.

2013 Supercopa de España: The 2013 Supercopa de España was a two-legged Spanish football match-up that was played in August 2013 between the champions of 2012–13 La Liga, Barcelona, and the winner of the 2012–13 Copa del Rey, Atlético Madrid.

2012 Supercopa de España: The 2012 Supercopa de España was a two-legged Spanish football match-up that took place on 23 and 29 August 2012 between the champions of 2011–12 La Liga, Real Madrid, and the winner of the 2011–12 Copa del Rey, Barcelona.

2012–13 Real Madrid C.F. season: The 2012–13 season is the 109th season in Real Madrid Club de Fútbol's history and their 82nd consecutive season in La Liga, the top division of Spanish football.  It covers a period from 1 July 2012 to 30 June 2013.  Real Madrid began the season by winning the Supercopa de España, defeating Barcelona on away goals.

Supporting paragraphs: 2012–13 Real Madrid C.F. season 2012 Supercopa de España
Answer: 23 and 29 August 2012