Question: in 2014-15 Sevilla competed in a league that began on which day ?

Context paragraphs:
2014 UEFA Europa League Final: The 2014 UEFA Europa League Final was the final match of the 2013–14 UEFA Europa League, the 43rd season of Europe's secondary club football tournament organised by UEFA, and the fifth season since it was renamed from the UEFA Cup to the UEFA Europa League.  It was played at the Juventus Stadium in Turin, Italy on 14 May 2014, between Spanish side Sevilla and Portuguese side Benfica.  Sevilla won the match 4–2 on penalties, following a 0–0 draw after extra time.

2016 Supercopa Euroamericana: The 2016 Supercopa Euroamericana was the second edition of Supercopa Euroamericana, a men's football friendly tournament created by DirecTV, disputed between the Copa Sudamericana and the UEFA Europa League winners.  The match was played in 2016 by Santa Fe, the 2015 Copa Sudamericana champions, and Sevilla, the 2014–15 UEFA Europa League champions.  The match took place on July 24 at the ESPN Wide World of Sports Complex in Bay Lake, Florida.  Sevilla won the match 2–1.

2014–15 La Liga: The 2014–15 La Liga season (known as the "Liga BBVA" for sponsorship reasons) was the 84th season of the premier association football league in Spain.  The campaign began on 23 August 2014 and ended on 24 May 2015.

2015 UEFA Europa League Final: The 2015 UEFA Europa League Final was the final match of the 2014–15 UEFA Europa League, the 44th season of Europe's secondary club football tournament organised by UEFA, and the sixth season since it was renamed from the UEFA Cup to the UEFA Europa League.  It was played at the National Stadium in Warsaw, Poland, on 27 May 2015, between Ukrainian side Dnipro Dnipropetrovsk and the title holders, Spanish side Sevilla.  Sevilla won the match 3–2 for a record fourth title.

2014–15 Sheffield Wednesday F.C. season: During the 2014–15 football season, Sheffield Wednesday F.C. competed in three professional football competitions.  Sheffield Wednesday competed in the 2014–15 Football League Championship (finishing 13th), 2014–15 FA Cup, and the 2014–15 Football League Cup.  It was the Owls' third consecutive season in the Football League Championship, having secured promotion from League One in the 2011–12 season, securing Championship safety on the last day of the 2012–13 season and securing a 16th-place finish last season.  The Football League season kicked-off at the beginning of August, along with the League Cup in the same month.  Meanwhile, with Sheffield Wednesday being within the top two-tiers of the English football league system, the club did not enter the FA Cup until the beginning of January 2015, where they entered at Round 3 of the competition.

2014–15 Feyenoord season: The 2014–15 season was Feyenoord's 107th season of play, it marked its 59th season in the Eredivisie and its 93rd consecutive season in the top flight of Dutch football.  It was first season with manager Fred Rutten.  The club was busy during the summer transfer window, selling or releasing of 12 players and signing 13 new players.  Feyenoord had a bad start of the season, dropping to 15th place in the league after losing three and drawing two of its first six league games.  They played only the second round of the KNVB Cup; they were knocked out by Go Ahead Eagles.  The club also lasted a single round in the Champions League; the third qualifying round consisted of two losses to Beşiktaş.  They reached the Europa League group stage by beating FC Zorya Luhansk 4–3 at home after an away draw.  The team improved after this early showing.  A five-game winning streak catapulted them to third place in the Eredivisie by mid fall.  They also reached the knockout phase of the Europa League by beating Standard Liège, HNK Rijeka and title holders Sevilla in the group phase.  They went into the winter break placed third in the league.

José Sevilla: Sevilla holds a degree in Economics and Business Studies from the Colegio Universitario de Estudios Financieros (CUNEF), which is affiliated to the Complutense University of Madrid.  He began his career in the investment banking sector, and worked at Merrill Lynch and FG Inversiones Bursatiles.  Sevilla worked at BBVA from 1997 to 2009, and was member of the Management Committee from 2003 to 2009.  He joined Bankia as an executive director in May 2012.  On 30 June 2014, he was appointed as CEO of Bankia.

2014–15 Sevilla FC season: The 2014–15 season is the 108th season in Sevilla FC's history, and 14th consecutive season in La Liga.  The team will compete in La Liga, the Copa del Rey, and the UEFA Europa League.

2015–16 Sevilla FC season: The 2015–16 season was the 109th season in Sevilla Fútbol Club's history, and 15th consecutive season in La Liga.  The team competed in La Liga, the Copa del Rey, and the UEFA Champions League.  Sevilla did not win any matches at away in the La Liga.

List of Sevilla FC seasons: Prior to 1929 Spain did not have a national football league.  Sevilla FC competed in the championship of the Southern region, called Campeonato Sur, the winners of which qualified for the Copa del Rey along with the other regional champions.  Sevilla became the champions of this league 17 times and runner-up 3 times.  Because there is not much information from this era, the list of seasons starts at the beginning of La Liga in the 1928-29 season.

Supporting paragraphs: 2014–15 Sevilla FC season 2014–15 La Liga
Answer: on 23 August 2014