in 2014-15 Sevilla competed in a league that began on which day ?
on 23 August 2014
Title: 2014–15 Sevilla FC season
Passage: 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.
Title: List of Sevilla FC seasons
Passage: 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.
Title: 2014–15 La Liga
Passage: 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.
2014–15 La Liga 2014–15 Sevilla FC season