Table: peruvian_clasico_football
Columns: season
date
score
winner
venue
competition_round

Question: On what date did Universitario win the Torneo Apertura round after 2003 at Estadio Alejandro Villanueva?
SQL: SELECT "date" FROM peruvian_clasico_football WHERE "venue" = 'estadio alejandro villanueva' AND "season" > 2003 AND "competition_round" = 'torneo apertura' AND "winner" = 'universitario'