Question: when did mac miller release best day ever
[{'answer': 'March 11 , 2011', 'provenance': [{'wikipedia_id': '31433899', 'title': 'Best Day Ever (mixtape)', 'start_paragraph_id': 1, 'start_character': 104, 'end_paragraph_id': 1, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]