user: Question: What date was the 1500 m freestyle competition?
Columns: ['Event', 'Time', 'Nationality', 'Date', 'Meet', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['50 m freestyle', '22.06', 'Russia', '14 July 2013', '2013 Championships', 'Poznan , Poland']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Event" = '1500 m freestyle';