user: Question: When EMT 9 is the series what is the date?
Columns: ['Circuit', 'Location', 'Date', 'Series', 'Winning driver', 'Winning team']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Circuit de Catalunya', 'Montmeló , Spain', '18 April', 'FR3.5 1', 'Marcos Martínez', 'Pons Racing']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Series" = 'EMT 9';