user: Question: On what date was the Essendon home match?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '12.14 (86)', 'Richmond', '20.11 (131)', 'Princes Park', 19519.0, '18 July 1981']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Home team" = 'Essendon';