user: Question: What day was the ground Subiaco?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Ground', 'Crowd', 'Date', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Hawthorn', '11.11 (77)', 'Geelong', '12.16 (88)', 'MCG', 86179.0, 'Friday, 25 July', 'AFL.com.au']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Ground" = 'Subiaco';