user: Question: What was the date that a player went to the club Doncaster Rovers?
Columns: ['Exit Date', 'Pos.', 'Player', 'To club', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1 July 2008', 'DF', 'Garry Breen', 'Hereford United', 'Free']
SQL:

assistant: SELECT "Exit Date" FROM "Table" WHERE "To club" = 'Doncaster Rovers';