user: Question: What date was the match on a Clay surface against Andrea Hlaváčková?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '13 October 2002', 'Ain Alsouknha', 'Clay', 'Aurelija Miseviciute', '6–4, 6–1']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Surface" = 'Clay' AND "Opponent" = 'Andrea Hlaváčková';