user: Question: What was the date of the match against Jean-Julien Rojer, on a Clay surface?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['November 25, 2002', 'Aruba F1', 'Clay', 'Jean-Julien Rojer', '2–6, 2–6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Surface" = 'Clay' AND "Opponent" = 'Jean-Julien Rojer';