user: Question: Name the date for Zi Yan Jie Zheng opponent
Columns: ['Outcome', 'Date', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '17 June 2001', 'Hard', 'Tatiana Perebiynis', 'Petra Mandula Patricia Wartusch', '1–6, 4–6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponents" = 'Zi Yan Jie Zheng';