user: Question: Which date has an Outcome of Runner-up, and an Opponent in the final of Gilles Simon?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score in the final']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '29 April 2012', 'BRD Năstase Ţiriac Trophy , Bucharest, Romania', 'Clay', 'Gilles Simon', '4–6, 3–6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Outcome" = 'Runner-up' AND "Opponent in the final" = 'Gilles Simon';