user: Question: What Date after 2007 had the San Francisco 49ers as the Visiting Team?
Columns: ['Year', 'Date', 'Home Team', 'Result', 'Visiting Team', 'Venue']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2000.0, 'September 17', 'St. Louis Rams', '41-24', 'San Francisco 49ers', 'Trans World Dome']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Visiting Team" = 'San Francisco 49ers' AND "Year" > 2007.0;