user: Question: What was the date with a winner of km (mi)?
Columns: ['Date', 'Course', 'Distance', 'Type', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['25 April', 'Valladolid', 'km (mi)', 'Individual time trial', 'Tony Rominger ( SUI )']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Winner" = 'km (mi)';