user: Question: What was the date with a Hilly stage?
Columns: ['Date', 'Course', 'Distance', 'Type', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['18 May', 'Bari to Bari', 'km (mi)', 'Individual time trial', 'Gianni Bugno ( ITA )']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Type" = 'Hilly stage';