user: Question: When did stage 5 occur?
Columns: ['Stage', 'Date', 'Route', 'Stage Winner', 'GC Leader']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '6 September', 'Lisbon - Estoril', 'Lars Michaelsen', 'Lars Michaelsen']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Stage" = 5.0;