user: Question: What is the Date with an Opponent that is Hearts?
Columns: ['Date', 'Opponent', 'Venue', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['25 January 1986', 'Morton', 'H', '4–0', 6938.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Hearts';