user: Question: What date was Notts County the opponent and the league position was 1st?
Columns: ['Date', 'Opponents', 'H / A', 'Result F – A', 'Attendance', 'League position']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['17 August 1991', 'Notts County', 'H', '2 – 0', 46278.0, '1st']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponents" = 'Notts County' AND "League position" = '1st';