user: Question: On What Date is the Competition Semifinal that has a result of 2-1 aet?
Columns: ['Match', 'Date', 'Location', 'Lineup', 'Result', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ["Sweden 1995 FIFA Women's World Cup", "Sweden 1995 FIFA Women's World Cup", "Sweden 1995 FIFA Women's World Cup", "Sweden 1995 FIFA Women's World Cup", "Sweden 1995 FIFA Women's World Cup", "Sweden 1995 FIFA Women's World Cup"]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Competition" = 'Semifinal' AND "Result" = '2-1 aet';