CREATE TABLE table_12108 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent in the final" CLOB, "Score" CLOB)

What date was the game played on the hard surface at the Tournament of Sweden f2?
SELECT "Date" FROM table_12108 WHERE "Surface" = 'hard' AND "Tournament" = 'sweden f2'
SELECT "Date" FROM "table_12108" WHERE "Surface" = 'hard' AND "Tournament" = 'sweden f2'