CREATE TABLE table_46357 ("Date" TEXT, "Venue" TEXT, "Opponents" TEXT, "Score" TEXT, "Competition" TEXT, "Match Report" TEXT)

What is Date, when Competition is 'F', and when Opponents is 'FC Astoria Walldorf'?
SELECT "Date" FROM table_46357 WHERE "Competition" = 'f' AND "Opponents" = 'fc astoria walldorf'
SELECT "Date" FROM "table_46357" WHERE "Competition" = 'f' AND "Opponents" = 'fc astoria walldorf'