CREATE TABLE table_51612 ("Date" TEXT, "Opponents" TEXT, "Score" TEXT, "Competition" TEXT, "Match Report" TEXT)

What is the date of the GC competition when the opponents are 1. FC Nuremberg?
SELECT "Date" FROM table_51612 WHERE "Opponents" = '1. fc nuremberg' AND "Competition" = 'gc'
SELECT "Date" FROM "table_51612" WHERE "Competition" = 'gc' AND "Opponents" = '1. fc nuremberg'