CREATE TABLE table_58402 ("Date" CLOB, "Venue" CLOB, "Score" CLOB, "Result" CLOB, "Competition" CLOB)

Name the date that has a friendly competition at rheinpark stadion, vaduz
SELECT "Date" FROM table_58402 WHERE "Competition" = 'friendly' AND "Venue" = 'rheinpark stadion, vaduz'
SELECT "Date" FROM "table_58402" WHERE "Competition" = 'friendly' AND "Venue" = 'rheinpark stadion, vaduz'