CREATE TABLE table_name_83 (date VARCHAR, race_leader VARCHAR, stage VARCHAR)

Which date has a Race Leader of hermann buse ( ger ), and a Stage of 5?
SELECT date FROM table_name_83 WHERE race_leader = "hermann buse ( ger )" AND stage = "5"
SELECT "date" FROM "table_name_83" WHERE "5" = "stage" AND "hermann buse ( ger )" = "race_leader"