CREATE TABLE table_39504 ("Start date" CLOB, "End date" CLOB, "Pos." CLOB, "Player" CLOB, "To club" CLOB)

A player was moved to celtic had an end of what date?
SELECT "End date" FROM table_39504 WHERE "To club" = 'celtic'
SELECT "End date" FROM "table_39504" WHERE "To club" = 'celtic'