CREATE TABLE table_10521 ("Date" CLOB, "Visitor" CLOB, "Score" CLOB, "Home" CLOB, "Record" CLOB)

When was the game played against a visiting team from Philadelphia?
SELECT "Date" FROM table_10521 WHERE "Visitor" = 'philadelphia'
SELECT "Date" FROM "table_10521" WHERE "Visitor" = 'philadelphia'