CREATE TABLE table_4350 ("Date" TEXT, "Venue" TEXT, "Score" TEXT, "Result" TEXT, "Competition" TEXT)

When did a Competition of friendly, and a Score of 2 1, and a Venue of philadelphia , pennsylvania occur?
SELECT "Date" FROM table_4350 WHERE "Competition" = 'friendly' AND "Score" = '2–1' AND "Venue" = 'philadelphia , pennsylvania'
SELECT "Date" FROM "table_4350" WHERE "Competition" = 'friendly' AND "Score" = '2–1' AND "Venue" = 'philadelphia , pennsylvania'