CREATE TABLE table_38228 ("Date" TEXT, "Visitor" TEXT, "Score" TEXT, "Home" TEXT, "Attendance" FLOAT, "Record" TEXT, "Points" FLOAT)

Which Date has a Visitor of boston?
SELECT "Date" FROM table_38228 WHERE "Visitor" = 'boston'
SELECT "Date" FROM "table_38228" WHERE "Visitor" = 'boston'