CREATE TABLE table_50953 ("School" TEXT, "Location" TEXT, "Enrolment" FLOAT, "Founded" FLOAT, "Denomination" TEXT, "Boys/Girls" TEXT, "Day/Boarding" TEXT, "Year Entered Competition" FLOAT)

Which is the earliest founded day school to have entered the competition after 1958?
SELECT MIN("Founded") FROM table_50953 WHERE "Day/Boarding" = 'day' AND "Year Entered Competition" > '1958'
SELECT MIN("Founded") FROM "table_50953" WHERE "Day/Boarding" = 'day' AND "Year Entered Competition" > '1958'