Write a boolean function @correct_date(d,m,y)@ that tells us whether day @d@ of month @m@ of year @y@ represents an actually correct date. Argument @y@ is always an int between 1800 and 9999. The rules to decide on february 29 for this interval of years can be found in exercise X91228: “Leap Years (2)”.
>>> correct_date(30, 11, 1971) True >>> correct_date(6, 4, 1971) True >>> correct_date(4, 8, 2001) True >>> correct_date(29, 2, 2001) False >>> correct_date(32, 11, 2005) False >>> correct_date(30, 11, 2004) True >>> correct_date(-20, 15, 2000) False