The January page of a leap year is shown. On which date does the 256th day of that year fall?

Days up to the end of August in a leap year: 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 = 244. 256 − 244 = 12, so the 256th day is 12 September. (13 September is the answer in an ordinary year.)