Return the answer as one of the following values {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}.
Input: day = 31, month = 8, year = 2019 Output: "Saturday"
Input: day = 18, month = 7, year = 1999 Output: "Sunday"
Input: day = 15, month = 8, year = 1993 Output: "Sunday"
The given dates are valid dates between the years 1971 and 2100.