D-4) Programming and Data Acquisition with the Arduino Have you ever wondered what day you were born on? Well, there is a way, and its based on the "Zeller's Algorithm. "Zeller's" Algorithm can be used to determine the day of the week for any date in the past, present or future, between 1582 and 4902. The algorithm proceeds as follow Get the day (nday), the month (nmonth) and year (nyear) of birth Check if nmonth