The day-name associated with any date under the Gregorian Calendar is determined by a process which first identifies, from tabulated data correlated to seven day-name categories, the day-name assigned to the first day of a centesimal year. Additional tabulated data correlates the day-name for the first...http://www.google.com/patents/US5222052?utm_source=gb-gplus-sharePatent US5222052 - Time breaker
