September 17th (660) was a Monday. It's the 259th day of the year (260th in leap years) in the Gregorian calendar. There are 106 days left to the end of the year.
September 17th Holidays in History
» Christian feast day:
» Albert Avogadro
» Ariadne of Phrygia
» Hildegard of Bingen
» Lambert of Maastricht named Lambert
» Robert Bellarmine
» Satyrus of Milan
» Socrates and Stephen
» September 17 (Eastern Orthodox liturgics)
» Constitution Day (United States) named Constitution Day (observed on the previous Friday if it falls Saturday, the following Monday if on a Sunday), Citizenship Day, Von Steuben Day. (United States)
» Operation Market Garden is still remembered with parachuting and dedications on this day. (Netherlands)