September 6 2010 was a Monday.
Adding 100 days to September 6 in any year gives December 15 in the same year.
Monday. It would probably have been quicker and simpler to look at a calendar.
6 September 1958 was a Saturday.
6 September 1972 was a Wednesday.
September 6 1950 was on a Wednesday.
September 6, 1970 was a Sunday.
September 6 1952 was a Saturday.
September 6, 2008 was a Saturday.
September 6, 1954 was a Monday.
September 6 1963 was a Friday.
September 6 1929 was a Friday.
September 6, 1955 was a Tuesday.