Monday.
February 29, 1980 fell on a Friday.
Monday
29 December 1978 was a Friday.
29 December 1972 was a Friday.
December 29 1946 was a Sunday.
December 29 2010 was a Wednesday.
December 29, 1949 was a Thursday.
December 29, 1989 was a Friday.
November 29, 1980 fell on a Saturday.
Sunday
Tuesday
Wednesday.