December 5, 1999, was a Sunday.
December 6 1999 was a Monday.
December 12 can fall on any day of the week.
25 December 1999 was a Saturday.
December 13 1999 was on a Monday.
December 7th 1999 was a Tuesday.
December 31 1999 was a Friday.
December 27th 1999 was a Monday.
December 3rd, 1999 was a Friday.
December 28, 1999 fell on a Tuesday.
December 10, 1999 fell on a Friday.
December 22nd, 1999 fell on a Wednesday.
21st December 12012 fall on Friday