It was a Sunday.
Monday
February 13 1989 was a Monday.
February 13 1967 was on a Monday.
Tuesday
Wednesday
It fell on a Thursday.
Stockard Channing was born on February 13, 1944
Jerry Springer was born on February 13, 1944
April 13 1944 was a Thursday.
September 13 1944 was a Wednesday.
January 13, 1944 fell on a Thursday.
May 13, 1944 fell on a Saturday.