Saturday.
January 18, 1959 fell on a Sunday.
It was a Wednesday.
It was a Tuesday.
18th May 1959 was a Monday
March 18th 1959 was a Wednesday.
I was born that day :-)
18 July 1950 was a Tuesday.
July 18, 1985 was a Thursday.
July 18, 1942 was a Saturday.
July 18 2010 was a Sunday.
February 18, 1959 fell on a Wednesday.
July 18, 1979 fell on a Wednesday.