May 18, 1986 fell on a Sunday.
18 September 1986 was a Thursday.
It was a Saturday.
18 May 1962 was a Friday.
May 18 1933 was a Thursday.
May 18 2010 was a Tuesday.
May 18, 2009 was a Monday.
May 18, 1998, fell on a Monday
May 18, 1966 fell on a Wednesday.
May 18, 1964 fell on a Monday.
May 18, 1973 fell on a Friday.
May 18, 1957 fell on a Saturday.
Friday. You can find a day of week calculator at this site. Just enter in the date and it will calculate it for you: http://www.searchforancestors.com/utility/dayofweek.html