It was a Thursday.
Wednesday.
31st May 1960 was a Tuesday.
May, 31st, 1985, was a Friday.
May 31st, 1986 fell on a Saturday.
May 31st, 1974 fell on a Friday.
May 31st, 1941 fell on a Saturday.
Sunday
31st May 1975 was a Saturday.
May 31, 1965, was a Monday.
May 31st, 1957 fell on a Friday. The following year, May 31st fell on a Saturday.
May, 5th, 1973, was a Saturday.
May 14 1973 was on a Monday.