May 13th, 1981 fell on a Wednesday. The following year, it fell on a Thursday.
October 13 1981 was a Tuesday.
October 13, 1981 was on a Tuesday.
April 13, 1981 fell on a Monday.
December 13, 1981 fell on a Sunday.
August 13th 1981 was a Thursday.
May 25, 1981 was a Monday.
May 18, 1981 was a Monday.
May 16 1981 was a Saturday.
23rd May 1981, was a Saturday.
21st May 1981, was a Thursday.
May 23, 1981 was a Saturday.