Taking just the 20th and 21st centuries, the 21st of May is a Saturday in 1904, 1910, 1921, 1927, 1932, 1938, 1949, 1955, 1960, 1966, 1977, 1983, 1988, 1994, 2005, 2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061, 2067, 2072, 2078, 2089 and 2095.
May 21, 1921, was a Saturday.
In 1977, when it was on a Thursday. In the other two years, the 21st of April was on a Saturday.
Saturday (May 21, 1960).
It was a Saturday.
Nov 21 1953 was a Saturday.
Saturday
Saturday
Saturday
Saturday
June 21, 1997 was a Saturday.
July 21, 1956 fell on a Saturday.
January 21, 1984 was a Saturday.