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The week of June 21st.
This depends on the year. July 21st has occurred on every day of the week.
21st of November 1984 was a Wednesday.
January 21st 2010 is a Thursday.
21st April 1954 was a Wednesday.
April 21st 1950 was a Friday.
October 21st 1947 was a Tuesday.
January 21st, 1900 was a Sunday.
21st Feb 1946 was a Thursday.
April 21st, 1970 was a Tuesday.
21st July 1970 was a Tuesday.
21st July 1969 was a Monday.