July 21st, 1977 fell on a Thursday.
This depends on the year. July 21st has occurred on every day of the week.
21st July 1969 was a Monday.
21st July 1970 was a Tuesday.
21st July 2010 is a Wednesday.
July 21st, 1959 fell on a Tuesday.
July 21st, 2001 fell on a Saturday.
It was a Wednesday
It was a Thursday.
Wednesday.
Saturday
1st July 1977 was a Friday.
July 9th 1977 was a Saturday.