Saturday
July 6th 1990 was a Friday.
July 1 1990 was a Sunday.
July 30, 1990 was a Monday.
July 10, 1990 fell on a Tuesday.
July 21, 1990 fell on a Saturday.
This depends on the year. July 21st has occurred on every day of the week.
Wednesday
Sunday
Tuesday
Thursday.
monday
It was a Friday.