April 1, 1973 fell on a Sunday.
Tuesday. You can check it here - http://www.timeanddate.com/calendar/?year=1973&country=1
November 1 1973 was a Thursday.
June 1 1973 was on a Friday.
May 1, 1973 fell on a Tuesday.
January 1, 1973 fell on a Monday.
October 1, 1973 fell on a Monday.
It was a Saturday.
It was a Thursday.
September 1, 1973 fell on a Saturday.
April 1 1967 was a Saturday.
April 1 1977 was on a Friday.
April 1 1948 was a Thursday.