Tuesday. You can check it here - http://www.timeanddate.com/calendar/?year=1973&country=1
10 December 1973 was a Monday.
September 10, 1973 was on a Monday.
10 November 1973 was a Saturday.
was a pleasant day
February 10, 1973, was a Saturday.
10 April 1912 was a Wednesday.
10 April 1994 was a Sunday.
April 10 1957 was on a Wednesday.
April 10 2000 was a Monday.
April 10 1989 was a Monday.
April 10, 1954 was a Saturday.
April 10, 1977 was a Sunday.