The 31st of July is the last day of the month of July. The specific day of the week will vary each year.
The feats day of Saint Ignatius of Loyola is on July 31.
July 31 1958 was a Thursday
July 31 1951 was a Tuesday.
July 31, 1997 was a Thursday.
July 31 1996 was on a Wednesday.
July 31 1970 was on a Friday.
July 31 1967 was a Monday.
July 31 1951 was a Tuesday.
July 31, 2005 fell on a Sunday.
July 31 1959 was a Friday.
July 31 2010 was a Saturday.
July 31, 2002 was a Wednesday.