Three months before July 17 is April 17. To arrive at this date, you simply count back three months from July: June, May, and then April. Therefore, the day is April 17.
17 July 1996 was a Wednesday.
July 17, 1969 fell on a Thursday.
July 17 1957 was on a Wednesday.
July 17, 1926 was a Saturday.
July 17, 1986 was a Thursday.
July 17, 1954 was a Saturday.
July 17 1967 was a Monday.
July 17 2010 was a Saturday.
July 17 1976 was a Saturday.
July 17, 1965 fell on a Saturday.
July 17, 1960 fell on a Sunday.
July 17, 1944 fell on a Monday.