The day of the week that July 12th falls on varies each year.
12th July 1966 was a Tuesday.
July 12, 1963, was a Friday.
Sunday
It was a Saturday.
July 12th 1985 was a Friday.
Saturday.
July 12th, 2003 fell on a Saturday. The following year, it fell on a Monday.
July 12th, 2005 was a Tuesday. It was on this day that the London police identified the suspects of the 2005 London bombings.
July 12, 1974 was a Friday. See the Related Link below for a great website that can answer all these kinds of questions for you (only back to the year 1900 though).
12th June1968 was on a Wednesday.
July 12th 1948 Ramadan.
April 12th, 1861, was a Friday.