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 July 1974 was a Friday.
The day of the week that July 12th falls on varies each year.
12th July 1966 was a Tuesday.
Sunday
It was a Saturday.
July 3 1974 was a Wednesday.
20 July 1974 was a Saturday.
July 8 1974 was a Monday.
July 10 1974 was a Wednesday.
July 12th 1985 was a Friday.
July 12, 1963, was a Friday.
Saturday.
July 14, 1974 fell on a Sunday.