It was a Saturday.
The day of the week that July 12th falls on varies each year.
12th July 1966 was a Tuesday.
Saturday
Sunday
25 July 1975 was a Friday.
July 12, 1963, was a Friday.
July 12th 1985 was a Friday.
Saturday.
July 11, 1975 fell on a Friday.
July 9, 1975 fell on a Wednesday.
July 16, 1975 fell on a Wednesday.
July 10, 1975 fell on a Thursday.