It was a Tuesday.
Tuesday
Monday
April 12 1951 was on a Thursday.
April 4, 1951 was on a Sunday.
April 19, 1951 was a Thursday.
April 25, 1951 was a Wednesday.
If you mean what day of the week in 1951, then it would be a Sunday.
April 5, 1951 fell on a Thursday.
April 13, 1951, fell on a Friday.
April 21, 1951 fell on a Saturday.
April 24th, 1951 fell on a Tuesday.
April 6, 1951 fell on a Friday.