Thursday.
September 4, 1959 fell on a Friday.
22 September 1959 was a Tuesday.
September 1 1959 was a Tuesday.
27 September 1959 was a Sunday.
September 20, 1959 fell on a Sunday.
September 8, 1959 was a Tuesday.
15 September 1959 was a Tuesday.
24 September 1959 was a Thursday.
September 13 1959 was on a Sunday.
September 10 in 1959 was on a Thursday.
September 1 1959 was on a Tuesday.
September 26th, 1959 fell on a Saturday.