Monday
13 September 1948 was a Monday.
November 13 1948 was a Saturday.
April 13, 1948 was a Tuesday.
January 13, 1948 fell on a Tuesday.
It was a Friday.
Friday
It was a Thursday.
Monday
It was a Tuesday.
That was on a Friday.
13 September 1957 was a Friday.
September 13 1959 was on a Sunday.