Adding a day of the week increased my amazement. There are many theories but not a conclusive one. Search here.
Can you imagine how did I feel when I was told that in USA there are buildings that don't have the 13th floor?
What kind of world's vision, what level of superstition have the people of a nation with this kind of leaders and history?
September, 11 or 9/11. Even tragic events respect the euphonic of numbers in America.
August, 6- 6/8? Nobody remembers. It's was in 1945.