Although a popular concept with Medieval calendars, Egyptian Days were supposedly listed by Egyptian astrologers as being unlucky. New enterprises and surgeries should not be performed on these days:

January 1, 26

February 4, 26

March 1, 18

April 10, 20

May 3, 25

June 10, 16

July 13, 22

August 1, 30

September 3, 21

October 3, 22

November 5, 28

December 7, 22