Egyptian days

During the Middle Ages in Europe, Egyptian days (dies Ægyptiaci) were certain days of the year held to be unlucky. The Egyptian days were:
 * January 1, 25
 * February 4, 26
 * March 1, 28
 * 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

These were days considered unlucky to begin any enterprise. Physicians were especially discouraged from performing bloodletting on the Egyptian days.