866

The year 866 started on Tuesday, January 1, and ended on Tuesday, December 31.

Calendar with holidays
Holidays:
 * New Year's Day: Tuesday, January 1
 * Epiphany: Sunday, January 6
 * Valentine's Day: Thursday, February 14
 * Mardi Gras: Tuesday, February 19
 * Ash Wednesday: Wednesday, February 20
 * Saint Patrick's Day: Sunday, March 17
 * Palm Sunday: Sunday, March 31
 * Good Friday: Friday, April 5
 * Easter: Sunday, April 7
 * Halloween: Thursday, October 31
 * Christmas Eve: Tuesday, December 24
 * Christmas: Wednesday, December 25
 * New Year's Eve: Tuesday, December 31