840

The year 840 started on Thursday, January 1, and ended on Friday, December 31. It was a leap year.

Calendar with holidays
Holidays:
 * New Year's Day: Thursday, January 1
 * Epiphany: Tuesday, January 6
 * Mardi Gras: Tuesday, February 10
 * Ash Wednesday: Wednesday, February 11
 * Valentine's Day: Saturday, February 14
 * Leap Day: Sunday, February 29
 * Saint Patrick's Day: Wednesday, March 17
 * Palm Sunday: Sunday, March 21
 * Good Friday: Friday, March 26
 * Easter: Sunday, March 28
 * Halloween: Sunday, October 31
 * Christmas Eve: Friday, December 24
 * Christmas: Saturday, December 25
 * New Year's Eve: Friday, December 31