331

The year 331 started on Friday, January 1, and ended on Friday, December 31.

Calendar with holidays
Holidays:
 * New Year's Day: Friday, January 1
 * Mardi Gras: Tuesday, February 23
 * Ash Wednesday: Wednesday, February 24
 * Palm Sunday: Sunday, April 4
 * Good Friday: Friday, April 9
 * Easter: Sunday, April 11
 * Halloween: Sunday, October 31
 * New Year's Eve: Friday, December 31