400

The year 400 started on Sunday, January 1, and ended on Monday, December 31. It was a leap year (in the Julian calendar, which would also have been a century leap year in the proleptic Gregorian calendar). Also, it was the last year of the 4th century.

Calendar with holidays
Holidays:
 * New Year's Day: Sunday, January 1
 * Epiphany: Friday, January 6
 * Mardi Gras: Tuesday, February 14
 * Ash Wednesday: Wednesday, February 15
 * Leap Day: Wednesday, February 29
 * Palm Sunday: Sunday, March 25
 * Good Friday: Friday, March 30
 * Easter: Sunday, April 1
 * Halloween: Wednesday, October 31
 * Christmas Eve: Monday, December 24
 * Christmas: Tuesday, December 25
 * New Year's Eve: Monday, December 31