637

The year 637 started on Wednesday, January 1, and ended on Wednesday, December 31.

Calendar with holidays
Holidays:
 * New Year's Day: Wednesday, January 1
 * Epiphany: Monday, January 6
 * Valentine's Day: Friday, February 14
 * Mardi Gras: Tuesday, March 4
 * Ash Wednesday: Wednesday, March 5
 * Saint Patrick's Day: Monday, March 17
 * Palm Sunday: Sunday, April 13
 * Good Friday: Friday, April 18
 * Easter: Sunday, April 20
 * Halloween: Friday, October 31
 * Christmas Eve: Wednesday, December 24
 * Christmas: Thursday, December 25
 * New Year's Eve: Wednesday, December 31