1644

The year 1644 (in the Gregorian calendar) started on Friday, January 1, and ended on Saturday, December 31. It was a leap year.

Calendar with holidays
Holidays:
 * New Year's Day: Friday, January 1
 * Epiphany: Wednesday, January 6
 * Mardi Gras: Tuesday, February 9
 * Ash Wednesday: Wednesday, February 10
 * Valentine's Day: Sunday, February 14
 * Leap Day: Monday, February 29
 * Saint Patrick's Day: Thursday, March 17
 * Palm Sunday: Sunday, March 20
 * Good Friday: Friday, March 25
 * Easter: Sunday, March 27
 * April Fools' Day: Friday, April 1
 * Halloween: Monday, October 31
 * Christmas Eve: Saturday, December 24
 * Christmas: Sunday, December 25
 * New Year's Eve: Saturday, December 31