1645

The year 1645 (in the Gregorian calendar) started on Sunday, January 1, and ended on Sunday, December 31.

Calendar with holidays
Holidays:
 * New Year's Day: Sunday, January 1
 * Epiphany: Friday, January 6
 * Valentine's Day: Tuesday, February 14
 * Mardi Gras: Tuesday, February 28
 * Ash Wednesday: Wednesday, March 1
 * Saint Patrick's Day: Friday, March 17
 * April Fools' Day: Saturday, April 1
 * Palm Sunday: Sunday, April 9
 * Good Friday: Friday, April 14
 * Easter: Sunday, April 16
 * Halloween: Tuesday, October 31
 * Christmas Eve: Sunday, December 24
 * Christmas: Monday, December 25
 * New Year's Eve: Sunday, December 31