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The year 2644 will start on Monday, January 1, and end on Tuesday, December 31. It will be a leap year.

Calendar with holidays
Holidays:
 * New Year's Day: Monday, January 1
 * Epiphany: Saturday, January 6
 * Martin Luther King Jr. Day: Monday, January 15
 * Groundhog Day: Friday, February 2
 * Super Bowl Sunday: Sunday, February 4
 * Lincoln's Birthday: Monday, February 12
 * Valentine's Day: Wednesday, February 14
 * Washington's Birthday: Monday, February 19
 * Leap Day: Thursday, February 29
 * Mardi Gras: Tuesday, March 5
 * Ash Wednesday: Wednesday, March 6
 * Daylight Saving Time Starts (clocks spring forward): Sunday, March 10 at 2:00 AM, which becomes 3:00 AM
 * Pi Day: Thursday, March 14
 * Saint Patrick's Day: Sunday, March 17
 * Cesar Chavez Day: Sunday, March 31
 * April Fools' Day: Monday, April 1
 * Palm Sunday: Sunday, April 14
 * Good Friday: Friday, April 19
 * Easter: Sunday, April 21
 * Earth Day: Monday, April 22
 * Cinco de Mayo: Sunday, May 5
 * Mother's Day: Sunday, May 12
 * Armed Forces Day: Saturday, May 18
 * Memorial Day: Monday, May 27
 * Flag Day: Friday, June 14
 * Father's Day: Sunday, June 16
 * Juneteenth: Wednesday, June 19
 * Independence Day: Thursday, July 4
 * Labor Day: Monday, September 2
 * National Grandparents' Day: Sunday, September 8
 * Patriot Day: Wednesday, September 11
 * Constitution Day: Tuesday, September 17
 * Columbus Day: Monday, October 14
 * Indigenous Peoples' Day: Monday, October 14
 * Sweetest Day: Saturday, October 19
 * National Trick or Treat Day: Saturday, October 26
 * Halloween: Thursday, October 31
 * Daylight Saving Time Ends (clocks fall back): Sunday, November 3 at 2:00 AM, which becomes 1:00 AM
 * Election Day: Tuesday, November 5
 * Veterans Day: Monday, November 11
 * Thanksgiving: Thursday, November 28
 * Black Friday: Friday, November 29
 * Small Business Saturday: Saturday, November 30
 * Cyber Monday: Monday, December 2
 * Giving Tuesday: Tuesday, December 3
 * Pearl Harbor Remembrance Day: Saturday, December 7
 * Christmas Eve: Tuesday, December 24
 * Christmas: Wednesday, December 25
 * Kwanzaa: Thursday, December 26, 2644, to Wednesday, January 1, 2645
 * New Year's Eve: Tuesday, December 31