Christmas was last on a Monday in 2023, and the next time Christmas will be on a Monday will be in 2044. Christmas is one of the most important holidays celebrated worldwide, with different customs and traditions observed in different countries. In many Western countries, Christmas is a time for family and religious gatherings, gift-giving, decorating trees, and sharing a feast. The exact date of Christmas varies depending on the calendar system used and the country's religious practices. In the Gregorian calendar, which is the most widely used calendar system today, Christmas falls on December 25th.