A calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days. The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31.

One in five to six years has a 53rd week which is usually appended to the last quarter. It is then 98 days instead of 91 days long, which complicates comparisons. In the Chinese calendar, the quarters are traditionally associated with the 4 seasons of the year:

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From comprehensive annual views to detailed daily planners, these calendars provide the framework for effective time management throughout the year. Year-at-a-glance calendars display all 12 months on a single page, offering a comprehensive overview of the entire year.