Calendar

A calendar is a system for naming periods of time, typically days. These names are known as calendar dates. The dates may be based on the perceived motion of astronomical objects. A calendar is also a physical device (often paper) that illustrates the system (for example, a desktop calendar) — this is the most common usage of the word.

See also

• List of calendars
• liturgical year
• calendar of saints
• Christian calendar
• Eastern Orthodox Church calendar
• Calculating the Day of the Week
• Cycles
• Runic calendar
• French Republican Calendar
• Wall calendar
• Zoroastrian calendar
• iCalendar
• hCalendar