calendar

A calendar is a system for organizing and keeping track of time, typically divided into days, weeks, months, and years. It helps people plan events, schedules, and activities. There are various types of calendars, like the Gregorian calendar commonly used today, which has 12 months and 365 or 366 days in a leap year. Calendars also mark important dates, such as holidays, seasons, and cultural observances. They help in coordinating daily life and understanding the passage of time, serving both personal and societal needs.