What is the meaning of Calendar?

Any system by which time is divided into days, weeks, months, and years.

A means to determine the date consisting of a document containing dates and other temporal information.

A list of planned events.

An orderly list or enumeration of persons, things, or events; a schedule.

An appointment book (US), appointment diary (UK)

To set a date for a proceeding in court, usually done by a judge at a calendar call.

To enter or write in a calendar; to register.

calendar

almanac

Source: wiktionary.org