Calendar

System for organizing days.

diary schedule

A calendar is a system of organizing days for social, religious, or commercial purposes. Calendars may be lunar, solar, or lunisolar.

/kæˈlɪndər/

The word 'calendar' derives from the Roman calendar based on the Latin kalendae, meaning 'the first day of the month'.

schedule timetable

time system record keeping

Gregorian calendar Julian calendar lunar calendar solar calendar

days weeks months years

time management historical record

artificial time unit