Calendar
From Wikipedia, a free encyclopedia written in simple English for easy reading.
A calendar is a system for assigning calendar dates to days. The dates may be based on how things in the sky seem to move, like the Sun or moon.
A calendar is also something (often paper) that shows the system in writing (for example, a desktop calendar).
The term is also used to mean a set of planned events (for example, court calendar). The calendar most commonly used by people is the Gregorian Calendar.
This short article can be made longer. You can help Wikipedia by adding to it.