A calendar shows time in chronological order, in order to help visualize the trends over time or to plan ahead. The most common type of calendar used internationally, the Gregorian calendar, divides time into years consisting of 12 months, 52 weeks, and 365 days. Each day is designated a unique date as identification. Calendars serve as a useful organizational tool, allowing events and meetings to be planned, projects to be tracked, future events to be identified, etc. Important events, meetings, and holidays can be marked on calendars and can be shared between teams in order to improve collaboration. A calendar is typically displayed as a grid, with a separate gird for each month, divided into seven columns, and five to six rows. However, the level of detail and format of a calendar is not fixed, and can be adapted based on requirements.
Shared calendars can facilitate collaborative planning. However, depending on the purpose, a balance is needed between the detailed, daily view, and the broader monthly or yearly view.