A calendar is a system of organizing days for social, spiritual, industrial, or administrative functions. The phrase “calendar” comes from the Latin phrase “calends,” which referred to the primary day of the month within the Roman calendar. Calendars are used to maintain observe of appointments, occasions, and holidays. Companies use calendars to schedule conferences, observe deadlines, and plan initiatives. Colleges use calendars to plan the educational yr and schedule lessons and exams. Households use calendars to maintain observe of appointments, actions, and holidays.
The Gregorian calendar is essentially the most extensively used calendar on the planet at present. It was launched in 1582 by Pope Gregory XIII and is predicated on the photo voltaic yr, which is the time it takes for the Earth to orbit the solar. The Gregorian calendar has 12 months, with 28 days in February in a typical yr and 29 days in February in a bissextile year. Leap years happen each 4 years, apart from years which can be divisible by 100 however not by 400.
