Calendar 🗓

A schedule is a method of organizing days for social, strict, business, or authoritative purposes. This is completed by assigning names to time periods, most commonly days, weeks, months, and years. A date is the assignment of a single, distinct day within such a framework. A schedule is also a physical record (typically on paper) of such a framework. A schedule can also refer to a list of scheduled events, such as a court schedule, or a partially or entirely sequential list of records, such as a wills schedule.

source
Periods in a schedule (for example, years and months) are generally, but not always, synchronized with the sun or moon's pattern. The lunisolar schedule, a lunar schedule that sporadically adds one intercalary month to stay synchronized with the sun-oriented year over the long haul, was the most well-known type of pre-current schedule.

The word "schedule" comes from the Latin word calendae, which refers to the first day of the month according to the Roman calendar. Calare, which means "to get out," refers to the new moon's initial "calling" as it was first observed. Calendarium in Latin meant "account book, register" (as records were closed and obligations were gathered on the calends of each month). The Latin phrase was adopted into Old French as calendier, and from that point on in Middle English as calender by the thirteenth century (the spelling pattern is prescient current).

The Gregorian calendar, which was introduced in 1582 as a result of perceptions of a protracted transition from the Julian calendar to the solar year, was the main change in timekeeping in the early modern era.

source

The World Schedule, Global Fixed Schedule, Holocene Schedule, and most recently, the Hanke-Henry Perpetual Schedule, are just a few of the current proposals for changing the schedule that have been made. Such ideas are occasionally put forth but fail to gain traction because of lost momentum, a radical change in how they are carried out, and stern opposition.