In watchmaking, "perpetual calendar" describes a calendar mechanism that correctly displays the date on the watch "perpetually", taking into account the different lengths of the months as well as leap years.

Dec 9, 2025 · The meaning of PERPETUAL CALENDAR is a table for finding the day of the week for any one of a wide range of dates.

Nov 4, 2025 · Perpetual calendars calculate the day of the week for any date across centuries. They use mathematical patterns in the Gregorian calendar that repeat in cycles.

What is a Perpetual calendar? A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in ...

One of these methods is the perpetual calendar function, also known as QP (from the French quantième perpétuel). Calendar complications for watches fall into three distinct categories: Simple or complete, …

Aug 2, 2024 · Unlike standard calendars that need to be replaced each year, a perpetual calendar allows you to see any date across multiple years. This makes it an invaluable resource for anyone …

Perpetual calendar definition: a calendar devised to be used for many years, as in determining the day of the week on which a given date falls.. See examples of PERPETUAL CALENDAR used in a …

a calendar mathematically arranged so that the correct day of the week can be determined for any given date over a wide range of years

Aug 25, 2025 · An annual calendar shows one year at a time and needs to be replaced or updated every year, while a perpetual calendar is designed to work year after year without replacement, …

A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.