---
type: guide
title: "How to Design a Perpetual Calendar That Works for Any Year"
description: "What an eternal calendar is, the fourteen layouts every Gregorian year falls into, and how to lay out an undated grid people can write on and reuse for years."
resource: https://www.4over4.com/guide/how-to-design-a-perpetual-calendar
tags: ["guide"]
generated:
  by: "process:4over4-mapp-build"
  at: 2026-09-16T23:13:27.757Z
timestamp: 2026-09-16T23:13:27.757Z
sources:
  - resource: https://www.4over4.com/guide/how-to-design-a-perpetual-calendar
    title: "How to Design a Perpetual Calendar That Works for Any Year"
status: stable
---

# How to Design a Perpetual Calendar That Works for Any Year

What an eternal calendar is, the fourteen layouts every Gregorian year falls into, and how to lay out an undated grid people can write on and reuse for years.

See [all guide concepts](index.md).

- Page type: guide
- URL: https://www.4over4.com/guide/how-to-design-a-perpetual-calendar