How Perpetual Calendars Track Month Lengths and Leap Years Until 2100

First reported

Haute Time · 19 Oct 2026, 16:48 UTC

Found by WristBible

19 Oct 2026, 16:48 UTC

Sources

1

Perpetual calendar watches use a 48-month program wheel to account for differing month lengths and leap years. The mechanism automatically tracks 30- and 31-day months and the leap-year cycle without calendar correction until 2100.

Summary written by WristBible's AI editor from the publishers' reporting.

Coverage

• Haute TimeThe Perpetual Calendar: The Complication That Won’t Need You Until 210019 Oct 2026, 16:48 UTC