IN-DEPTH: A Glimpse at Eternity with IWC's Secular Calendar, the new Portugieser Eternal Calendar

@IWC Eternity is within reach with IWC’s first secular perpetual calendar, which won’t need adjusting until 3999, and a moon phase indicator that will remain accurate for 45 million years! IWC’s Portugieser Eternal Calendar is the undisputed calendar masterpiece of the Schaffhausen-based brand for Watches and Wonders 2024. A colossal technical milestone, the Eternal Calendar marks the brand’s first secular perpetual calendar. Unlike a perpetual calendar that will need a correction in 2100, the Eternal Calendar is fitted with a 400-year gear that overrides the Gregorian calendar’s complex leap year rule exceptions and skips three leap years over four centuries.