Telling the time has always been the purpose of a watch. With the countless technical advances in the world of watchmaking, mechanisms have rapidly evolved, becoming increasingly demanding in the process. Today, the most sophisticated luxurySwiss watchescome with additional functions such as a calendar: one of the rarest and most complex watchmaking complications.

What Makes Them Complex?
These watches use intricate systems of gears and cogs (often hundreds) to track the Gregorian calendar, a testament to mechanical ingenuity, requiring significant skill to design and assemble. 

Types of Calendar Complications

  • Perpetual Calendar: The most complex; automatically accounts for all month lengths and leap years (except for the 2100 exception), needing virtually no manual setting.
  • Annual Calendar: Adjusts for 30/31-day months but requires a manual date change at the end of February.
  • Full Calendar (Complete Calendar): Shows the day, date, and month, but requires monthly adjustment as it doesn’t know which months have 30 or 31 days.
  • Moonphase: Displays the lunar cycle, often combined with other calendar functions. 

Shown below are just a few examples of these beautiful and complex watches

Baltic
Blancpain
Breitling Super Chronomat
Frederque constant calendar
Habring constant calendar
Furlan perpetual
IWC Portugiese

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