Breitling Perpetual Calendar. The precision chronograph specialist breitling is celebrating the anniversary of its 1884 founding with watches that needn’t be reset for date until the year 2100. The perpetual calendar is equipped with the full calendar and moonphase, and adjusts for the individual months with 28, 30 and 31 days, 29 days for february when it’s a.

Now, 15 years later, the brand’s artistry has reached a new level with the caliber b19. A perpetual calendar gets around that by ‘knowing’ how many days there are in a month.