Overview Perpetual calendar watch is actually a Chinese exaggeration commonly known, but the British more exaggerated, called "permanent calendar." Perpetual calendar refers to the ability to automatically identify the size of the month and the leap month, leap year, and adjust the calendar display function. The principle of the general mechanical watch calendar design is based on 31 days as a cycle. Therefore, in each of the 30-month-old Satsukums, the date figure must be manually shifted forward by one day. Calendar will be based on the end of the month on the 31st of the month, or on the 30th of the month, the correct jump to the next month on the 1st. And in the leap year once every 4 years to automatically adjust the February 29 calendar, known as the "large calendar," whereas the leap year can not be displayed as February 29, need to adjust the date of 4 years called "small Calendar. " However, the calendar is not really "million years." In every 200 years, there will be a leap year in February is only 28 days. The next February only 28 leap year is 2100, as in the last February only 28 day leap year is 1900. Quartz watches and mechanical watches are all calendar products. However, due to the structure of the mechanical perpetual calendar table is more complex, so the price is more expensive, and the mechanical watch "large calendar" is relatively "small calendar" complex and therefore more expensive. Movement perpetual calendar movement can be divided into two parts, one part in charge of hours, minutes and seconds of the general timing work, the other part is like a set of astronomical self-walking mode, which operates with a miniature satellite gear system, The entire system takes four years to rotate a week. With this system, perpetual calendar watches can be calculated in the calendar of the size of the month, leap year and other clearly. Perpetual calendar watch the surface display is similar, most of them must have the general watch without the month and leap year display. Less often is to have the year display function, designers may think few people need to confirm the year from the watch! Year performance in two ways, one is a four-digit year window, such as DaVinci calendar IWC. Jaeger-LeCoultre watches are like the early computers, which used a two-digit year format to save space, but did not guarantee the millennium bug.

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