The "calendar" provides the moon phase indications that take into account dates, weeks, months, and usually the number of days of the fish leap year in the month. It is a masterpiece of structure and microtechnology. The division of the Gregorian calendar for 31, 30, or 28 days (29 days in February of each year) poses a considerable challenge for watchmakers who must reproduce these changes in mechanical movement. The simple calendar that most calendars are equipped with must be manually adjusted 5 times each month of less than 31 days of the year. These simple calendars, on the other hand, were compared to watchmakers who originated in one of the artistic peaks of the late 18th century, which continued to show the correct time by adjusting the variable days of the month and taking leap year cycles into account. To achieve this feat, the movement uses 1,461 days or 4 years of "mechanical memory." Most perpetual calendar devices use differential gears from hour gears that can contain gears, gear sets, levers and other components up to hundreds in size. Calendar is still a classic among the complex functions, and never stopped bringing new interpretation and improvement. Its version is increasingly slimmer and incorporates sophisticated but intuitive correction systems. In the meantime, watch designers are embracing the innovative challenges of having multiple displays (date, day of the week, month, moon phase, leap year, year of the year, etc.) experimenting with a variety of different display modes (pointer, window, Jump time) to build from the real classic to truly original dial. Despite the name of the calendar, but still in the March 31, 2100 adjustment day. This is not the fault of the mechanism, but the weird part of the Gregorian calendar: it stipulates that this year, like 300 years in every 400 years, not a leap year. Only a few rare "eternal calendar" will take this special case into account. Watchmakers have also developed "almanacs" that recognize the length of each month except February and therefore require only one adjustment per year.
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