年表作成・共有サービス - pastport

https://www.shijinwatch.com/products/calender-watch/
The calendar watch usually is recognized by its watch dial. In general, the watch dial has three watch hands to display the minutes, hours, and seconds. Besides, there is a calendar window on this watch dial to display the date, month, and even the year.

SHIJIN CALENDER WATCH TYPES
Calendar Watches Varieties:

1. Monthly calendar: just a simple calendar, has a date display, usually generated by a disk.

2. Day Date: has a date and day of the week display.

3. Full or complete calendar: adds a month display, so it includes day, date month, and sometimes moon phase.

The there above types of calendar watches must be corrected manually in every month with less than 31 days.

4. Annual calendar: is a calendar displaying date and month (and sometimes day) that automatically adjusts the date displayed on the timepiece based on 30 and 31-day months. It requires setting the date only once a year, at the end of February.

5. Perpetual calendar:Not only can a perpetual calendar do everything an annual calendar watch is capable of doing, it will automatically adjust for leap years; there is no need to set it in February. The next time a perpetual calendar will need to be adjusted is in the year 2100.

THE BENEFITS OF SHIJIN CALENDER WATCH

Single calendar quartz watch
The simplest and most commonly used of all affordable annual calendar watch is the single perpetual calender watch. In terms of appearance, the two common types of single perpetual calendar quartz watch are the hand type and the window type. The pointer type refers to the usage of hands to indicate the date of the watch. It’s common that there is the large pointer type with an outer ring and the small pointer type with a small disc. The window type has a small window type and a large window with two small windows to indicate the date.

The Annual Calendar Watches
It's the first step toward automated calendar calculations. The display includes day, date, and month displays, and the open window or pointer design makes reading the time easier. Another distinctive feature of the annual calender watch is that the machine is able to distinguish between the 30-day month and the 31-day month, with the only errors arising from the transition from late February to early March. Thus the annual calendar watch requires one manual adjustment per year.

Perpetual Calendar
Since the annual calendar could not recognize leap months in leap years, the more complex perpetual calendar appeared. Perpetual calendar watches are more difficult to design because of the problem of dealing with leap year dates, so many models also feature leap year displays.