In calendars, the A.D. year, the cyclic year, month, day and time are shown in a rotary manner such as is seen in watches and slot machines, and the A.D. year, the cyclic year, month, day, time and the like of the relevant day are illuminated in respective colors, and the day can be quickly recognized. A purpose of the present invention is to provide a perpetual calendar that is switched on and off by a proximity sensor or the like, and that uses a keyboard or the like of a computer or the like, a magnetic pen, and an erase lever. [Solution] A perpetual calendar in which, when approaching or moving away from a proximity sensor or the like, sections made from transparent plastic or the like are illuminated, the A.D. year, the cyclic year, month, day and time are rotated, and the day and date of the relevant day are illuminated. The perpetual calendar uses a keyboard, calculator or the like, and can be written on or erased from using buttons. The perpetual calendar also uses a white board or the like, a water-based pen, and a magnetic pen, as well as using a lever that erases all of the plans, agendas and schedules only by being moved vertically and horizontally. Furthermore, the "excellent luck" numbers and "everything you wish for" numbers, etc. are added to the numbers of the calendar, and the total sum is made a good number. The yin-yang and five elements theory and yin-yang arrangement of this calendar are adjusted to be in a good relationship in this calendar. The calendar has a magnet and/or a hook mounted on the back thereof to enable mounting to a refrigerator or the like.
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