| 摘要 |
A perpetual calendar structure comprising an outer casing, an interior frame, a driver, a clock control and a power source including a battery, in which the outer casing has windows for display of date, month, weekday and time, the interior frame in incorporated with a date display set, a month display set, and a weekday display set each aligning with their respective windows, the clock control is aligned with the time display window, and is used to give a signal at the end of each rotation of a cycle of 12-hour period to control the driver to cause a weekday driver to turn the weekday display set to next plate showing a weekday and A.M. or P.M., a date driver to turn the date display set to next plate showing a date after every two weekday plates are turned, and a month driver to turn the month display set to next plate showing a month after 31 date display plates are turned automatically without the need of manual control.
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