| 摘要 |
An electronic timepiece has a date wheel for undergoing rotation in accordance with movement of an indicator to change a display state of a date display, a 24 hour wheel driven to undergo one complete rotation each 24 hour period in accordance with movement of the indicator, and a contact spring connected to the 24 hour wheel for rotation therewith. A circuit board has first and second electrode patterns electrically connected to each other by the contact spring. A switching circuit changes a voltage level of the first electrode pattern to a first voltage level. A detector outputs an initializing signal corresponding to detection of termination of an operation for interchanging a battery of the electronic timepiece or for correcting time. A controller inputs the initializing signal from the detector to place the switching circuit in an ON state for a preselected period of time when the voltage level of the first electrode pattern reaches a second voltage level supplied to the second electrode pattern during the preselected period of time. The controller places the switching circuit in an OFF state when the specific rotational position of the contact spring is detected, starts a first counting operation at intervals of 24 hours by a predetermined clock pulse, and rotates the date wheel to change a display state of the date display each time a result of the first counting operation reaches a value indicating elapse of 24 hours.
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