An electronic timepiece calendar circuit whereby the display of at least the date is automatically effected during both leap years and non-leap years is provided. The electronic timepiece calendar circuitry includes a date counter that is indexed by a count of one from a count of one to at least 31 and thereafter is returned to a count of one to begin counting the dates of the next month. A month counter is provided for being indexed by one through a count of one to at least 12 each time the date counter is returned to a count of one and further is adapted to produce a signal representative of the count thereof. A control circuit is provided for receiving the month signal produced by the month counter and in response thereto returns the count of the day counter to one when the count of the month counter is two and the date counter is changed from 28 to 29 or from 30 to 31 depending on whether a leap year signal is applied thereto. The leap year signal is produced by year circuitry including a first year counter adapted to be indexed through a counting cycle of one to nine and a ten year counter series connected to the year counter that is adapted to be indexed through at least one odd and even counting cycle in response to each return of the month counter to a count of zero. A judging circuit is provided for detecting when the count of the year counter is zero, four and eight and the count of the 10 year counter is even, or alternatively, when the count of the year counter is two or six and the count of the 10 year counter is odd, and in response to detecting either alternative, applying a leap year signal to the control circuit.
An alcohol and tobacco age identification perpetual calendar specifically designed for cashiers of the stores that sells alcohol or tobacco products to check customer's identification and can easily verify customer's age before making the sales.
A perpetual calendar device as set forth which continually maintains a display of the present month and day as well as the minimum birth year for an individual who is entitled to purchase alcohol or tobacco products. The displays of the birth year information can be switched back and forth between the alcohol birth year display and the tobacco birth year display as desired to prevent confusion by the clerk. The displays are identified. The device is adapted for use by store clerks and the like to check to determine whether an individual wishing to purchase these products has attained the minimum age required.
An electronic wristwatch having a calendar display arrangement that is capable of memorizing and displaying date information is provided. Specifically, a digital display that is capable of displaying calendar information is coupled to a calendar display memory that is capable of selectively storing a plurality of predetermined dates therein. Operative means are coupled to the memory and the calendar display for effecting a display of the plurality of dates stored in the memory by the calendar display.
A calendar data display controller may display the calendar of a desired month with various calendar data in a calendar display section which is provided in a display unit, together with a numerical data display section for displaying numerical data. The calendar is displayed in a given format in a manner that, in accordance with an instruction given by depressing a CAL key provided on a keyboard for instructing a calendar display, data is prepared representing specific calendar data such as data representing the date corresponding to a specific day (for example, Sunday) of the week and/or a holiday, a day set by an operator, today, and the day as a result of date calculation, and the prepared data is sent out to a display drive unit.
This invention provides a leap year compensation circuit. Date data from an electronic watch circuit is compared with leap year data from a memory circuit. If this date data represents a leap year, the next day after the end of February is corrected to a date in a leap year calender. Leap year compensated date data is set in the watch circuit.
