JP2884377B2 - Electronic device with day display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device with a calendar, and more particularly to an electronic device with a day display.

[0002]

2. Description of the Related Art Heretofore, there has been known an electronic device such as a clock or an electronic organizer which has a calendar function and displays the day of the week together with the date. These devices usually calculate the day of the week by programming. The calculation method is based on the fact that the beginning of the year, that is, the day of the week of January 1 changes periodically in a 28-year cycle,
The day of the week index is selected and the 1st and 1st of the month to be displayed further
The amount of deviation of the day of the week from the day is selected, and these are added. Further, the remainder of the number obtained by adding the day to be displayed is obtained, thereby obtaining the day index of the day to be displayed. Was.

[0003]

In the Christian calendar, the Julian calendar established in the ancient Roman period was used until October 4, 1582, and the next day after October 4 was October 15, and thereafter the Gregorian calendar was used. Used. In the Julian calendar, one year is 365.25 days, and one leap year is provided every four years. However, the actual year is 365.422.
At the beginning of the 6th century, there was a delay of more than 10 days from the actual operation of the sun. Gregorio 1 corrected this
The Gregorian calendar adopted by the third generation and adopted thereafter.

At present, the Gregorian calendar, which is used almost all over the world, has a year of 365.422 days, and it is similar to the Julian calendar to provide a leap year once every four years. The divisible year is a normal year, and the exception is the leap year that is divisible by 400 years.
The conventional means corresponds to the Gregorian calendar, and cannot correspond to the Julian calendar which is the previous calendar as it is. For this reason, when the range of the calendar display is over the calendar change of October 1582, there is a problem that the calculation cannot be performed by the conventional method.

[0005]

In order to solve the above-mentioned problems, according to the present invention, the input calendar data is data under the Julian calendar, data under the Gregorian calendar, or the Julian calendar. Calendar data discriminating means for discriminating whether the data is during the calendar change from the Julian calendar to the Gregorian calendar, and calendar data correcting means for correcting the first day of the Gregorian calendar when the calendar data is between the Julian calendar and the Gregorian calendar And a Julian day calculating means for calculating Julian day by an arithmetic expression corresponding to each calendar, and a day index calculating means for calculating the remainder of the calculated Julian day by providing Julian day from calendar data. The day of the week index is calculated by calculating and calculating the remainder of Julian day seven.

[0006]

With the above configuration, the day of the week index can be calculated by a common program regardless of whether the calendar data is data in the Julian calendar or data in the Gregorian calendar.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a functional block diagram of the present invention. The operation will be briefly described. First, the year,
Calendar data consisting of month and day is input from each of the data input means 2 to 4 and stored in each of the data storage means 5 to 7. The year input data is year data displayed in the Christian era, the month input data is solar calendar display data from January to December, and the day input data is data from 1 to 31 days.

[0008] These calendar data are transmitted to the calendar data discriminating means 8 and are data during the implementation of the Gregorian calendar, data during the implementation of the Julian calendar, or data during the calendar change from the Julian calendar to the Gregorian calendar. Is determined. Specifically, 15
October 5, 1982, and the next day from October 4, October 1
Whether the calendar data entered since it was enacted on the 5th is data before or after this date, or if it is data after that, if it is data before October 14 or data after Is determined.

FIG. 3 shows a detailed flowchart of the calendar data discriminating means. In the calendar data discriminating means, first, there is provided year data comparing means 20 for comparing whether year data is 1582 or not.
If it is after 1983, it is determined that the data is in the Gregorian calendar. Conversely, if it is before 1581, it is determined that the data is in the Julian calendar. Year data entered is 158
Only when it is two years, the process proceeds to the next month data comparing means 21 to determine the input month data. The month data comparing means 21 compares whether or not the input month data is October. If the month data is before September, it is determined that the data is under the Julian calendar and if it is after November, it is determined that the data is under the Gregorian calendar. You. Only when the input month data is October, the process proceeds to the next day data comparison means 22 to determine the input day data.

The day data comparing means 22 compares whether the input day data is data before 4 days, data from 5 days to 14 days, or data after 15 days. If the input date data is four days or earlier, it is determined that the data is under the Julian calendar, and if it is after 15 days, it is determined that the data is under the Gregorian calendar. If the data is from the 5th to the 14th, the input date data is corrected by the calendar correcting means 9 in FIG. 1 on the first day of the implementation of the Gregorian calendar, in this case, on the 15th, and is determined as the data during the implementation of the Gregorian calendar. You. When the calendar data determining means N determines which calendar the data belongs to, these data are sent to the Julian day calculation means, and the Julian day calculation in each calendar is performed. The Julian day-to-day arithmetic expression used here is a known one, and is given by Expression (1).

[0011] Julian day J = 1720994.5 + INT {30.6001 (m + 1)} + B + C + D (1) Y: year data M: month data D: day data M> 2: y = Y, m = M M = <2: y = Y-1, m = M + 12 A = INT (y / 100) Julian calendar: B = 0 Gregorian calendar: B = 2-A + INT (A / 4) C = INT (365.25 * y) Calculated by equation (1) The given Julian day represents the number of days that have elapsed since January 1, BC 4713 as the first day. Either the data during the Julian calendar or the data during the Gregorian calendar can be obtained by equation (1), so that the data for each calendar could be put on a common scale called Julian day. The Julian day calculated by the Julian day calculating means 10 is sent to the day calculating means 11. In the day calculating means 11,
The remainder of Julian day 7 is required. Here, since the remainder after dividing by 7 is obtained, a detailed flow is omitted. The remainder of Julian day 7 is directly sent to the data display means 12 as a day index.

The day of the week conversion means 13 in the data display means 12
The conversion between the day of the week index and the actual day of the week is performed. For example, on January 13, 1991, Julius day 24482
It is 69 days, and the remainder of Julian day 7 is 5. 19
Since January 13, 1991 is Sunday, the day index of 5 is made to correspond to Sunday. Hereafter, Monday is set to 6, Tuesday is set to 0, Wednesday is set to 1, Thursday is set to 2, Friday is set to 3, and Saturday is set to 4, and these correspondences are stored in the day conversion means 13 to convert the day index and the day. Can be done. The converted day-of-week data is sent to the display means 14 for actual display, and is displayed together with the calendar data on a liquid crystal display, a pointer, or the like. FIG. 4 shows a specific conversion example.

As a specific example, since January 13, 1991, 1
Julian day until July 19, the remainder of Julian day 7, and the corresponding day of the week are shown. Also, as a specific example during the calendar change from the Julian calendar to the Gregorian calendar, October 6, 1582
Indicates the day. This day was 1582 by the calendar correction means 9.
It is automatically corrected and converted on October 15, 2008. FIG. 2 shows an example of a hardware configuration diagram for realizing these day calculation means. A data input device 15 comprising external input switches and the like for inputting calendar data, a RAM 16 for storing the input data, and an arithmetic program for each means, a Julian day-of-day arithmetic expression, a day of the week exponent day conversion data, etc.
OM 17, a CPU 18 that performs calculations using data stored in the ROM 18 according to programs stored in the ROM 17, a data display device 14 that displays the calculation results on a liquid crystal display, a pointer, or the like, and a bus that exchanges data between these devices. It is constituted by a line 19.

[0014]

As described above, whether the input calendar data is data during the execution of the Julian calendar, data during the execution of the Gregorian calendar, or data during the calendar change from the Julian calendar to the Gregorian calendar A calendar data determining means for determining whether the calendar data is between the Julian calendar and the Gregorian calendar, and a calendar data correcting means for correcting the first day of the Gregorian calendar, and an arithmetic expression corresponding to each calendar. A Julian day calculating means for calculating the day of the week and a day index calculating means for calculating the remainder of the calculated Julian day 7 are added, and the program capacity is calculated by calculating the Julian day and the day index from the calendar data. An accurate day of the week can be calculated for both data during the Julian calendar and data during the Gregorian calendar without any increase. Even if the date between the calendar changes is erroneously input, the display content is corrected and displayed on the first day of the Gregorian calendar, so that an incorrect day of the week is not recognized.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 shows a hardware configuration of the present invention.

FIG. 3 is a schematic flowchart of the calendar data discriminating means of the present invention.

FIG. 4 is a diagram illustrating an example of data conversion according to the present invention.

[Explanation of symbols]

 1 Calendar data input means 8 Calendar data discriminating means 9 Calendar data correcting means 10 Julius day-of-day calculating means 11 Day index calculating means 12 Data display means

Claims (1)

(57) [Claims] 1. Calendar data input means comprising (a) year input means, month input means, day input means and storage means for temporarily storing respective data, and (b) the input calendar data is a Julian calendar. Calendar data determining means for determining whether the data is in operation, during the Gregorian calendar, or during a calendar change from the Julian calendar to the Gregorian calendar; and (c) when the calendar data is based on the Julian calendar. If the data was during the Gregorian calendar change,
Calendar data correcting means for correcting data on the first day of implementation of the Gregorian calendar, (d) Julian day calculating means for calculating Julian day using an arithmetic expression corresponding to each calendar, and (e)
An electronic device with a day display, comprising: a day index calculating unit that calculates the remainder of the calculated Julian day of day 7; and (f) a data display unit that converts the day index into a day of the week and displays the day.