JP2969973B2 - Time data comparison processor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a comparison of time data in which the lower two digits of the year of the year are represented by a year, in particular, time data accompanying history information. Time data comparison processing device suitable for the

[0002]

2. Description of the Related Art History data and the like stored in a computer are stored with time data indicating the time of occurrence of an event and the like. When necessary, processing such as arranging the history information in the order of the time indicated by the time data is performed. Will be needed.

In such a case, it is naturally necessary to identify the magnitude relationship between the time data. For this purpose, a comparison of two time data to determine the magnitude is performed as a basic process.

Here, the time data includes year, month, day, hour,
Minutes and seconds are represented by numbers arranged in this order from the highest digit. For the year, only the last two digits of the year are used to represent the year, for example, "11:00 September 29, 1991 AD 30 minutes 00
In many cases, “second” is held as time data “910929113000”.

Therefore, in order to arrange the history information in the order of the time, when identifying before and after the time, it is sufficient to identify the magnitude of the time data, and in that case, the time data is not changed.
By comparing the values as 12-digit numbers, the magnitude can be determined. Note that the length of the time data depends on the accuracy requirement.
May be up to minutes or days.

[0006]

In the case of time data of only the 1900s in the Christian era, the time data as described above can be compared as described above to identify before and after the time. However, in the year 2000, when the time data is composed in the same way as before and time data of the 1900s remains, comparison of time data of the same age does not cause inconsistency, If the time data of both ages is compared as it is, the magnitude relationship may be reversed before and after the time.

To avoid this, increasing the number of digits of the year display makes it very difficult to change the format when a large amount of history information has already been stored, and also increases the required storage capacity. there is a possibility.

An object of the present invention is to provide a time data comparing and processing apparatus capable of preserving a conventional year display format and processing time data in which the 1900s and 2000s are mixed by correctly identifying the era.

[0009]

FIG. 1 is a block diagram showing the configuration of the present invention. The figure shows the configuration of the time data comparison processing device. In the comparison of the time data 1 and 2 having a fixed number of digits using the two most significant digits as the year and using the lower two digits of the number indicating the year in the year display, It has two comparison buffers 3 and 4 and a processing unit 5, and each of the comparison buffers 3 and 4 is configured to have more digits than the digits of the time data 1 and 2.

The processing unit 5 sets two pieces of time data 1 and 2 to be compared in the lower digits of each of the comparison buffers 3 and 4, respectively, and sets the time data for each of the comparison buffers 3 and 4. The year display value of the time data is compared with a predetermined reference value,
Based on the comparison result, a value of a digit higher than the year display in the comparison buffer is corrected to a predetermined correction value.

The correction value is determined so that a value when the value of the year display is smaller than the reference value is larger than a value when the value of the year display is not smaller than the reference value. For example, the value of the year display is smaller than the reference value. In this case, it is set to 1, and when it is not smaller than the reference value, it is set to 0.

The processing unit 5 determines the magnitude of the result of comparing the corrected contents of the comparison buffers 3 and 4 as the magnitude of the two time data.

[0013]

According to the comparison processing device of the present invention, for example, if the maximum value of the lower two digits of the year of the old 1900s, which is not included in the history information, is selected as the reference value, the year is displayed in the conventional two-digit format. However, if the year display is smaller than the reference value at the time of comparison, the time data is corrected by adding, for example, 1 to the upper position of the time data to make the time data larger than the time data having the year display larger than the reference value. Therefore, comparing the corrected time data, the time data of the 2000s is 1
The time data is always larger than the time data of the 900s, and the time order and the magnitude relation are maintained as in the past.

Further, according to this processing, from the end of the 1900's, an appropriate reference value, for example, 50
When the age approaches 50 years, the processing can be continued without inconsistency by merely changing the reference value to, for example, 0.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Assuming that the 12-digit time data of the above example is compared, each of the comparison buffers 3 and 4 has a 7-byte length that is 1 byte longer than 6 bytes of the time data. The reference value is set to 50.

FIG. 2 is a diagram showing an example of the processing flow of the processing unit 5 of the present invention. First, in the processing step 10, the comparison buffers 3 and 4 (hereinafter, buffers A and B) are reset to 0. .

In processing step 11, one of the time data 1 (time data A) to be compared is packed in the lower side of the buffer A and loaded. That is, the time data A is "9611302125
01 ", the contents of buffer A are" 00 96 11 30 21 2
5 01 ".

In the processing step 12, the two digits of the year of the time data A are compared with the reference value of 50, and if it is smaller than 50, "01" is set in the upper one byte of the buffer A in the processing step 13 in the processing step 13. Therefore, the contents of the buffer A do not change in the case of the above example.

Next, in processing step 14, the other time data 2 (referred to as time data B) is packed in the lower side of the buffer B and loaded. That is, the time data B is "03092910030
If "0", the contents of buffer B are "00 03 09 29 10 03
00 ".

In a processing step 15, the two digits of the year of the time data B are compared with a reference value of 50, and if it is smaller than 50, in a processing step 16, "01" is set to the upper one byte of the buffer B. Therefore, the content of buffer B in the above example is "01 03 09
29 10 03 00 ".

After the above correction processing, the buffer A and the buffer B are compared in a processing step 17 and the magnitude judgment result is output as a comparison result of the time data in a processing step 18.
Therefore, in the above example, since (buffer A) <(buffer B), (time data A)
<(Time data B) is obtained.

[0022]

As is apparent from the above description, according to the present invention, the comparison of the time data in which the last two digits of the year are represented by the year is performed, and the conventional format of the year display is preserved to 1900.
There is a remarkable effect that time data in which the age and the 2000s are mixed can be correctly identified and processed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of the present invention.

FIG. 2 is a flowchart of the process of the present invention.

[Explanation of symbols]

 1, 2 time data 3, 4 comparison buffer 5 processing unit 6 reference value 10 to 18 processing steps

Claims (2)

(57) [Claims] In a comparison of time data (1, 2) of a fixed number of digits using the upper two digits as a year and using the lower two digits of the number representing the year in the year, two comparison buffers are used. (3, 4) and a processing unit (5), each of the comparison buffers (3, 4) is configured to have a number of digits larger than the number of digits of the time data, and the processing unit (5) includes:
The two pieces of time data (1, 2) to be compared are set in the lower digits of each of the comparison buffers (3, 4), and are set for each of the comparison buffers (3, 4). The year display value of the time data is compared with a predetermined reference value (6), and a value of a digit higher than the year display in the comparison buffer is corrected to a predetermined correction value based on the comparison result. Is determined so that the value when the value of the year display is smaller than the reference value is larger than the value when the value is not smaller than the reference value, and determines the magnitude of the result of comparing the corrected contents of the comparison buffer. A time data comparison processing device configured to obtain a magnitude determination result of the two time data. 2. The time data comparison processing device according to claim 1, wherein the correction value is set to 1 when the value of the year display is smaller than the reference value, and set to 0 when the value is not smaller than the reference value.