JPH04287120A - Time sequential era comparing system - Google Patents

Abstract

PURPOSE:To executes time sequential comparison without any conflict after a year (the year 2000, for example) carrying a prescribed lower digit only by preparing an era correcting program concerning the time sequential era comparing system to execute time sequential comparison using the prescribed lower digit of the era. CONSTITUTION:An era data correction part 3 is to reload a code (such as F0-F9, for example) for the prescribed lower digit of the era in a former date data part to a code smaller than this, and an era comparison part 4 provided to compare the era. With the year carrying the prescribed digit of the era as a chance, the era data correction part 3 reloads the code (F0-F9, for example) for the prescribed lower digit of the era only in the former date data part to the code smaller than it, and the era comparison part 4 takes out the code for the prescribed lower digit of the era as the object of comparison and executes the time sequential comparison in the relation of the size.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-series year comparison method that performs time-series comparison using a predetermined last digit of the year name.

0002

2. Description of the Related Art Some programs compare years, months, and dates, and the results of the comparison determine important program operations. Currently, such programs perform time series processing by using the last two digits of the Western calendar.

0003

[Problem to be solved by the invention] However, when the year 2000 arrives 10 years later, a time-series comparison is made between the old data (19XX year) and the new data created after 2000. When doing so, there is a problem in that the operation of the program is not guaranteed and the user is forced to take measures such as rewriting old data and modifying the program. To explain specifically, currently, according to the EBCDIC code table, the numbers 0 to 9 in the year number are F in the EBCDIC code.
0 to F9. Therefore, the last two digits of the year number "95" on March 26, 1995 become "F9F5", which means 200
The last two digits of the year number “00” on March 26, 2000 are “F0F0”.
”, and when the two are compared, F9F5>F0F0, and the time series comparison cannot be performed correctly.

[0004] The present invention uses the year code (
For example, by rewriting the code (for example, F0 to F9) to a smaller code (for example, B0 to B9) and creating a year correction program, the year in which the lower predetermined digit is carried forward (for example, 200
The purpose is to enable time-series comparisons after year 0) without contradiction.

[0005]

[Means for Solving the Problems] Means for solving the problems will be explained with reference to FIG. In FIG. 1, the year data correction section 3 rewrites the code of the lower predetermined digit of the year (for example, F0 to F9) in the date data section 7 to a smaller code.

[0006] The year comparison section 4 compares year names.

[0007]

[Operation] As shown in FIG. 1, in the present invention, when the year in which the last predetermined digit of the year is moved forward, the year data correction unit 3 changes the code ( For example, F0 to F9) is rewritten to a smaller code, and the year comparison unit 4 extracts the code of the last predetermined digit of the year to be compared and performs a time series comparison based on the magnitude relationship.

[0008] Therefore, even after the year in which the last predetermined digit of the year number has been moved forward (for example, 2000), it is not possible to correctly perform time-series comparisons of the last predetermined digits of the old year name (for example, the last two digits of the year 19XX). It becomes possible. As a result, time-series comparisons starting from 2000, for example, can be performed without contradiction by simply creating a year correction program.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure and operation of an embodiment of the present invention will be explained in detail with reference to FIGS. 1 to 3. Here, 2 digits are the lower predetermined digits, and 2 digits are the year in which the lower predetermined digits are carried forward.
This will be explained below using the year 000 as an example. In FIG. 1, a computer system 1 performs various business processes, and is comprised of an era data correction unit 3, an era data comparison unit 4, which is a corresponding program 2 that performs date management, and the like. .

[0010] The year data correction unit 3 uses codes F0 to F9 (EBCDIC
code) to a smaller code (for example, B0 to B9). For example, change the EBCDIC code F0 to F9, which represents the last two digits of the year from 0 to 9, to a smaller number, for example, B0 to B9.
This will be revised in 2000. This results in
The last two digits 0 to 9 of the year in date data before 2000 will be changed to B0 to B9 in the EBCDIC code, and the last two digits 0 of the year in date data after 2000 will be changed to 0 to 9. -9 is F in EBCDIC code
It is expressed as 0 to F9.

[0011] Therefore, by using these two notations after 2000, time series comparison using the last two digits of the year name can be used as is without making any modifications to programs before 2000. The year comparison section 4 compares the last two digits of the year numbers. The database 5 stores various data including a date data section 7.

Correction target data 6 is data that manages the year using the last two digits of the Western calendar, and is corrected to the year when the year exceeds 2000 (by changing the EBCDIC code of the last two digits of the year). This is the data to which F0 to F9 are modified (to smaller values, for example, B0 to B9). The date data portion 7 is a portion of the correction target data 5 in which a date is written.

Next, the operation of the configuration shown in FIG. 1 will be explained in detail using FIGS. 2 and 3. (A) in FIG. 2 shows a flowchart for correcting the year name. In (a) of FIG. 2, S1 is
Determine whether the year 2000 has arrived. This determines whether or not the last two digits of the year number have been moved up to 2000, making it necessary to correct the last two digits. If YES, proceed to S2. If NO, S1 is repeated.

[0014] S2 changes the year field on the old database from F0 to F9 to B0 to B9. This is the date data section 7 in the old database 5 in Figure 1.
EBCDI corresponding to the last two digits of the year number 0 to 9
Change F0 to F9 of the C code to smaller values such as B0 to B9. As mentioned above, 2000
Taking advantage of the new year, the last two digits of the year in the date data section 7 of the old database 5 will be written in the EBCDIC code F0.
or F9 to B0 or B9, and this EBCDI
Now we are ready to perform time series comparison using the C code as is.

Next, using (b) of FIG. 2, a chronological comparison between old era names before 2000 and new era names after 2000 will be explained using a specific example. The date of the old year is March 26, 1995, and the date of the new year is March 26, 2001. The date data part 7 on the database 5 in both of these figures is 950326 for the old date data part and 010326 for the new date data part (S11, S13), and the old notation of the EBCDIC code of the last two digits of the year name at this time. is B9B5, and the new notation is F0F1 (S12, S14). Therefore, when comparing the sizes of the two, B9B5 in the old notation < F0F1 in the new notation (
S15), it was possible to perform a correct time series comparison.

FIG. 3 shows an example of an EBCDIC code table of the present invention. As mentioned above, this shows that in addition to the conventional codes F0 to F9, which were assigned to numbers 0 to 9, smaller codes B0 to B9 were newly assigned to the last two digits of the old year name. . Here, as stated in the figure,
The last two digits of the year 20XX, numbers 0 to 9 of the year number, are assigned EBCDIC codes F0 to F9. On the other hand, the last two digits of the year 19XX, numbers 0 to 9 of the old year name of XX, are assigned EBCDIC codes B0 to B9. With the arrival of the year 2000, these B0 to B9 changed F0 to F9 of the year numbers 0 to 9 in the date data section 7 of the old database 5 according to the flowchart in (a) of Figure 2 described above. Use when Note that B0 to B9 only need to be smaller than F0 to F9, and are just one example, and may be other codes as long as they are unused codes among the EBCDIC codes.

[0017]

[Effects of the Invention] As explained above, according to the present invention,
The code of the last specified digit of the year only in the old date data section (for example, F0 to F
9) to a smaller code (e.g. B0 to B9)
), the time series of the last specified digits of the old year (for example, the last two digits of the year 19XX) will be used even after the year in which the last specified digit of the year is moved forward (for example, 2000). Be able to make correct comparisons. As a result, it is possible to perform a time-series comparison from 2000 onwards without any inconsistency simply by creating a year correction program, and it is possible to eliminate or minimize the target module correction time, compile time, and LKED time.

[Brief explanation of the drawing]

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

FIG. 2 is an explanatory diagram of the operation of the present invention.

FIG. 3 is an example of an EBCDIC code table of the present invention.

[Explanation of symbols]

1: Computer system 2: Applicable program 3: Year data correction section 4: Year comparison section 5: Database 6: Data to be corrected 7: Date data section

Claims (2)

[Claims] Claim 1: In a time-series year comparison method that performs time-series comparison using the last predetermined digit of the year, the code (for example, F0 to F9) of the last predetermined digit of the year in the old date data section is Year data correction part that rewrites to a smaller code (3
) and an era name comparison section (4) that compares the era numbers, and when a predetermined digit of the era name moves forward, the above era data correction section (3) converts the era name of only the old date data section. The code in the lower predetermined digits (for example, F0 to F9) is rewritten to a smaller code, and the year comparison section (4) extracts the code in the lower predetermined digits of the year to be compared and compares them in chronological order based on their magnitude. A time-series year comparison method characterized by being configured to perform. 2. The time-series year comparison method according to claim 1, wherein two digits are used as the lower predetermined digits, and 2000 is set as the year in which the predetermined digit of the year number is carried forward.