Information processing unit, information processing system, method of correcting abnormality of christian calendar year in information processing unit, and computer readable record medium having christian calendar year abnormality correction program recorded therein

An information processing apparatus having a Christian calendar year/date information generating section to generate current Christian calendar year/date information in a format of two decimal digits on the basis of an internal clock, and a processing section to access said Christian calendar year/date information generating section to fetch current Christian calendar year/date information to execute, using lower-two-decimal-digits of Christian calendar year information, existing application programs that treat every two-decimal-digit Christian calendar year information as 1900s irrespective of whether a four-decimal-digit Christian calendar year information is truly 1900s, said processing section comprising:

• a standard time generating section to generate standard time in a format of four decimal digits;
• a comparison circuit to compare the standard time fetched from said standard time generating section with the Christian calendar year/date information generated by said Christian calendar year/date information generating section when in said processing section there occurs an access to said Christian calendar year information generating section by an existing application program;
• a correction circuit to process the Christian calendar year/date information from the Christian calendar year/date information generating section to represent 2000s as a correct two-decimal-digit date value, responsive to the comparing;
• and
• a gate circuit to set a result of the access to said Christian calendar year/date information generating section by said processing section based upon a result of the correction and to post said processing section to output the correct date value to the existing application program.

An information processing system comprising:

• information processing apparatuses each having a memory storage section to store data files containing Christian calendar year/date information in a format of four decimal digits, an application processing section to execute, using lower-two-decimal-digits of Christian calendar year information, existing application programs that treat every two-decimal digit Christian calendar year information as 1900s, if such information to be processed is not error data, irrespective of whether a four-decimal-digit Christian calendar year information is truly 1900s, a Christian calendar year/date information generating section to generate Christian calendar year/date information in a format of two decimal digits, a restoration processing section in communication with the application processing section to restore the four-decimal digit Christian calendar year information from the lower-two-decimal-digit Christian calendar year information, and a file access controlling section responsive to a request by said application processing section to control the storage section for reading/writing of the four-decimal digit Christian calendar year information;
• and
• a reference time posting section to fetch Christian calendar year/date information in a format of four decimal digits as reference time and to generate information on the basis of the reference time to automatically process the two-decimal-digit Christian calendar year/date information generated by the Christian calendar year/date information generating section to represent 2000s as a correct date value and to post each processing section to output the correct date value to the existing application programs;
• said file access controlling section of each information processing section including:
• a judging section to judge whether the four-decimal digit Christian calendar year/date information, which is read from the storage section and to be processed by the application processing section, represents 2000s year of Christian calendar, and to judge the read four-decimal-digit Christian calendar year information as error data if result of the judging is positive, and
• a Christian calendar year/date information output section to convert the read four-decimal-digit Christian calendar year information into the lower-two-decimal-digit Christian calendar year information, and to output the lower-two-decimal-digit Christian calendar year information to said application processing section,
• said Christian calendar year/date information output section responsive to said judging section to add an interruption information signal to the converted lower-two-decimal-digit-Christian calendar year information if the read four-decimal-digit Christian calendar year information has been judged as error data by the judging section, and to output the converted lower-two-decimal-digit Christian calendar year information with the interruption information signal to the application processing section:
• said application processing section responsive to the interruption information signal transfers the converted lower-two-decimal-digit Christian calendar year information with the interruption information signal to said restoration processing section,
• each restoration processing section to reconvert the converted lower-two-decimal digit Christian calendar year/date information to the read four-decimal-digit Christian calendar year/date information to process the read four-decimal digit Christian calendar year information to represent 2000s as a correct date value to be processed by the existing application programs, and to output the correct date value to the application processing section.

A method of correcting abnormality of Christian calendar year information in an information processing apparatus upon processing existing application software that treats every two-decimal-digit Christian calendar year information as 1900s, if such information to be processed is not error data, irrespective of whether a four-decimal-digit Christian calendar year information is truly 1900s, using a data file stored in a memory in said information processing apparatus, which contains Christian calendar year information and using lower-two-decimal-digits of Christian calendar year information, said method comprising:

• receiving a request during processing of the existing application software to read from the data file Christian calendar year information in a format of four decimal digits;
• reading from the data file the four-decimal-digit Christian calendar year information;
• judging whether the four-decimal-digit Christian calendar year information read from the data file represents 2000s year of Christian calendar and to judge the read four-decimal-digit Christian calendar year information as error data if result of the judging is positive;
• converting the four-decimal-digit Christian calendar year information into a lower-two-decimal-digit Christian calendar year information;
• adding interruption information signal to the converted lower-two-decimal-digit Christian calendar year information when the result of the judging is positive;
• outputting the converted lower-two-decimal-digit Christian calendar year information to the application processing section;
• reconverting, responsive to the interruption information signal in the converted lower-two-decimal-digit Christian calendar year information received in said application processing, the converted lower-two-decimal-digit Christian calendar year information into the four-decimal-digit Christian calendar year information read from the data file;
• and
• correcting the four-decimal-digit Christian calendar year information to represent 2000s as a correct date value to be processed by the existing application software.

A computer readable recording medium having a Christian calendar year abnormality correction program recorded therein, comprising a process of:

• processing, using lower-two-decimal-digits of Christian calendar year information, an existing application program that treats every two-decimal-digit Christian calendar year information as 1900s irrespective of whether the two-decimal-digit Christian calendar year information truly represents 1900s;
• receiving a request during processing of the existing application to read from a data file including Christian calendar year information in a format of four decimal digits;
• reading from the data file the four-decimal-digit Christian calendar year information;
• judging whether the four-decimal-digit Christian calendar year information read from the data file represent 2000s year of Christian calendar and to judge the read four-decimal-digit Christian calendar year information as error data if result of the judging is positive;
• converting the four-decimal-digit Christian calendar year information into a lower-two-decimal-digit Christian calendar year information;
• adding interruption information signal to the converted lower-two-decimal-digit Christian calendar year information when the result of the judging is positive;
• outputting the converted lower-two-decimal-digit Christian calendar year information to the application processing section;
• reconverting, responsive to the interruption information signal in the converted lower-two-decimal-digit Christian calendar year information received in said application processing, the converted lower-to-decimal-digit Christian calendar year information into the four-decimal-digit Christian calendar year information read from the data file;
• and
• correcting the four-decimal-digit Christian calendar year information to represent 2000s as a correct two-decimal-digit date value to be used by the existing application program.

A system, comprising:

• a storage section to store a data file including Christian calendar year information in a format of four decimal digits;
• a processing section to process, using lower-two-decimal-digits of Christian calendar year information, an application program that treats every two-decimal-digit Christian calendar year information as 1900s;
• a file access section in communication with the processing section and the storage section, the file access section, responsive to a request from the processing section to read the four-decimal-digit Christian calendar year information from the data file, to read the four-decimal-digit Christian calendar year information from the data file and to determine if the read four-decimal-digit Christian calendar year information represents 2000s year of Christian calendar;
• and
• a restoration processing section in communication with the processing section, the restoration section to correct a four-decimal-digit Christian calendar year information determined to represent 2000s year of Christian calendar to represent 2000s as a correct two-decimal-digit date value, and to output the correct date value to the processing section, which provides the correct date value to the application program.

An information processing apparatus that executes existing application software that treats every two-decimal-digit Christian calendar year information as 1900s, if such information to be processed is not error data, irrespective of whether a four-decimal-digit Christian calendar year information is truly 19000s, comprising:

• (a) a storage section to store data files, each containing Christian calendar year information in a format of four decimal digits;
• (b) an application processing section to execute the existing application software by using the data files and using lower two decimal digits of the Christian calendar year information in the data files;
• (c) a restoration processing section operatively connected with said application processing section, to restore the four-decimal digit Christian calendar year information from the lower-two-decimal-digit Christian calendar year information;
• and
• (d) a file access controlling section, responsive to a request by said application processing section, to control said storage section for reading/writing of the four-decimal digit Christian calendar year information;
• said file access controlling section including,
• (d-I) a judgment section to discriminate whether the four-decimal-digit Christian calendar year information, which is read from said storage section and to be processed by the application processing section, represents 2000s year of Christian calendar, and to judge the read four-decimal-digit Christian calendar year information as error data if result of the discrimination is positive, and
• (d-II) a Christian calendar year information outputting section to convert the read four-decimal-digit Christian calendar year information, into the lower-two-decimal-digit Christian calendar year information and to output the lower-two-decimal-digit Christian calendar year information to said application processing section,
• said Christian calendar year information outputting section being responsive to said judgment section to add an interruption information signal to the lower-two-decimal-digit Christian calendar year information if said read four decimal digit Christian calendar year information has been judged as error data by said judgment section, and to output said lower-two-decimal-digit Christian calendar information, which has been converted from such error-data-four-decimal-digit Christian calendar year information, along with said interruption information signal, to said application processing section;
• said application processing section responsive to said interruption information signal transferring said lower-two-decimal-digit Christian calendar year information with the interruption information signal to said restoration processing section, said restoration processing section to reconvert the converted lower-two-decimal-digit Christian calendar information into the four-decimal-digit Christian calendar year information read from the storage section, to process the read four-decimal digit Christian calendar year information to represent 2000s as a correct date value to be processed by the existing application software, and to output the correct date value to said application processing section.