Method for reformation conventional three field date formats to produce a century accumulated date

• US 5,903,895 A
• Filed: 04/29/1997
• Issued: 05/11/1999
• Est. Priority Date: 04/29/1997
• Status: Expired due to Fees

• Current Assignee: Milton R. Hoffman
• Original Assignee: Milton R. Hoffman
• Inventors: Slatin, Ronald C., Hoffman, Milton R.
• Primary Examiner(s): AMSBURY, WAYNE P
• Application Number:
  US08/840,385
• Time in Patent Office: 742 Days
• Field of Search: 707/101, 707/6
• US Class Current: 708/112
• CPC Class Codes: G06F 8/78 Methods to solve the "Year 2000" [Y2K] problem
• CPC Class Codes: Y10S 707/99936 Pattern matching access
• CPC Class Codes: Y10S 707/99942 Manipulating data structure, e.g. compression, compaction, compilation

Abstract

The present invention relates to a method for reformatting and using the existing 2 digit month field and the existing 2 digit day field in a conventional 8, 7 or 6 digit date format to accommodate new century information. The invention is particularly useful for dealing with 6 digits formats used in existing databases, for example, ASCII date formats of the form mm/dd/yy or dd/mm/yy or yy/mm/dd. The method of the present invention for encoding century information is based on numerically offsetting the range of 1 through 31 days in the day field and/or offsetting the range of 1 through 12 months in the month field. In ASCII, the constraint is the value of the largest number that can be represented in 2 digit ASCII form (i.e. 99). There can be 3 day field ranges, 1-31, 32-62, 63-93 within the range 1 through 99, and there can be 8 month field ranges, 1-12, 13-24, 25-36, 37-48, 49-60, 61-72, 73-84, 85-96. Each of the embodiments manipulate the digits in these fields to produce a century accumulated date. Thus, century may be inserted into the day field, the month field, or both the day and the month field. The century can also be extracted from the century accumulated date to produce a conventional date format.

Claims

1. A method of reformatting a conventional, three field date format having a day field, a month field, and a year field comprising the steps of:

(1) setting a variable equal to zero;

(2) decrementing a century representation from the year field by one and incrementing the variable by one when the century representation from the year field is greater than 19;

(3) repeating step (2) until the century representation equals 19;

(4) multiplying the variable by a fixed day offset to get a product;

(5) adding the product to a 2 digit day to create a 2 digit century accumulated day;

(6) truncating the 2 century representation digits of a 4 digit year to form a 2 digit year; and

(7) creating a century accumulated 6 digit date format by combining the 2 digit century accumulated day, a 2 digit month, and the 2 digit year.

2. The method of claim 1, further comprising the step of determining the century representation from a group consisting of {19,20,21}.

3. The method of claim 2 further comprising the steps of:

setting the century representation equal to 19 if the 2 digit year is greater than or equal to a predetermined parameter; and

setting the century representation equal to 20 if the 2 digit year is less than the predetermined parameter.

4. The method of claim 3, further comprising the step of concatenating the century representation with the 2 digit year of the conventional 6 digit date format to form an 8 digit date format with a 4 digit year field, a 2 digit month field, and a 2 digit day field.

5. The method of claim 1, further comprising an extracting step including the steps of:

setting the century representation equal to 19 if the 2 digit century accumulated day is less than 32;

decrementing the century accumulated day by 31, and setting the century representation equal to 20 if the 2 digit century accumulated day is greater than 31 but less than 63;

decrementing the century accumulated day by 62 and setting the century representation equal to 21 if the 2 digit century accumulated day is greater than 62;

concatenating the century representation with the 2 digit year to get a 4 digit year; and

combining the 4 digit year, the 2 digit month, and the 2 digit day to create a three field, 8 digit date format.

12. A method of claim 1, further the comprising the step of setting a day variable equal to 2 and a month variable equal to the century representation decremented by 21 if the century representation is greater than 21.

13. The method of claim 12, further comprising the step of determining the century representation from a group consisting of {19, 20, 21, 22, 23, 24, 25, 26, 27, 28}.

14. The method of claim 13, further comprising the steps of:

setting the century representation equal to 19 if the 2 digit year is greater than or equal to a predetermined parameter; and

setting the century representation equal to 20 if the 2 digit year is less than the predetermined parameter.

15. The method of claim 14, further comprising the steps of concatenating the century representation with the 2 digit year of the conventional 6 digit date format to form an 8 digit date format with a 4 digit year, a 2 digit month, and a 2 digit day.

6. A method of reformatting a conventional, three field date format having a day field, a month field, and a year field comprising the steps of:

(1) setting a variable equal to zero;

(2) decrementing a century representation from the year field by one and incrementing the variable by one when the century representation is greater than 19;

(3) repeating step (2) until the century representation equals 19;

(4) multiplying the variable by a fixed month offset to get a product;

(5) adding the product to a 2 digit century accumulated month;

(6) truncating the 2 century representation digits of a 4 digit year to form a 2 digit year; and

(7) creating a century accumulated 6 digit date format by combining the 2 digit century accumulated month, the 2 digit day, and the 2 digit year.

7. The method of claim 6 further comprising the step of determining the century representation from a group consisting of {19, 20, 21, 22, 23, 24, 25, 26}.

8. The method of claim 7, further comprising the steps of:

setting the century representation equal to 19 if the 2 digit year is greater than or equal to a predetermined parameter; and

setting the century representation equal to 20 if the 2 digit year is less than the predetermined parameter.

9. The method of claim 8, further comprising the step of concatenating the century representation with the 2 digit year of the conventional 6 digit date format to form an 8 digit date format with a 4 digit year, a 2 digit month, and a 2 digit day.

10. The method of claim 6, further comprising an extracting step including the steps of:

(1) setting the century representation equal to 19 if the 2 digit month is less than 13;

(2) decrementing the 2 digit century accumulated month by 12 and incrementing the century representation by one if the 2 digit century accumulated month is greater than 12;

(3) repeating step (2) until the century accumulated month is less than 13;

(4) concatenating the century representation with the 2 digit year to get a 4 digit year; and

(5) combining the 4 digit year, the 2 digit month, and the 2 digit day to create a three field, 8 digit date format.

11. The method of reformatting a conventional, three field date format having a day field, a month field, and a year filed comprising the steps of:

setting a day variable equal to a century representation from the year field decremented by 19 and the month variable equal to zero if the century representation is less than 22;

multiplying the day variable by a fixed day offset to get a first product;

adding the first product to a 2 digit day to create a 2 digit century accumulated day;

multiplying the month variable by a fixed month offset to get a second product;

adding the product to a 2 digit month to create a 2 digit century accumulated month;

truncating the 2 century representation digits of a 4 digit year to form a 2 digit year; and

creating a century accumulated 6 digit date format by combining the 2 digit century accumulated month, the 2 digit century accumulated day, and the 2 digit year.

16. The method of claim 11, further comprising an extracting step including the steps of:

(1) setting the century representation equal to 19 if the century accumulated day is less than 32;

(2) setting the century representation equal to 20 if the century accumulated day is greater than 31 but less than 63;

(3) setting the century representation equal to 21 if the 2 digit century accumulated day is greater than 62;

(4) decrementing the 2 digit century accumulated month by 12 and incrementing the century representation by one if the 2 digit century accumulated month is greater than 12;

(5) repeating step (4) until the 2 digit century accumulated month is less than 13;

(6) concatenating the century representation with the 2 digit year to get a 4 digit year; and

(7) combining the 4 digit year, the 2 digit month, and the 2 digit day to create a 3 field, 8 digit date format.

17. A method of reformatting a conventional, three field date format having a day field, a month field, and a year field comprising the steps of:

setting a month variable equal to a century representation decremented by 19 if a century representation is less than 27;

multiplying the month variable by a fixed day offset to get a first product;

adding the first product to a 2 digit month to create a 2 digit century accumulated month;

multiplying the day variable by a fixed day offset to get a second product; and

adding the second product to a 2 digit day to create a 2 digit century accumulated day;

truncating the 2 century representation digits of a 4 digit year to create a 2 digit year; and

creating a century accumulated 6 digit date format by combining the 2 digit century accumulated month, the 2 digit century accumulated day, and the 2 digit year.

18. The method of claim 17, further comprising the step of determining the century representation from a group consisting of {19, 20, 21, 22, 23, 24, 25, 26, 27, 28}.

19. The method of claim 18, further comprising the steps of:

setting the century representation equal to 19 if the 2 digit year is greater than or equal to a predetermined parameter; and

setting the century representation equal to 20 if the 2 digit year is less than the predetermined parameter.

20. The method of claim 19, further comprising the step of concatenating the century representation with the 2 digit year of the conventional 6 digit date format having a 2 digit year, a 2 digit month, and a 2 digit day to form an 8 digit date format with a 4 digit year, a 2 digit month, and a 2 digit day.

21. The method of claim 17, further comprising the step of setting a month variable equal to 7 and the day variable equal to the century representation decremented by 26 if the century representation is greater than 26.

22. The method of claim 17, further comprising an extracting step.

23. The method of claim 22, wherein the extracting step includes the steps of:

setting the century representation equal to 19 if the 2 digit month is less than 13;

concatenating the century representation to the 2 digit year; and

combining the 4 digit year, a 2 digit month, and a 2 digit day to create a 3 field, 8 digit date format.

24. The extraction step of claim 23, further comprising the steps of:

(1) decrementing the 2 digit century accumulated month by 12 and incrementing the century representation by one if the 2 digit century accumulated month is greater than 12; and

(2) repeating step (1) until the 2 digit century accumulated month is less than 13.

25. The extraction step of claim 24, further comprising the steps of:

(1) incrementing the century representation by one and decrementing the 2 digit century accumulated day by 31 if the 2 digit century accumulated day is greater than 31; and

(2) repeating step (1) until the 2 digit century accumulated day is less than 32.

26. A method of reformatting a conventional, three field date format having a day field, a month field, and a year field comprising the steps of:

decrementing a century representation from the year field by 19 if the century representation is less than 43;

setting a first variable equal to the integer portion of the century representation divided by 8;

setting a second variable equal to the remainder portion of the century representation divided by 8;

multiplying the first variable by 31 to get a first product;

adding a 2 digit day to the first product;

multiplying the second variable by 12 to get a second product;

adding a 2 digit month to the second product;

truncating the 2 century representation digits of a 4 digit year to crate a 2 digit year; and

creating a century accumulated 6 digit date format by combining a 2 digit century accumulated month, the 2 digit century accumulated day, and the 2 digit year.

27. The method of claim 26, further comprising the step of determining the century representation from a group consisting of {19 through 42}.

28. The method of claim 27, further comprising the steps of:

setting the century representation equal to 19 if the 2 digit year is greater than or equal to a predetermined parameter; and

setting the century representation equal to 20 if the 2 digit year is less than the predetermined parameter.

29. The method of claim 28, further comprising the step of concatenating the century representation with the 2 digit year of the conventional 6 digit date format to form an 8 digit date format with a 4 digit year field, a 2 digit month field, and a 2 digit day field.

30. The method of claim 26, further comprising an extracting step including the steps of:

(1) setting a day variable equal to zero and a month variable equal to zero;

(2) decrementing the 2 digit century accumulated day by 31 and incrementing the day variable by one if the 2 digit century accumulated day is greater than 31;

(3) repeating step (2) until the 2 digit century accumulated day is less than 32;

(4) multiplying the day variable by 8, then adding 19 and then adding the month variable;

(5) concatenating the century representation with the 2 digit year to get a 4 digit year; and

(6) combining the 4 digit year, the 2 digit month, and the 2 digit day to create a 3 field, 8 digit date format.

31. The extraction step of claim 30, further comprising the steps of:

(1) decrementing the 2 digit century accumulated month by 12 and incrementing the month variable by one if the 2 digit century accumulated month is greater than 12; and

(2) repeating step (1) until the 2 digit month is less than 13.

32. A method of reformatting a conventional, three field date format having a day field, a month field, and a year field comprising the steps of:

decrementing century representation from the year field by 19 if the century representation of a 4 digit year is less than 43;

setting a first variable equal to the integral portion of the century representation divided by 3;

setting a second variable equal to the remainder portion of the century representation divided by 3;

multiplying the second variable by 31 to get a first product;

adding a 2 digit day to the first product;

multiplying the first variable by 12 to get a second product;

adding a 2 digit month to the second product;

truncating the first 2 digits of the 4 digits year to create a 2 digit year; and

creating a century accumulated 6 digit date format by combining the 2 digit century accumulated month, the 2 digit century accumulated day, and the 2 digit year.

33. The method of claim 32, further comprising the step of determining the century representation from a group consisting of {19 through 42}.

34. The method of claim 33, further comprising the steps of:

setting the century representation equal to 19 if the 2 digit year is greater than or equal to a predetermined parameter; and

setting the century representation equal to 20 if the 2 digit year is less than the predetermined parameter.

35. The method of claim 34, further comprising the step of concatenating the century representation with the 2 digit year of the conventional 6 digit date format to form an 8 digit date format with a 4 digit year field, a 2 digit month field, and a 2 digit day field.

36. The method of claim 32, further comprising an extracting step including the steps of,

(1) setting a day variable equal to zero and a month variable equal to zero;

(2) decrementing the 2 digit century accumulated day by 31 and incrementing the day variable by one if the 2 digit century accumulated day is greater than 31;

(3) repeating step (2) until the 2 digit century accumulated day is less than 32;

(4) multiplying the day variable by 3, then adding, 19 and then adding the month variable;

(5) concatenating the century representation with the 2 digit year to get a 4 digit year; and

(6) combining the 4 digit year, the 2 digit month, and the 2 digit day to create a 3 field, 8 digit date format.

37. The extraction step of claim 32, further comprising the steps of:

(1) decrementing the 2 digit century accumulated month by 12 and incrementing the month variable by one if the 2 digit century accumulated month is greater than 12; and

(2) repeating step (1) until the 2 digit century accumulated month is less than 13.