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Journals ACM SIGAPL APL Quote Quad Volume 20 Issue 4

What's Ahead for A.D.? Howard J. Smith, Jr. IBM Corporation 1501 California Avenue Palo Alto, CA 94304 On January 1, 2000 many applications will stop working Most utilities and properly. applications express the year as the two 10~ order digits of the full representation of the year so that dates in the new century will appear to occur before dates When this phenomenon in the old. occurred in the past humans adapted quickly, and no great dislocation occurred. is not as the Unfortunately, as adaptable human. This the computer or reasonable Finally, canonical date forms. the technique defers difficulties due to changes of years century, millennium, etc. Indefinitely. In the later, sections of the paper some thoughts on possible extensions to the leap-year The new algorithm are discussed. terms would improve precision wlthout.affecting the past or Finally, sample present. functions which support and utilize this "perpetual" calendar are given. It must be emphasized that this paper represents a solution only within the APL environment. The concept is applicable In any language or system environment, but only if it or a similar solution is adopted before If we users December 31, 1999. of APL recognize and fix the problem in our environment while the rest of the computing world Ignores it, the problem will still affect everyone# including us. paper presents one possible solution to the problem, at least in the APL environment. This solution involves replacing date fields in files and records with a pseudo-Julian day number (PJD). This number permits the analyst to use date information arithmetically to determine the day of the week, the period create lists of between dates, The PJD is easily dates, etc. converted to or from human-usable Permission to copy without fee all or part of this the copies are not made or distributed for direct copyright notice and the title of the publication is given that copying is by permission of Machinery. To copy othsmise, or to republish. permission. material is granted provided that commercial advantage, the ACM and its date appear, and notice the Association for Computing requires a fee and/or specific What’s Ahead for 2000 A.D.? APL90

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What's ahead for 2000 A.D.?

Smith Jr., Howard J.
ACM SIGAPL APL Quote Quad , Volume 20 (4)
Association for Computing Machinery – May 1, 1990

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