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Started by Kuperstein, Tamar (JUS)
Mon, 22 Mar 1999 00:00
Re: MOST Y2K FIXES WILL ONLY LAST A GENERATION
Author: Kuperstein, Tamar (JUS)
Date: Mon, 22 Mar 1999 00:00
Date: Mon, 22 Mar 1999 00:00
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Intersting to know that you are addressing only the gentlemen in the crowed. For a minute I thought that we are approaching the Twenty First Century! > -----Original Message----- > From: mbayer@my-dejanews.com [SMTP:mbayer@my-dejanews.com] > Sent: Friday, March 19, 1999 15:17 > To: CIPS-L@hermes.csd.unb.ca > Subject: Re: MOST Y2K FIXES WILL ONLY LAST A GENERATION > > Gentlemen: > > I am the Y2k Practice Director for Client/Server Management a Toronto > Based > Conslulting Company with many clients who have done this remediation. In > our > investigations we have learned that the OS may have problems if they are > not > fixed. > > The current UNIX operating systems does not go past 2038. MVS may have > some > problems in 204xx the number. The statements about databases is suspect > because it depends on the database management systems. If POSIX time > calls > are used it may require a significant effort. Other DBMS can range out to > the Year 3000 and beyond. > > The issue about windowing is only true if a fixed windowing technique was > used. Most companies used a sliding windowing technique which allows the > window to slide from a 50/50 to a 40 / 60 window. > > Mike Bayer > > In article <7creav$fs3$1@canopus.cc.umanitoba.ca>, > roberson@ibd.nrc.ca (Walter Roberson) wrote: > > In article <19990318.084428.24081@sol.sun.csd.unb.ca>, > > James Crooks <jcrooks@vse.ca> wrote: > > :Is this article's statement true for most Canadian Y2K remediation > > :efforts? > > > > |From: "Mark Gibbs" <mgibbs@gibbs.com> > > |MOST Y2K FIXES WILL ONLY LAST A GENERATION > > > > |The fix used to patch 80% of the worlds' computers to avert a Y2K > crisis > > |is > > |actually only a short-term remedy called "windowing." > > > > |patch is a trick that forces software to "guess" whether dates fall in > > |the > > |1900s or the 2000s; typically, lower numbers (perhaps up to 30) will > > |belong > > |to the new century, whereas higher numbers (such as 87) will belong to > > |the > > |old century. > > > > While it is true that "windowing" has been used in a number of fixes, I > > would point out that in 2038 there will be another big date crisis: in > > that year, UNIX and NT and all POSIX compliant systems run out of > > time. > > > > The ANSI C time_t is defined to be an "arithmetic type" [so it cannot > > be a structure], and POSIX defines time() to return time_t and requires > > that it be the number of seconds since the Epoch, with the Epoch > > defined as starting Jan 1 1970 UTC. There is no explicit requirement > > that time_t be signed but it is in practice. As a signed value the > > counter will overflow in 2038. (I've heard that Windows 95 runs out in > > 2035 for some reason.) On many 32 bit machines, a 32 bit long *is* the > > biggest "arithmetic type" available, so there isn't anywhere to expand > > to without breaking the standards. And there will always be legacy code > / > > systems of course. > > > > There simply isn't any defined way at present to write POSIX compliant > > code that is certain to survive the end of the Epoch -- there is no > > time64() call etc. Filesystems will need to be converted too, as 32 bit > > timestamps are what are stored on Unix filesystems -- imagine what a > mess > > that's going to be!! > > > > Michael Bayer > > -----------== Posted via Deja News, The Discussion Network ==---------- > http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
Re: MOST Y2K FIXES WILL ONLY LAST A GENERATION
Author: john_beamish
Date: Wed, 24 Mar 1999 00:00
Date: Wed, 24 Mar 1999 00:00
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In article <19990322.213618.26299@sol.sun.csd.unb.ca>, CIPS General Discussion List <CIPS-L@LISTSERV.UNB.CA> (Tamar Kuperstein) wrote: > Intersting to know that you are addressing only the gentlemen in the crowed. > For a minute I thought that we are approaching the Twenty First Century! > Tamar Since you want to nitpick, "Intersting" should be "Interesting"; "crowed" should be "crowd"; "I thought" is past tense while "we are" is present tense; "Twenty First" should be "twenty-first"; "Century" is unnecessarily capitalized; the first sentence lacks a subject and a verb though the elision of "It is" would be accepted in an informal conversation; and the second sentence should have a comma after "minute". Your sentences would have been grammatically correct if you had written "It is interesting to know that you are addressing only the gentlemen in the crowd. For a minute, I thought we were approaching the twenty-first century." Now that your mistakes have been highlighted, please take the time to pay attention to Mike's content. John Beamish former CIPS member -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
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