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imhinesmi's profile
ian hines
ian hines
ian hines
@imhinesmi

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ian hines

@imhinesmi

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    1. Mechanical Monk‏ @mechanicalmonk1 29 Dec 2019
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      Mechanical Monk Retweeted 𝚁𝚘𝚋 𝙼𝚒𝚕𝚎𝚜

      How did the Y2K bug work? Wikipedia and other sources talk about how only the last 2 digits of the year were stored in DBs, but computers are not decimal, they don't literally store `99` or `00`. 99 would be 0b1100011. How was date represented physically such that it caused bugs?https://twitter.com/robertskmiles/status/1211259257720594432 …

      Mechanical Monk added,

      𝚁𝚘𝚋 𝙼𝚒𝚕𝚎𝚜 @robertskmiles
      It recently came to my attention that many otherwise smart and well informed people don't know that the Y2K "Millennium Bug" was a real thing, which would have caused *huge* problems if people hadn't worked hard to fix it in time
      Show this thread
      1 reply 0 retweets 1 like
    2. 𝚁𝚘𝚋 𝙼𝚒𝚕𝚎𝚜‏ @robertskmiles 29 Dec 2019
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      Replying to @mechanicalmonk1

      Probably some systems were "stringly typed", but the problem is mostly in the code that assumes the int is the last two digits. Some systems might have *kinda* kept working if you enter the date of 2001 as "101", but most interfaces wouldn't allow that, and other code may crash

      1 reply 0 retweets 3 likes
    3. Mechanical Monk‏ @mechanicalmonk1 29 Dec 2019
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      Replying to @robertskmiles

      I read the reason was that storage was expensive, that's why I don't get it. Eg. if it was about space, surely they wouldn't store dates in strings. And I can't imagine another way to represent dates in memory that overflows at decimal 100

      1 reply 0 retweets 1 like
      ian hines‏ @imhinesmi 29 Dec 2019
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      Replying to @mechanicalmonk1 @robertskmiles

      Some earlier programming languages (like COBOL) had a decimal data type, which went from 0-9 for however many digits.

      9:42 AM - 29 Dec 2019
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      • Mechanical Monk
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        1. New conversation
        2. Mechanical Monk‏ @mechanicalmonk1 29 Dec 2019
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          Replying to @imhinesmi @robertskmiles

          Hm, still sounds weird that you'd use that one for dates if you're tight on memory. But there's probably not going to be a super simple tweetable explanation, so never mind

          1 reply 0 retweets 1 like
        3. 𝚁𝚘𝚋 𝙼𝚒𝚕𝚎𝚜‏ @robertskmiles 29 Dec 2019
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          Replying to @mechanicalmonk1 @imhinesmi

          How's this: A number like 90 fits in a single byte, a number like 1990 doesn't. They could have said "Ok we'll record just the last 8 bits of the year", which would allow dates from 1792 to 2047, but then 1990 is in the db as 198, which is confusing

          1 reply 0 retweets 1 like
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