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RhodiumToad's profile
RhodiumToad
RhodiumToad
RhodiumToad
@RhodiumToad

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RhodiumToad

@RhodiumToad

Find me on IRC: #postgresql or #freebsd on http://freenode.net . (he/him)

Joined February 2019

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    1. Vik Fearing‏ @pg_xocolatl 7 Sep 2019
      • Report Tweet
      • Report NetzDG Violation

      "TIMESTAMP and TIME may also be specified as being WITH TIME ZONE, in which case every value has associated with it a time zone displacement. In comparing values of a data type WITH TIME ZONE, the value of the time zone displacement is disregarded." Well what's the point then?

      5 replies 0 retweets 0 likes
    2. RhodiumToad‏ @RhodiumToad 8 Sep 2019
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      Replying to @pg_xocolatl

      The short version is that the comparison ultimately reflects the difference in the UTC times of the values, ignoring the displacements, which does actually make sense. The long version is ... long

      2 replies 0 retweets 2 likes
    3. Dave Cramer‏ @dave_cramer 8 Sep 2019
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      Replying to @RhodiumToad @pg_xocolatl

      I'd actually like to understand the long version. Timestamps and timezones are the bane of client interface authors!

      1 reply 0 retweets 1 like
    4. RhodiumToad‏ @RhodiumToad 8 Sep 2019
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      Replying to @dave_cramer @pg_xocolatl

      The long version of how the spec defines timezones is: a "timezone" is actually just a UTC offset. There are no zone names, DST boundaries, historical zone changes etc. A timestamp with time zone is a UTC timestamp and an offset.

      1 reply 0 retweets 0 likes
    5. RhodiumToad‏ @RhodiumToad 8 Sep 2019
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      Replying to @RhodiumToad @dave_cramer @pg_xocolatl

      Further, the spec says that if a timestamp without time zone is converted to with time zone, the offset used is the session's /current/ UTC offset. If the original timestamp was the other side of a DST boundary: tough, you get the wrong answer.

      1 reply 0 retweets 0 likes
    6. RhodiumToad‏ @RhodiumToad 8 Sep 2019
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      Replying to @RhodiumToad @dave_cramer @pg_xocolatl

      Not to mention that timezones are an optional feature in the first place, so clients can't rely on them. Is it any wonder that "store everything in UTC without time zones" is the standard advice outside the @PostgreSQL world?

      1 reply 0 retweets 4 likes
    7. Dave Cramer‏ @dave_cramer 9 Sep 2019
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      Replying to @RhodiumToad @pg_xocolatl @PostgreSQL

      I'm not sure the advice should be any different in the @PostgreSQL world

      2 replies 0 retweets 0 likes
      RhodiumToad‏ @RhodiumToad 9 Sep 2019
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      Replying to @dave_cramer @pg_xocolatl @PostgreSQL

      https://wiki.postgresql.org/wiki/Don't_Do_This#Don.27t_use_timestamp_.28without_time_zone.29 …

      9:18 AM - 9 Sep 2019
      • 1 Like
      • Dave Cramer
      1 reply 0 retweets 1 like
        1. Dave Cramer‏ @dave_cramer 9 Sep 2019
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          Replying to @RhodiumToad @pg_xocolatl @PostgreSQL

          cool, thanks!

          0 replies 0 retweets 0 likes
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