Add an explicit comment about POSIX time zone names having the reverse
sign convention from everyplace else in Postgres. I don't suppose that this will stop people from being confused, but at least we can say that it's documented.
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<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.199 2007/05/03 15:05:56 neilc Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.200 2007/05/08 17:02:59 tgl Exp $ -->
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<chapter id="datatype">
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<chapter id="datatype">
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<title id="datatype-title">Data Types</title>
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<title id="datatype-title">Data Types</title>
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@ -2275,6 +2275,11 @@ January 8 04:05:06 1999 PST
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reasonableness of the zone abbreviations. For example, <literal>SET
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reasonableness of the zone abbreviations. For example, <literal>SET
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TIMEZONE TO FOOBAR0</> will work, leaving the system effectively using
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TIMEZONE TO FOOBAR0</> will work, leaving the system effectively using
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a rather peculiar abbreviation for UTC.
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a rather peculiar abbreviation for UTC.
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Another issue to keep in mind is that in POSIX time zone names,
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positive offsets are used for locations <emphasis>west</> of Greenwich.
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Everywhere else, <productname>PostgreSQL</productname> follows the
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ISO-8601 convention that positive timezone offsets are <emphasis>east</>
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of Greenwich.
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</para>
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</para>
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<para>
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<para>
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