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26 lines
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26 lines
1 KiB
Text
$PostgreSQL: pgsql/src/timezone/README,v 1.7 2008/03/21 13:23:29 momjian Exp $
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Timezone
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========
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This is a PostgreSQL adapted version of the timezone library from:
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ftp://elsie.nci.nih.gov/pub/tzcode*.tar.gz
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The code is currently synced with release 2007k. There are many cosmetic
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(and not so cosmetic) differences from the original tzcode library, but
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diffs in the upstream version should usually be propagated to our version.
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The data files under data/ are an exact copy of the latest data set from:
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ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz
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Since time zone rules change frequently in some parts of the world,
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we should endeavor to update the data files before each PostgreSQL
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release.
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At each update, we should check if time zone offsets have changed.
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Just search for the current or previous year and see what has changed.
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Sometimes a country changes its time zone offsets, for example Georgia
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in 2004. Just grepping in the zic database files for 2004 is enough to
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spot such a change. Then the files under tznames/ should be updated.
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