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0171e72d4d
this adds support for 64-bit tzdata files, which is needed to support DST calculations beyond 2038. Add a regression test case to give some minimal confidence that that really works. Heikki Linnakangas
21 lines
951 B
Text
21 lines
951 B
Text
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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