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Issue #14448: add reference to IANA timezone database; thanks to Georg/Nick suggestions
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Doc/library/datetime.rst

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@@ -1560,11 +1560,18 @@ only EST (fixed offset -5 hours), or only EDT (fixed offset -4 hours)).
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.. seealso::
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`pytz <http://pypi.python.org/pypi/pytz/>`_
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The Standard Library has no :class:`tzinfo` instances except for UTC, but
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it exists a third-party library which brings Olson timezone database to
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Python: `pytz`.
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`pytz` contains up-to-date information and its usage is recommended.
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The standard library has no :class:`tzinfo` instances except for UTC, but
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there exists a third-party library which brings the *IANA timezone
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database* (also known as the Olson database) to Python: *pytz*.
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*pytz* contains up-to-date information and its usage is recommended.
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`IANA timezone database <http://www.iana.org/time-zones>`_
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The Time Zone Database (often called tz or zoneinfo) contains code and
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data that represent the history of local time for many representative
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locations around the globe. It is updated periodically to reflect changes
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made by political bodies to time zone boundaries, UTC offsets, and
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daylight-saving rules.
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.. _datetime-timezone:

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