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Add time type conversion info to docs

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Andrew Rabert 2019-03-24 18:19:32 -04:00 committed by Daniele Varrazzo
parent 953bc66ca6
commit 3eecf34bea
1 changed files with 23 additions and 0 deletions
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doc/src/usage.rst
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@ -634,6 +634,29 @@ Of course it will not be possible to write the value of `date.max` in the
database anymore: :sql:`infinity` will be stored instead.
.. _time-handling:
Time handling
'''''''''''''
The PostgreSQL :sql:`time` and Python `~datetime.time` types are not
fully bidirectional.
Within PostgreSQL, the :sql:`time` type's maximum value of ``24:00:00`` is
treated as 24-hours later than the minimum value of ``00:00:00``.
>>> cur.execute("SELECT '24:00:00'::time - '00:00:00'::time")
>>> cur.fetchone()[0]
datetime.timedelta(days=1)
However, Python's `!time` only supports times until ``23:59:59``.
Retrieving a value of ``24:00:00`` results in a `!time` of ``00:00:00``.
>>> cur.execute("SELECT '24:00:00'::time, '00:00:00'::time")
>>> cur.fetchone()
(datetime.time(0, 0), datetime.time(0, 0))
.. _adapt-list:
Lists adaptation