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Diffstat (limited to 'doc/src/usage.rst')
| -rw-r--r-- | doc/src/usage.rst | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/doc/src/usage.rst b/doc/src/usage.rst index 3aafa90..335e750 100644 --- a/doc/src/usage.rst +++ b/doc/src/usage.rst @@ -580,25 +580,33 @@ The PostgreSQL type :sql:`timestamp with time zone` (a.k.a. a `~datetime.datetime.tzinfo` attribute set to a `~psycopg2.tz.FixedOffsetTimezone` instance. - >>> cur.execute("SET TIME ZONE 'Europe/Rome';") # UTC + 1 hour - >>> cur.execute("SELECT '2010-01-01 10:30:45'::timestamptz;") + >>> cur.execute("SET TIME ZONE 'Europe/Rome'") # UTC + 1 hour + >>> cur.execute("SELECT '2010-01-01 10:30:45'::timestamptz") >>> cur.fetchone()[0].tzinfo psycopg2.tz.FixedOffsetTimezone(offset=60, name=None) -Note that only time zones with an integer number of minutes are supported: -this is a limitation of the Python `datetime` module. A few historical time -zones had seconds in the UTC offset: these time zones will have the offset -rounded to the nearest minute, with an error of up to 30 seconds. +.. note:: - >>> cur.execute("SET TIME ZONE 'Asia/Calcutta';") # offset was +5:53:20 - >>> cur.execute("SELECT '1930-01-01 10:30:45'::timestamptz;") - >>> cur.fetchone()[0].tzinfo - psycopg2.tz.FixedOffsetTimezone(offset=353, name=None) + Before Python 3.7, the `datetime` module only supported timezones with an + integer number of minutes. A few historical time zones had seconds in the + UTC offset: these time zones will have the offset rounded to the nearest + minute, with an error of up to 30 seconds, on Python versions before 3.7. + + >>> cur.execute("SET TIME ZONE 'Asia/Calcutta'") # offset was +5:21:10 + >>> cur.execute("SELECT '1900-01-01 10:30:45'::timestamptz") + >>> cur.fetchone()[0].tzinfo + # On Python 3.6: 5h, 21m + psycopg2.tz.FixedOffsetTimezone(offset=datetime.timedelta(0, 19260), name=None) + # On Python 3.7 and following: 5h, 21m, 10s + psycopg2.tz.FixedOffsetTimezone(offset=datetime.timedelta(seconds=19270), name=None) .. versionchanged:: 2.2.2 timezones with seconds are supported (with rounding). Previously such timezones raised an error. +.. versionchanged:: 2.9 + timezones with seconds are supported without rounding. + .. index:: double: Date objects; Infinite |