Re: [GENERAL] Time zone specifications, abbreviations vs full names
On May 8, 2011, at 11:40 AM, Adrian Klaver wrote: > No, PST has an offset of -8. Head > desk. Thank you. -- -- Christophe Pettus x...@thebuild.com -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] Time zone specifications, abbreviations vs full names
On Sunday, May 08, 2011 10:23:44 am Christophe Pettus wrote: > Either I am exceptionally confused, or the documentation in 8.5.3 appears > to be wrong. Could someone clarify what I'm missing? > > The documentation states: "In short, this is the difference between > abbreviations and full names: abbreviations always represent a fixed > offset from UTC, whereas most of the full names imply a local > daylight-savings time rule, and so have two possible UTC offsets." "PST" > is given as a specific example of an abbreviation in this case. But it > appears that using "PST" gives you a time zone rule: > > CREATE TABLE t ( >z TIMESTAMP WITH TIME ZONE > ); > > insert into t values ( '2011-03-13 01:00 PST'::timestamptz); > insert into t values ( '2011-03-13 01:00-7'::timestamptz ); > update t set z = z + '2 hours'::interval; > > select * from t; >z > > 2011-03-13 04:00:00-07 > 2011-03-13 03:00:00-07 > (2 rows) > > -- > > But if "PST" really did imply a fixed offset, shouldn't the results be the > same? No, PST has an offset of -8. So for your initial entry you have: test(5432)aklaver=>SELECT z at time zone 'UTC' from t; timezone - 2011-03-13 09:00:00 2011-03-13 08:00:00 and after the update: test(5432)aklaver=>SELECT z at time zone 'UTC' from t; timezone - 2011-03-13 11:00:00 2011-03-13 10:00:00 > > -- > -- Christophe Pettus >x...@thebuild.com -- Adrian Klaver adrian.kla...@gmail.com -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
[GENERAL] Time zone specifications, abbreviations vs full names
Either I am exceptionally confused, or the documentation in 8.5.3 appears to be wrong. Could someone clarify what I'm missing? The documentation states: "In short, this is the difference between abbreviations and full names: abbreviations always represent a fixed offset from UTC, whereas most of the full names imply a local daylight-savings time rule, and so have two possible UTC offsets." "PST" is given as a specific example of an abbreviation in this case. But it appears that using "PST" gives you a time zone rule: CREATE TABLE t ( z TIMESTAMP WITH TIME ZONE ); insert into t values ( '2011-03-13 01:00 PST'::timestamptz); insert into t values ( '2011-03-13 01:00-7'::timestamptz ); update t set z = z + '2 hours'::interval; select * from t; z 2011-03-13 04:00:00-07 2011-03-13 03:00:00-07 (2 rows) -- But if "PST" really did imply a fixed offset, shouldn't the results be the same? -- -- Christophe Pettus x...@thebuild.com -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
