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diferent timezones in the same table?

From: Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>
To: pgsql-bugs(at)postgresql(dot)org
Subject: diferent timezones in the same table?
Date: 2009-09-25 14:19:41
Message-ID: 3073cc9b0909250719m1ab02b52i10b91f163d566eb7@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-bugs
Hi,

One of the tables in a client production system has several timestamp
with time zone fields, in one of those fields they store '1900-01-01
00:00:00'::timestamp with time zone where there is no valid value (a
legacy from another dbms)...

pg = 8.4.1
timezone 'America/Guayaquil'

yesterday we found that that field is getting obtained as year 1899
when investigating i find that is beign obtained as timezone GMT+5:14
as shown in this extract of data (look at the data in the other field,
is just fine but shows different info about time zone):
"""
   fecha_registro     | fecha_registro_retencion
------------------------+---------------------------
 2009-07-09 00:00:00-05 | 1899-12-31 23:46:00-05:14
 2009-07-07 00:00:00-05 | 1899-12-31 23:46:00-05:14
 2009-07-27 00:00:00-05 | 1899-12-31 23:46:00-05:14
"""

i have the data in my test env and i found that this happen when
timezone is set to 'America/Guayaquil' but not if set it to 'GMT+5'
and only with values in '1900-01-01 00:00:00', even more in the same
field all values different from that date are right:

"""
imrelevsa=# show timezone;
 TimeZone
----------
 GMT+5
(1 row)

imrelevsa=# select '1900-01-01 00:00:00'::timestamp with time zone;
      timestamptz
------------------------
 1900-01-01 00:00:00-05
(1 row)

imrelevsa=# set timezone to 'America/Guayaquil';
SET
imrelevsa=# select '1900-01-01 00:00:00'::timestamp with time zone;
        timestamptz
---------------------------
 1900-01-01 00:00:00-05:14
(1 row)
"""

is this intended? why we treat '1900-01-01 00:00:00' different?

-- 
Atentamente,
Jaime Casanova
Soporte y capacitación de PostgreSQL
Asesoría y desarrollo de sistemas
Guayaquil - Ecuador
Cel. +59387171157

Responses

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Next:From: Tom LaneDate: 2009-09-25 14:29:24
Subject: Re: diferent timezones in the same table?
Previous:From: StefanDate: 2009-09-25 08:14:55
Subject: BUG #5081: ON INSERT rule does not work correctly

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