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Asked: 2026-06-02T18:15:22+00:00

I’m getting a little confused by postgresql timezones i was checking the dates in

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I’m getting a little confused by postgresql timezones
i was checking the dates in some rows and i noticed the timezone -4 in them
but my actual timezone is -3
the government made changes to the daylight saving timezones and the tzdata files where changes
the system date was fine but postgres don’t notice the change until i restarted it

i tried setting it with
set TIME ZONE LOCAL
but it sill got the bad timezone -4

select extract(epoch from now()),now();
date_part     |             now              
------------------+------------------------------
 1335240339.68894 | 2012-04-24 00:05:39.68894-04
(1 fila)

but after i restarted postgresql

# select extract(epoch from now()),now();

date_part | now
—————-+——————————-

  1335240403.672 | 2012-04-24 01:06:43.672002-03
 (1 fila)

my timezone was always

 show timezone;
     TimeZone     
------------------
 America/Santiago
(1 fila)

may i need to restart postgres every time tzdata info is changed?

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1 Answer

  1. Editorial Team

    According to this FAQ entry, PostgreSQL is coming with the latest tzdata database. In order to keep it up to date, one should install minor PostgreSQL releases on a regular basis.

    It is also possible to have PostgreSQL compiled with system tzdata database support using the --with-system-tzdata configure option.

    In both cases, running server will not monitor for changes in the tzdata databases, so you’ll have to explicitly notify it via the restart.

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