How do I get the current timezone name in Postgres 9 3

Question

I want to get the current timezone name   What I already achieved is to get the utc offset   the timezone abbreviation via   SELECT   FROM pg timezone names WHERE abbrev   current setting  TIMEZONE     This gives me all Continent   Capital combinations for this timezone but not the exact timezone  For example I get   Europe Amsterdam Europe Berlin   The server is in Berlin and I want to get the timezone name of the server    The problem I have with CET that it is always UTC 01 00 and does not account for DST iirc

User · Answer

This may or may not help you address your problem, OP, but to get the timezone of the current server relative to UTC (UT1, technically), do:

SELECT EXTRACT(TIMEZONE FROM now())/3600.0;

The above works by extracting the UT1-relative offset in minutes, and then converting it to hours using the factor of 3600 secs/hour.

Example:

SET SESSION timezone TO 'Asia/Kabul';
SELECT EXTRACT(TIMEZONE FROM now())/3600.0;
-- output: 4.5 (as of the writing of this post)

(docs).

User · Answer

I don t think this is possible using PostgreSQL alone in the most general case  When you install PostgreSQL  you pick a time zone  I m pretty sure the default is to use the operating system s timezone  That will usually be reflected in postgresql conf as the value of the parameter  timezone   But the value ends up as  localtime   You can see this setting with the SQL statement   show timezone    But if you change the timezone in postgresql conf to something like  Europe Berlin   then show timezone  will return that value instead of  localtime     So I think your solution will involve setting  timezone  in postgresql conf to an explicit value rather than the default  localtime

User · Answer

It seems to work fine in Postgresql 9 5   SELECT current setting  TIMEZONE

User · Answer

See this answer  Source     If timezone is not specified in postgresql conf or as a server command-line option  the server attempts to use the value of the TZ environment variable as the default time zone  If TZ is not defined or is not any of the time zone names known to PostgreSQL  the server attempts to determine the operating system s default time zone by checking the behavior of the C library function localtime    The default time zone is selected as the closest match among PostgreSQL s known time zones   These rules are also used to choose the default value of log timezone  if not specified   source   This means that if you do not define a timezone  the server attempts to determine the operating system s default time zone by checking the behavior of the C library function localtime     If timezone is not specified in postgresql conf or as a server command-line option  the server attempts to use the value of the TZ environment variable as the default time zone   It seems to have the System s timezone to be set is possible indeed   Get the OS local time zone from the shell  In psql     gt     date   Z

User · Answer

You can access the timezone by the following script   SELECT   FROM pg timezone names WHERE name   current setting  TIMEZONE       current setting  TIMEZONE   will give you Continent   Capital information of settings pg timezone names The view pg timezone names provides a list of time zone names that are recognized by SET TIMEZONE  along with their associated abbreviations  UTC offsets  and  daylight-savings status  name column in a view  pg timezone names  is time zone name    output will be    name- Europe Berlin   abbrev - CET   utc offset- 01 00 00   is dst- false

[postgresql] How do I get the current timezone name in Postgres 9.3?

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