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Postgres FD Implementation
Commit 97b1ac1a authored by Tom Lane's avatar Tom Lane
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Update documentation to reflect the fact that we now know exactly what 

time zone names we support.
parent 1ad8aedb
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doc/src/sgml/datatype.sgml
View file @ 97b1ac1a
<!--
$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.146 2004/06/16 01:26:35 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.147 2004/08/10 00:55:02 tgl Exp $
-->
<chapter id="datatype">
......@@ -1668,6 +1668,11 @@ SELECT b, char_length(b) FROM test2;
</tbody>
</tgroup>
</table>
<para>
Refer to <xref linkend="datetime-appendix"> for a list of
time zone names that are recognized for input.
</para>
</sect3>
<sect3>
......@@ -1687,9 +1692,11 @@ SELECT b, char_length(b) FROM test2;
<para>
Valid input for the time stamp types consists of a concatenation
of a date and a time, followed by an optional
<literal>AD</literal> or <literal>BC</literal>, followed by an
optional time zone. Thus
of a date and a time, followed by an optional time zone,
followed by an optional <literal>AD</literal> or <literal>BC</literal>.
(Alternatively, <literal>AD</literal>/<literal>BC</literal> can appear
before the time zone, but this is not the preferred ordering.)
Thus
<programlisting>
1999-01-08 04:05:06
......@@ -1798,17 +1805,7 @@ January 8 04:05:06 1999 PST
</indexterm>
<para>
The following <acronym>SQL</acronym>-compatible functions can be
used as date or time values for the corresponding data type:
<literal>CURRENT_DATE</literal>, <literal>CURRENT_TIME</literal>,
<literal>CURRENT_TIMESTAMP</literal>, <literal>LOCALTIME</literal>,
<literal>LOCALTIMESTAMP</literal>. The latter four accept an
optional precision specification. (See also <xref
linkend="functions-datetime-current">.)
</para>
<para>
<productname>PostgreSQL</productname> also supports several
<productname>PostgreSQL</productname> supports several
special date/time input values for convenience, as shown in <xref
linkend="datatype-datetime-special-table">. The values
<literal>infinity</literal> and <literal>-infinity</literal>
......@@ -1874,6 +1871,18 @@ January 8 04:05:06 1999 PST
</tgroup>
</table>
<para>
The following <acronym>SQL</acronym>-compatible functions can also
be used to obtain the current time value for the corresponding data
type:
<literal>CURRENT_DATE</literal>, <literal>CURRENT_TIME</literal>,
<literal>CURRENT_TIMESTAMP</literal>, <literal>LOCALTIME</literal>,
<literal>LOCALTIMESTAMP</literal>. The latter four accept an
optional precision specification. (See also <xref
linkend="functions-datetime-current">.) Note however that these are
SQL functions and are <emphasis>not</> recognized as data input strings.
</para>
</sect3>
</sect2>
......@@ -1985,12 +1994,12 @@ January 8 04:05:06 1999 PST
<para>
<type>interval</type> output looks like the input format, except
that units like <literal>century</literal> or
<literal>wek</literal> are converted to years and days and that
<literal>week</literal> are converted to years and days and
<literal>ago</literal> is converted to an appropriate sign. In
ISO mode the output looks like
<programlisting>
<optional> <replaceable>quantity</> <replaceable>unit</> <optional> ... </> </> <optional> <replaceable>days</> </> <optional> <replaceable>hours</>:<replaceable>minutes</>:<replaceable>sekunden</> </optional>
<optional> <replaceable>quantity</> <replaceable>unit</> <optional> ... </> </> <optional> <replaceable>days</> </> <optional> <replaceable>hours</>:<replaceable>minutes</>:<replaceable>seconds</> </optional>
</programlisting>
</para>
......@@ -2017,19 +2026,13 @@ January 8 04:05:06 1999 PST
Time zones, and time-zone conventions, are influenced by
political decisions, not just earth geometry. Time zones around the
world became somewhat standardized during the 1900's,
but continue to be prone to arbitrary changes.
<productname>PostgreSQL</productname> uses your operating
system's underlying features to provide output time-zone
support, and these systems usually contain information for only
the time period 1902 through 2038 (corresponding to the full
range of conventional Unix system time).
<type>timestamp with time zone</type> and <type>time with time
zone</type> will use time zone
information only within that year range, and assume that times
outside that range are in <acronym>UTC</acronym>.
But since time zone support is derived from the underlying operating
system time-zone capabilities, it can handle daylight-saving time
and other special behavior.
but continue to be prone to arbitrary changes, particularly with
respect to daylight-savings rules.
<productname>PostgreSQL</productname> currently supports daylight-savings
rules over the time period 1902 through 2038 (corresponding to the full
range of conventional Unix system time). Times outside that range are
taken to be in <quote>standard time</> for the selected time zone, no
matter what part of the year they fall in.
</para>
<para>
......@@ -2044,8 +2047,8 @@ January 8 04:05:06 1999 PST
Although the <type>date</type> type
does not have an associated time zone, the
<type>time</type> type can.
Time zones in the real world can have no meaning unless
associated with a date as well as a time
Time zones in the real world have little meaning unless
associated with a date as well as a time,
since the offset may vary through the year with daylight-saving
time boundaries.
</para>
......@@ -2054,8 +2057,8 @@ January 8 04:05:06 1999 PST
<listitem>
<para>
The default time zone is specified as a constant numeric offset
from <acronym>UTC</>. It is not possible to adapt to daylight-saving
time when doing date/time arithmetic across
from <acronym>UTC</>. It is therefore not possible to adapt to
daylight-saving time when doing date/time arithmetic across
<acronym>DST</acronym> boundaries.
</para>
</listitem>
......@@ -2069,34 +2072,45 @@ January 8 04:05:06 1999 PST
recommend <emphasis>not</emphasis> using the type <type>time with
time zone</type> (though it is supported by
<productname>PostgreSQL</productname> for legacy applications and
for compatibility with other <acronym>SQL</acronym>
implementations). <productname>PostgreSQL</productname> assumes
for compliance with the <acronym>SQL</acronym> standard).
<productname>PostgreSQL</productname> assumes
your local time zone for any type containing only date or time.
</para>
<para>
All dates and times are stored internally in
<acronym>UTC</acronym>. Times are converted to local time
on the database server before being sent to the client,
hence by default are in the server time zone.
All timezone-aware dates and times are stored internally in
<acronym>UTC</acronym>. They are converted to local time
in the zone specified by the <xref linkend="guc-timezone"> configuration
parameter before being displayed to the client.
</para>
<para>
There are several ways to select the time zone used by the server:
The <xref linkend="guc-timezone"> configuration parameter can
be set in the file <filename>postgresql.conf</>, or in any of the
other standard ways described in <xref linkend="runtime-config">.
There are also several special ways to set it:
<itemizedlist>
<listitem>
<para>
The <envar>TZ</envar> environment variable on the server host
is used by the server as the default time zone, if no other is
specified.
If <varname>timezone</> is not specified in
<filename>postgresql.conf</> nor as a postmaster command-line switch,
the server attempts to use the value of the <envar>TZ</envar>
environment variable as the default time zone. If <envar>TZ</envar>
is not defined or is not any of the time zone names known to
<productname>PostgreSQL</productname>, the server attempts to
determine the operating system's default time zone by checking the
behavior of the C library function <literal>localtime()</>. The
default time zone is selected as the closest match among
<productname>PostgreSQL</productname>'s known time zones.
</para>
</listitem>
<listitem>
<para>
The <xref linkend="guc-timezone"> configuration parameter can
be set in the file <filename>postgresql.conf</>.
The <acronym>SQL</acronym> command <command>SET TIME ZONE</command>
sets the time zone for the session. This is an alternative spelling
of <command>SET TIMEZONE TO</> with a more SQL-spec-compatible syntax.
</para>
</listitem>
......@@ -2108,23 +2122,9 @@ January 8 04:05:06 1999 PST
command to the server upon connection.
</para>
</listitem>
<listitem>
<para>
The <acronym>SQL</acronym> command <command>SET TIME ZONE</command>
sets the time zone for the session.
</para>
</listitem>
</itemizedlist>
</para>
<note>
<para>
If an invalid time zone is specified, the time zone becomes
<acronym>UTC</acronym> (on most systems anyway).
</para>
</note>
<para>
Refer to <xref linkend="datetime-appendix"> for a list of
available time zones.
......
doc/src/sgml/datetime.sgml
View file @ 97b1ac1a
<!--
$PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.42 2004/08/10 00:55:03 tgl Exp $
-->
<appendix id="datetime-appendix">
......@@ -13,8 +13,7 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian
field. Each field is interpreted and either assigned a numeric
value, ignored, or rejected.
The parser contains internal lookup tables for all textual fields,
including months, days of the week, and time
zones.
including months, days of the week, and time zones.
</para>
<para>
......@@ -161,16 +160,15 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian
<para>
If BC has been specified, negate the year and add one for
internal storage. (There is no year zero in the Gregorian
calendar, so numerically 1 BC becomes year
zero.)
calendar, so numerically 1 BC becomes year zero.)
</para>
</step>
<step>
<para>
If BC was not specified, and if the year field was two digits in length, then
adjust the year to four digits. If the field is less than 70, then add 2000,
otherwise add 1900.
If BC was not specified, and if the year field was two digits in length,
then adjust the year to four digits. If the field is less than 70, then
add 2000, otherwise add 1900.
<tip>
<para>
......@@ -365,28 +363,17 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian
<indexterm>
<primary>time zone</primary>
<secondary>abbreviations</secondary>
<secondary>input abbreviations</secondary>
</indexterm>
<para>
<xref linkend="datetime-timezone-table"> shows the time zone
<xref linkend="datetime-timezone-input-table"> shows the time zone
abbreviations recognized by <productname>PostgreSQL</productname>
in date/time input values.
<productname>PostgreSQL</productname> uses internal tables
for time zone input decoding, since there is no standard
operating system interface to provide access to general,
cross-time zone information. The underlying operating system
<emphasis>is</emphasis> used to provide time zone information for
<emphasis>output</emphasis>, however.
</para>
<para>
Keep in mind also that the time zone names
recognized by <command>SET TIMEZONE</> are operating-system
dependent and may have little to do with <xref
linkend="datetime-timezone-table">. For example, some systems
recognize values like <literal>'Europe/Rome'</> in <command>SET
TIMEZONE</>.
in date/time input values. Note that these names are <emphasis>not</>
used for date/time output --- display is driven by the currently
selected <xref linkend="guc-timezone"> parameter setting. (It is
likely that future releases will make some use of <varname>timezone</>
for input as well.)
</para>
<para>
......@@ -396,8 +383,8 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian
these might differ.
</para>
<table id="datetime-timezone-table">
<title>Time Zone Abbreviations</title>
<table id="datetime-timezone-input-table">
<title>Time Zone Abbreviations for Input</title>
<tgroup cols="3">
<thead>
<row>
......@@ -963,7 +950,7 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian
</formalpara>
<table id="datetime-oztz-table">
<title>Australian Time Zone Abbreviations</title>
<title>Australian Time Zone Abbreviations for Input</title>
<tgroup cols="3">
<thead>
<row>
......@@ -997,6 +984,1272 @@ $PostgreSQL: pgsql/doc/src/sgml/datetime.sgml,v 2.41 2004/03/31 16:20:53 momjian
</tgroup>
</table>
<indexterm>
<primary>time zone</primary>
<secondary>configuration names</secondary>
</indexterm>
<para>
<xref linkend="datetime-timezone-set-table"> shows the time zone
names recognized by <productname>PostgreSQL</productname> as valid
settings for the <xref linkend="guc-timezone"> parameter. Note that
these names are conceptually as well as practically different from
the names shown in <xref linkend="datetime-timezone-input-table">:
most of these names imply a local daylight-savings time rule, whereas
the former names each represent just a fixed offset from UTC.
</para>
<para>
In many cases there are several equivalent names for the same zone.
These are listed on the same line. The table is primarily sorted
by the name of the principal city of the zone.
</para>
<table id="datetime-timezone-set-table">
<title>Time Zone Names for Setting <varname>timezone</></title>
<tgroup cols="1">
<thead>
<row>
<entry>Time Zone</entry>
</row>
</thead>
<tbody>
<row>
<entry>Africa/Abidjan</entry>
</row>
<row>
<entry>Africa/Accra</entry>
</row>
<row>
<entry>Africa/Addis_Ababa</entry>
</row>
<row>
<entry>Africa/Algiers</entry>
</row>
<row>
<entry>Africa/Asmera</entry>
</row>
<row>
<entry>Africa/Bamako</entry>
</row>
<row>
<entry>Africa/Bangui</entry>
</row>
<row>
<entry>Africa/Banjul</entry>
</row>
<row>
<entry>Africa/Bissau</entry>
</row>
<row>
<entry>Africa/Blantyre</entry>
</row>
<row>
<entry>Africa/Brazzaville</entry>
</row>
<row>
<entry>Africa/Bujumbura</entry>
</row>
<row>
<entry>Africa/Cairo Egypt</entry>
</row>
<row>
<entry>Africa/Casablanca</entry>
</row>
<row>
<entry>Africa/Ceuta</entry>
</row>
<row>
<entry>Africa/Conakry</entry>
</row>
<row>
<entry>Africa/Dakar</entry>
</row>
<row>
<entry>Africa/Dar_es_Salaam</entry>
</row>
<row>
<entry>Africa/Djibouti</entry>
</row>
<row>
<entry>Africa/Douala</entry>
</row>
<row>
<entry>Africa/El_Aaiun</entry>
</row>
<row>
<entry>Africa/Freetown</entry>
</row>
<row>
<entry>Africa/Gaborone</entry>
</row>
<row>
<entry>Africa/Harare</entry>
</row>
<row>
<entry>Africa/Johannesburg</entry>
</row>
<row>
<entry>Africa/Kampala</entry>
</row>
<row>
<entry>Africa/Khartoum</entry>
</row>
<row>
<entry>Africa/Kigali</entry>
</row>
<row>
<entry>Africa/Kinshasa</entry>
</row>
<row>
<entry>Africa/Lagos</entry>
</row>
<row>
<entry>Africa/Libreville</entry>
</row>
<row>
<entry>Africa/Lome</entry>
</row>
<row>
<entry>Africa/Luanda</entry>
</row>
<row>
<entry>Africa/Lubumbashi</entry>
</row>
<row>
<entry>Africa/Lusaka</entry>
</row>
<row>
<entry>Africa/Malabo</entry>
</row>
<row>
<entry>Africa/Maputo</entry>
</row>
<row>
<entry>Africa/Maseru</entry>
</row>
<row>
<entry>Africa/Mbabane</entry>
</row>
<row>
<entry>Africa/Mogadishu</entry>
</row>
<row>
<entry>Africa/Monrovia</entry>
</row>
<row>
<entry>Africa/Nairobi</entry>
</row>
<row>
<entry>Africa/Ndjamena</entry>
</row>
<row>
<entry>Africa/Niamey</entry>
</row>
<row>
<entry>Africa/Nouakchott</entry>
</row>
<row>
<entry>Africa/Ouagadougou</entry>
</row>
<row>
<entry>Africa/Porto-Novo</entry>
</row>
<row>
<entry>Africa/Sao_Tome</entry>
</row>
<row>
<entry>Africa/Timbuktu</entry>
</row>
<row>
<entry>Africa/Tripoli Libya</entry>
</row>
<row>
<entry>Africa/Tunis</entry>
</row>
<row>
<entry>Africa/Windhoek</entry>
</row>
<row>
<entry>America/Adak America/Atka US/Aleutian</entry>
</row>
<row>
<entry>America/Anchorage SystemV/YST9YDT US/Alaska</entry>
</row>
<row>
<entry>America/Anguilla</entry>
</row>
<row>
<entry>America/Antigua</entry>
</row>
<row>
<entry>America/Araguaina</entry>
</row>
<row>
<entry>America/Aruba</entry>
</row>
<row>
<entry>America/Asuncion</entry>
</row>
<row>
<entry>America/Bahia</entry>
</row>
<row>
<entry>America/Barbados</entry>
</row>
<row>
<entry>America/Belem</entry>
</row>
<row>
<entry>America/Belize</entry>
</row>
<row>
<entry>America/Boa_Vista</entry>
</row>
<row>
<entry>America/Bogota</entry>
</row>
<row>
<entry>America/Boise</entry>
</row>
<row>
<entry>America/Buenos_Aires</entry>
</row>
<row>
<entry>America/Cambridge_Bay</entry>
</row>
<row>
<entry>America/Campo_Grande</entry>
</row>
<row>
<entry>America/Cancun</entry>
</row>
<row>
<entry>America/Caracas</entry>
</row>
<row>
<entry>America/Catamarca</entry>
</row>
<row>
<entry>America/Cayenne</entry>
</row>
<row>
<entry>America/Cayman</entry>
</row>
<row>
<entry>America/Chicago CST6CDT SystemV/CST6CDT US/Central</entry>
</row>
<row>
<entry>America/Chihuahua</entry>
</row>
<row>
<entry>America/Cordoba America/Rosario</entry>
</row>
<row>
<entry>America/Costa_Rica</entry>
</row>
<row>
<entry>America/Cuiaba</entry>
</row>
<row>
<entry>America/Curacao</entry>
</row>
<row>
<entry>America/Danmarkshavn</entry>
</row>
<row>
<entry>America/Dawson</entry>
</row>
<row>
<entry>America/Dawson_Creek</entry>
</row>
<row>
<entry>America/Denver MST7MDT SystemV/MST7MDT US/Mountain America/Shiprock Navajo</entry>
</row>
<row>
<entry>America/Detroit US/Michigan</entry>
</row>
<row>
<entry>America/Dominica</entry>
</row>
<row>
<entry>America/Edmonton Canada/Mountain</entry>
</row>
<row>
<entry>America/Eirunepe</entry>
</row>
<row>
<entry>America/El_Salvador</entry>
</row>
<row>
<entry>America/Ensenada America/Tijuana Mexico/BajaNorte</entry>
</row>
<row>
<entry>America/Fortaleza</entry>
</row>
<row>
<entry>America/Glace_Bay</entry>
</row>
<row>
<entry>America/Godthab</entry>
</row>
<row>
<entry>America/Goose_Bay</entry>
</row>
<row>
<entry>America/Grand_Turk</entry>
</row>
<row>
<entry>America/Grenada</entry>
</row>
<row>
<entry>America/Guadeloupe</entry>
</row>
<row>
<entry>America/Guatemala</entry>
</row>
<row>
<entry>America/Guayaquil</entry>
</row>
<row>
<entry>America/Guyana</entry>
</row>
<row>
<entry>America/Halifax Canada/Atlantic SystemV/AST4ADT</entry>
</row>
<row>
<entry>America/Havana Cuba</entry>
</row>
<row>
<entry>America/Hermosillo</entry>
</row>
<row>
<entry>America/Indiana/Indianapolis America/Indianapolis America/Fort_Wayne EST SystemV/EST5 US/East-Indiana</entry>
</row>
<row>
<entry>America/Indiana/Knox America/Knox_IN US/Indiana-Starke</entry>
</row>
<row>
<entry>America/Indiana/Marengo</entry>
</row>
<row>
<entry>America/Indiana/Vevay</entry>
</row>
<row>
<entry>America/Inuvik</entry>
</row>
<row>
<entry>America/Iqaluit</entry>
</row>
<row>
<entry>America/Jamaica Jamaica</entry>
</row>
<row>
<entry>America/Jujuy</entry>
</row>
<row>
<entry>America/Juneau</entry>
</row>
<row>
<entry>America/Kentucky/Louisville America/Louisville</entry>
</row>
<row>
<entry>America/Kentucky/Monticello</entry>
</row>
<row>
<entry>America/La_Paz</entry>
</row>
<row>
<entry>America/Lima</entry>
</row>
<row>
<entry>America/Los_Angeles PST8PDT SystemV/PST8PDT US/Pacific US/Pacific-New</entry>
</row>
<row>
<entry>America/Maceio</entry>
</row>
<row>
<entry>America/Managua</entry>
</row>
<row>
<entry>America/Manaus Brazil/West</entry>
</row>
<row>
<entry>America/Martinique</entry>
</row>
<row>
<entry>America/Mazatlan Mexico/BajaSur</entry>
</row>
<row>
<entry>America/Mendoza</entry>
</row>
<row>
<entry>America/Menominee</entry>
</row>
<row>
<entry>America/Merida</entry>
</row>
<row>
<entry>America/Mexico_City Mexico/General</entry>
</row>
<row>
<entry>America/Miquelon</entry>
</row>
<row>
<entry>America/Monterrey</entry>
</row>
<row>
<entry>America/Montevideo</entry>
</row>
<row>
<entry>America/Montreal</entry>
</row>
<row>
<entry>America/Montserrat</entry>
</row>
<row>
<entry>America/Nassau</entry>
</row>
<row>
<entry>America/New_York EST5EDT SystemV/EST5EDT US/Eastern</entry>
</row>
<row>
<entry>America/Nipigon</entry>
</row>
<row>
<entry>America/Nome</entry>
</row>
<row>
<entry>America/Noronha Brazil/DeNoronha</entry>
</row>
<row>
<entry>America/North_Dakota/Center</entry>
</row>
<row>
<entry>America/Panama</entry>
</row>
<row>
<entry>America/Pangnirtung</entry>
</row>
<row>
<entry>America/Paramaribo</entry>
</row>
<row>
<entry>America/Phoenix MST SystemV/MST7 US/Arizona</entry>
</row>
<row>
<entry>America/Port-au-Prince</entry>
</row>
<row>
<entry>America/Port_of_Spain</entry>
</row>
<row>
<entry>America/Porto_Acre America/Rio_Branco Brazil/Acre</entry>
</row>
<row>
<entry>America/Porto_Velho</entry>
</row>
<row>
<entry>America/Puerto_Rico SystemV/AST4</entry>
</row>
<row>
<entry>America/Rainy_River</entry>
</row>
<row>
<entry>America/Rankin_Inlet</entry>
</row>
<row>
<entry>America/Recife</entry>
</row>
<row>
<entry>America/Regina Canada/East-Saskatchewan Canada/Saskatchewan SystemV/CST6</entry>
</row>
<row>
<entry>America/Santiago Chile/Continental</entry>
</row>
<row>
<entry>America/Santo_Domingo</entry>
</row>
<row>
<entry>America/Sao_Paulo Brazil/East</entry>
</row>
<row>
<entry>America/Scoresbysund</entry>
</row>
<row>
<entry>America/St_Johns Canada/Newfoundland</entry>
</row>
<row>
<entry>America/St_Kitts</entry>
</row>
<row>
<entry>America/St_Lucia</entry>
</row>
<row>
<entry>America/St_Thomas America/Virgin</entry>
</row>
<row>
<entry>America/St_Vincent</entry>
</row>
<row>
<entry>America/Swift_Current</entry>
</row>
<row>
<entry>America/Tegucigalpa</entry>
</row>
<row>
<entry>America/Thule</entry>
</row>
<row>
<entry>America/Thunder_Bay</entry>
</row>
<row>
<entry>America/Toronto Canada/Eastern</entry>
</row>
<row>
<entry>America/Tortola</entry>
</row>
<row>
<entry>America/Vancouver Canada/Pacific</entry>
</row>
<row>
<entry>America/Whitehorse Canada/Yukon</entry>
</row>
<row>
<entry>America/Winnipeg Canada/Central</entry>
</row>
<row>
<entry>America/Yakutat</entry>
</row>
<row>
<entry>America/Yellowknife</entry>
</row>
<row>
<entry>Antarctica/Casey</entry>
</row>
<row>
<entry>Antarctica/Davis</entry>
</row>
<row>
<entry>Antarctica/DumontDUrville</entry>
</row>
<row>
<entry>Antarctica/Mawson</entry>
</row>
<row>
<entry>Antarctica/McMurdo Antarctica/South_Pole</entry>
</row>
<row>
<entry>Antarctica/Palmer</entry>
</row>
<row>
<entry>Antarctica/Rothera</entry>
</row>
<row>
<entry>Antarctica/Syowa</entry>
</row>
<row>
<entry>Antarctica/Vostok</entry>
</row>
<row>
<entry>Asia/Aden</entry>
</row>
<row>
<entry>Asia/Almaty</entry>
</row>
<row>
<entry>Asia/Amman</entry>
</row>
<row>
<entry>Asia/Anadyr</entry>
</row>
<row>
<entry>Asia/Aqtau</entry>
</row>
<row>
<entry>Asia/Aqtobe</entry>
</row>
<row>
<entry>Asia/Ashgabat Asia/Ashkhabad</entry>
</row>
<row>
<entry>Asia/Baghdad</entry>
</row>
<row>
<entry>Asia/Bahrain</entry>
</row>
<row>
<entry>Asia/Baku</entry>
</row>
<row>
<entry>Asia/Bangkok</entry>
</row>
<row>
<entry>Asia/Beirut</entry>
</row>
<row>
<entry>Asia/Bishkek</entry>
</row>
<row>
<entry>Asia/Brunei</entry>
</row>
<row>
<entry>Asia/Calcutta</entry>
</row>
<row>
<entry>Asia/Choibalsan</entry>
</row>
<row>
<entry>Asia/Chongqing Asia/Chungking</entry>
</row>
<row>
<entry>Asia/Colombo</entry>
</row>
<row>
<entry>Asia/Dacca Asia/Dhaka</entry>
</row>
<row>
<entry>Asia/Damascus</entry>
</row>
<row>
<entry>Asia/Dili</entry>
</row>
<row>
<entry>Asia/Dubai</entry>
</row>
<row>
<entry>Asia/Dushanbe</entry>
</row>
<row>
<entry>Asia/Gaza</entry>
</row>
<row>
<entry>Asia/Harbin</entry>
</row>
<row>
<entry>Asia/Hong_Kong Hongkong</entry>
</row>
<row>
<entry>Asia/Hovd</entry>
</row>
<row>
<entry>Asia/Irkutsk</entry>
</row>
<row>
<entry>Asia/Jakarta</entry>
</row>
<row>
<entry>Asia/Jayapura</entry>
</row>
<row>
<entry>Asia/Jerusalem Asia/Tel_Aviv Israel</entry>
</row>
<row>
<entry>Asia/Kabul</entry>
</row>
<row>
<entry>Asia/Kamchatka</entry>
</row>
<row>
<entry>Asia/Karachi</entry>
</row>
<row>
<entry>Asia/Kashgar</entry>
</row>
<row>
<entry>Asia/Katmandu</entry>
</row>
<row>
<entry>Asia/Krasnoyarsk</entry>
</row>
<row>
<entry>Asia/Kuala_Lumpur</entry>
</row>
<row>
<entry>Asia/Kuching</entry>
</row>
<row>
<entry>Asia/Kuwait</entry>
</row>
<row>
<entry>Asia/Macao Asia/Macau</entry>
</row>
<row>
<entry>Asia/Magadan</entry>
</row>
<row>
<entry>Asia/Makassar Asia/Ujung_Pandang</entry>
</row>
<row>
<entry>Asia/Manila</entry>
</row>
<row>
<entry>Asia/Muscat</entry>
</row>
<row>
<entry>Asia/Nicosia Europe/Nicosia</entry>
</row>
<row>
<entry>Asia/Novosibirsk</entry>
</row>
<row>
<entry>Asia/Omsk</entry>
</row>
<row>
<entry>Asia/Oral</entry>
</row>
<row>
<entry>Asia/Phnom_Penh</entry>
</row>
<row>
<entry>Asia/Pontianak</entry>
</row>
<row>
<entry>Asia/Pyongyang</entry>
</row>
<row>
<entry>Asia/Qatar</entry>
</row>
<row>
<entry>Asia/Qyzylorda</entry>
</row>
<row>
<entry>Asia/Rangoon</entry>
</row>
<row>
<entry>Asia/Riyadh</entry>
</row>
<row>
<entry>Asia/Riyadh87 Mideast/Riyadh87</entry>
</row>
<row>
<entry>Asia/Riyadh88 Mideast/Riyadh88</entry>
</row>
<row>
<entry>Asia/Riyadh89 Mideast/Riyadh89</entry>
</row>
<row>
<entry>Asia/Saigon</entry>
</row>
<row>
<entry>Asia/Sakhalin</entry>
</row>
<row>
<entry>Asia/Samarkand</entry>
</row>
<row>
<entry>Asia/Seoul ROK</entry>
</row>
<row>
<entry>Asia/Shanghai PRC</entry>
</row>
<row>
<entry>Asia/Singapore Singapore</entry>
</row>
<row>
<entry>Asia/Taipei ROC</entry>
</row>
<row>
<entry>Asia/Tashkent</entry>
</row>
<row>
<entry>Asia/Tbilisi</entry>
</row>
<row>
<entry>Asia/Tehran Iran</entry>
</row>
<row>
<entry>Asia/Thimbu Asia/Thimphu</entry>
</row>
<row>
<entry>Asia/Tokyo Japan</entry>
</row>
<row>
<entry>Asia/Ulaanbaatar Asia/Ulan_Bator</entry>
</row>
<row>
<entry>Asia/Urumqi</entry>
</row>
<row>
<entry>Asia/Vientiane</entry>
</row>
<row>
<entry>Asia/Vladivostok</entry>
</row>
<row>
<entry>Asia/Yakutsk</entry>
</row>
<row>
<entry>Asia/Yekaterinburg</entry>
</row>
<row>
<entry>Asia/Yerevan</entry>
</row>
<row>
<entry>Atlantic/Azores</entry>
</row>
<row>
<entry>Atlantic/Bermuda</entry>
</row>
<row>
<entry>Atlantic/Canary</entry>
</row>
<row>
<entry>Atlantic/Cape_Verde</entry>
</row>
<row>
<entry>Atlantic/Faeroe</entry>
</row>
<row>
<entry>Atlantic/Madeira</entry>
</row>
<row>
<entry>Atlantic/Reykjavik Iceland</entry>
</row>
<row>
<entry>Atlantic/South_Georgia</entry>
</row>
<row>
<entry>Atlantic/St_Helena</entry>
</row>
<row>
<entry>Atlantic/Stanley</entry>
</row>
<row>
<entry>Australia/ACT Australia/Canberra Australia/NSW Australia/Sydney</entry>
</row>
<row>
<entry>Australia/Adelaide Australia/South</entry>
</row>
<row>
<entry>Australia/Brisbane Australia/Queensland</entry>
</row>
<row>
<entry>Australia/Broken_Hill Australia/Yancowinna</entry>
</row>
<row>
<entry>Australia/Darwin Australia/North</entry>
</row>
<row>
<entry>Australia/Hobart Australia/Tasmania</entry>
</row>
<row>
<entry>Australia/LHI Australia/Lord_Howe</entry>
</row>
<row>
<entry>Australia/Lindeman</entry>
</row>
<row>
<entry>Australia/Melbourne Australia/Victoria</entry>
</row>
<row>
<entry>Australia/Perth Australia/West</entry>
</row>
<row>
<entry>CET</entry>
</row>
<row>
<entry>EET</entry>
</row>
<row>
<entry>Etc/GMT+1</entry>
</row>
<row>
<entry>Etc/GMT+2</entry>
</row>
<row>
<entry>Etc/GMT+3</entry>
</row>
<row>
<entry>Etc/GMT+4</entry>
</row>
<row>
<entry>Etc/GMT+5</entry>
</row>
<row>
<entry>Etc/GMT+6</entry>
</row>
<row>
<entry>Etc/GMT+7</entry>
</row>
<row>
<entry>Etc/GMT+8</entry>
</row>
<row>
<entry>Etc/GMT+9</entry>
</row>
<row>
<entry>Etc/GMT+10</entry>
</row>
<row>
<entry>Etc/GMT+11</entry>
</row>
<row>
<entry>Etc/GMT+12</entry>
</row>
<row>
<entry>Etc/GMT-1</entry>
</row>
<row>
<entry>Etc/GMT-2</entry>
</row>
<row>
<entry>Etc/GMT-3</entry>
</row>
<row>
<entry>Etc/GMT-4</entry>
</row>
<row>
<entry>Etc/GMT-5</entry>
</row>
<row>
<entry>Etc/GMT-6</entry>
</row>
<row>
<entry>Etc/GMT-7</entry>
</row>
<row>
<entry>Etc/GMT-8</entry>
</row>
<row>
<entry>Etc/GMT-9</entry>
</row>
<row>
<entry>Etc/GMT-10</entry>
</row>
<row>
<entry>Etc/GMT-11</entry>
</row>
<row>
<entry>Etc/GMT-12</entry>
</row>
<row>
<entry>Etc/GMT-13</entry>
</row>
<row>
<entry>Etc/GMT-14</entry>
</row>
<row>
<entry>Europe/Amsterdam</entry>
</row>
<row>
<entry>Europe/Andorra</entry>
</row>
<row>
<entry>Europe/Athens</entry>
</row>
<row>
<entry>Europe/Belfast</entry>
</row>
<row>
<entry>Europe/Belgrade Europe/Ljubljana Europe/Sarajevo Europe/Skopje Europe/Zagreb</entry>
</row>
<row>
<entry>Europe/Berlin</entry>
</row>
<row>
<entry>Europe/Brussels</entry>
</row>
<row>
<entry>Europe/Bucharest</entry>
</row>
<row>
<entry>Europe/Budapest</entry>
</row>
<row>
<entry>Europe/Chisinau Europe/Tiraspol</entry>
</row>
<row>
<entry>Europe/Copenhagen</entry>
</row>
<row>
<entry>Europe/Dublin Eire</entry>
</row>
<row>
<entry>Europe/Gibraltar</entry>
</row>
<row>
<entry>Europe/Helsinki</entry>
</row>
<row>
<entry>Europe/Istanbul Asia/Istanbul Turkey</entry>
</row>
<row>
<entry>Europe/Kaliningrad</entry>
</row>
<row>
<entry>Europe/Kiev</entry>
</row>
<row>
<entry>Europe/Lisbon Portugal</entry>
</row>
<row>
<entry>Europe/London GB GB-Eire</entry>
</row>
<row>
<entry>Europe/Luxembourg</entry>
</row>
<row>
<entry>Europe/Madrid</entry>
</row>
<row>
<entry>Europe/Malta</entry>
</row>
<row>
<entry>Europe/Minsk</entry>
</row>
<row>
<entry>Europe/Monaco</entry>
</row>
<row>
<entry>Europe/Moscow W-SU</entry>
</row>
<row>
<entry>Europe/Oslo Arctic/Longyearbyen Atlantic/Jan_Mayen</entry>
</row>
<row>
<entry>Europe/Paris</entry>
</row>
<row>
<entry>Europe/Prague Europe/Bratislava</entry>
</row>
<row>
<entry>Europe/Riga</entry>
</row>
<row>
<entry>Europe/Rome Europe/San_Marino Europe/Vatican</entry>
</row>
<row>
<entry>Europe/Samara</entry>
</row>
<row>
<entry>Europe/Simferopol</entry>
</row>
<row>
<entry>Europe/Sofia</entry>
</row>
<row>
<entry>Europe/Stockholm</entry>
</row>
<row>
<entry>Europe/Tallinn</entry>
</row>
<row>
<entry>Europe/Tirane</entry>
</row>
<row>
<entry>Europe/Uzhgorod</entry>
</row>
<row>
<entry>Europe/Vaduz</entry>
</row>
<row>
<entry>Europe/Vienna</entry>
</row>
<row>
<entry>Europe/Vilnius</entry>
</row>
<row>
<entry>Europe/Warsaw Poland</entry>
</row>
<row>
<entry>Europe/Zaporozhye</entry>
</row>
<row>
<entry>Europe/Zurich</entry>
</row>
<row>
<entry>Factory</entry>
</row>
<row>
<entry>GMT GMT+0 GMT-0 GMT0 Greenwich Etc/GMT Etc/GMT+0 Etc/GMT-0 Etc/GMT0 Etc/Greenwich</entry>
</row>
<row>
<entry>Indian/Antananarivo</entry>
</row>
<row>
<entry>Indian/Chagos</entry>
</row>
<row>
<entry>Indian/Christmas</entry>
</row>
<row>
<entry>Indian/Cocos</entry>
</row>
<row>
<entry>Indian/Comoro</entry>
</row>
<row>
<entry>Indian/Kerguelen</entry>
</row>
<row>
<entry>Indian/Mahe</entry>
</row>
<row>
<entry>Indian/Maldives</entry>
</row>
<row>
<entry>Indian/Mauritius</entry>
</row>
<row>
<entry>Indian/Mayotte</entry>
</row>
<row>
<entry>Indian/Reunion</entry>
</row>
<row>
<entry>MET</entry>
</row>
<row>
<entry>Pacific/Apia</entry>
</row>
<row>
<entry>Pacific/Auckland NZ</entry>
</row>
<row>
<entry>Pacific/Chatham NZ-CHAT</entry>
</row>
<row>
<entry>Pacific/Easter Chile/EasterIsland</entry>
</row>
<row>
<entry>Pacific/Efate</entry>
</row>
<row>
<entry>Pacific/Enderbury</entry>
</row>
<row>
<entry>Pacific/Fakaofo</entry>
</row>
<row>
<entry>Pacific/Fiji</entry>
</row>
<row>
<entry>Pacific/Funafuti</entry>
</row>
<row>
<entry>Pacific/Galapagos</entry>
</row>
<row>
<entry>Pacific/Gambier SystemV/YST9</entry>
</row>
<row>
<entry>Pacific/Guadalcanal</entry>
</row>
<row>
<entry>Pacific/Guam</entry>
</row>
<row>
<entry>Pacific/Honolulu HST SystemV/HST10 US/Hawaii</entry>
</row>
<row>
<entry>Pacific/Johnston</entry>
</row>
<row>
<entry>Pacific/Kiritimati</entry>
</row>
<row>
<entry>Pacific/Kosrae</entry>
</row>
<row>
<entry>Pacific/Kwajalein Kwajalein</entry>
</row>
<row>
<entry>Pacific/Majuro</entry>
</row>
<row>
<entry>Pacific/Marquesas</entry>
</row>
<row>
<entry>Pacific/Midway</entry>
</row>
<row>
<entry>Pacific/Nauru</entry>
</row>
<row>
<entry>Pacific/Niue</entry>
</row>
<row>
<entry>Pacific/Norfolk</entry>
</row>
<row>
<entry>Pacific/Noumea</entry>
</row>
<row>
<entry>Pacific/Pago_Pago Pacific/Samoa US/Samoa</entry>
</row>
<row>
<entry>Pacific/Palau</entry>
</row>
<row>
<entry>Pacific/Pitcairn SystemV/PST8</entry>
</row>
<row>
<entry>Pacific/Ponape</entry>
</row>
<row>
<entry>Pacific/Port_Moresby</entry>
</row>
<row>
<entry>Pacific/Rarotonga</entry>
</row>
<row>
<entry>Pacific/Saipan</entry>
</row>
<row>
<entry>Pacific/Tahiti</entry>
</row>
<row>
<entry>Pacific/Tarawa</entry>
</row>
<row>
<entry>Pacific/Tongatapu</entry>
</row>
<row>
<entry>Pacific/Truk</entry>
</row>
<row>
<entry>Pacific/Wake</entry>
</row>
<row>
<entry>Pacific/Wallis</entry>
</row>
<row>
<entry>Pacific/Yap</entry>
</row>
<row>
<entry>UCT Etc/UCT</entry>
</row>
<row>
<entry>UTC Universal Zulu Etc/UTC Etc/Universal Etc/Zulu</entry>
</row>
<row>
<entry>WET</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
In addition to the names listed in the table,
<productname>PostgreSQL</productname> will accept time zone names of the
form <replaceable>STD</><replaceable>offset</> or
<replaceable>STD</><replaceable>offset</><replaceable>DST</>, where
<replaceable>STD</> is a zone abbreviation, <replaceable>offset</> is a
numeric offset in hours west from UTC, and <replaceable>DST</> is an
optional daylight-savings zone abbreviation, assumed to stand for one hour
ahead of the given offset. For example, if <literal>EST5EDT</> were not
already a recognized zone name, it would be accepted and would be
functionally equivalent to USA East Coast time. When a daylight-savings
zone name is present, it is assumed to be used according to USA time zone
rules, so this feature is of limited use outside North America.
One should also be wary that this provision can lead to
silently accepting bogus input, since there is no check on the
reasonableness of the zone abbreviations. For example,
<literal>SET TIMEZONE TO FOOBAR0</> will work, leaving the system
effectively using a rather peculiar abbreviation for GMT.
</para>
</sect1>
<sect1 id="datetime-units-history">
......
doc/src/sgml/func.sgml
View file @ 97b1ac1a
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.216 2004/08/04 21:33:40 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.217 2004/08/10 00:55:03 tgl Exp $
PostgreSQL documentation
-->
......@@ -5027,7 +5027,7 @@ EXTRACT (<replaceable>field</replaceable> FROM <replaceable>source</replaceable>
<term><literal>century</literal></term>
<listitem>
<para>
The historical definition of a century.
The century
</para>
<screen>
......@@ -5038,10 +5038,9 @@ SELECT EXTRACT(CENTURY FROM TIMESTAMP '2001-02-16 20:38:40');
</screen>
<para>
An historical century is a period of 100 years.
The first century starts at 0001-01-01 00:00:00 AD, although
they did not know at the time. This definition applies to all
Gregorian calendar countries. There is no number 0 century,
they did not know it at the time. This definition applies to all
Gregorian calendar countries. There is no century number 0,
you go from -1 to 1.
If you disagree with this, please write your complaint to:
......@@ -5049,9 +5048,9 @@ SELECT EXTRACT(CENTURY FROM TIMESTAMP '2001-02-16 20:38:40');
</para>
<para>
Compatibility: if you want the previous postgres version of century,
just divide the year by 100. Note that with this definition,
century number 0 lasts 200 years.
<productname>PostgreSQL</productname> releases before 8.0 did not
follow the conventional numbering of centuries, but just returned
the year field divided by 100.
</para>
</listitem>
</varlistentry>
......@@ -5175,7 +5174,7 @@ SELECT EXTRACT(MICROSECONDS FROM TIME '17:12:28.5');
<term><literal>millennium</literal></term>
<listitem>
<para>
The conventional historical millennium.
The millennium
</para>
<screen>
......@@ -5184,9 +5183,15 @@ SELECT EXTRACT(MILLENNIUM FROM TIMESTAMP '2001-02-16 20:38:40');
</screen>
<para>
Years in the 1900's are in the second millennium.
Years in the 1900s are in the second millennium.
The third millennium starts January 1, 2001.
</para>
<para>
<productname>PostgreSQL</productname> releases before 8.0 did not
follow the conventional numbering of millennia, but just returned
the year field divided by 1000.
</para>
</listitem>
</varlistentry>
......@@ -5481,6 +5486,11 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
In these expressions, the desired time zone <replaceable>zone</> can be
specified either as a text string (e.g., <literal>'PST'</literal>)
or as an interval (e.g., <literal>INTERVAL '-08:00'</literal>).
In the text case, the available zone names are those shown in
<xref linkend="datetime-timezone-input-table">. (It would be useful
to support the more general names shown in
<xref linkend="datetime-timezone-set-table">, but this is not yet
implemented.)
</para>
<para>
......
doc/src/sgml/ref/set.sgml
View file @ 97b1ac1a
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/set.sgml,v 1.85 2004/08/03 20:32:32 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/set.sgml,v 1.86 2004/08/10 00:55:08 tgl Exp $
PostgreSQL documentation
-->
......@@ -158,7 +158,7 @@ SELECT setseed(<replaceable>value</replaceable>);
for <literal>SET timezone TO <replaceable>value</></>. The
syntax <literal>SET TIME ZONE</literal> allows special syntax
for the time zone specification. Here are examples of valid
values (but note some are accepted only on some platforms):
values:
<variablelist>
<varlistentry>
......@@ -169,14 +169,6 @@ SELECT setseed(<replaceable>value</replaceable>);
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>'Portugal'</literal></term>
<listitem>
<para>
The time zone for Portugal.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>'Europe/Rome'</literal></term>
<listitem>
......@@ -216,7 +208,8 @@ SELECT setseed(<replaceable>value</replaceable>);
</variablelist>
See <xref linkend="datatype-datetime"> for more information
about time zones.
about time zones. Also, <xref linkend="datetime-appendix">
has a list of the recognized names for time zones.
</para>
</listitem>
</varlistentry>
......@@ -253,15 +246,16 @@ SET datestyle TO postgres, dmy;
</para>
<para>
Set the time zone for Berkeley, California, using quotes to
preserve the uppercase spelling of the time zone name:
Set the time zone for Berkeley, California:
<screen>
SET TIME ZONE 'PST8PDT';
SELECT current_timestamp AS today;
</screen>
</para>
today
-------------------------------
2003-04-29 15:02:01.218622-07
<para>
Set the time zone for Italy:
<screen>
SET TIME ZONE 'Europe/Rome';
</screen>
</para>
</refsect1>
......
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