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doc: clarify how TIMESTAMP WITH TIME ZONE behaves

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Mention "time zone conversion" as a way to clarify the time zone is not
stored in the database.

Reported-by: Richard Neill

Discussion: https://postgr.es/m/ddf41f033a8add84e1f28a095defafae@richardneill.org

Backpatch-through: 19
This commit is contained in:
Bruce Momjian
2026-07-21 12:06:10 -04:00
parent d9d235510e
commit 9fa107f07f
1 changed files with 7 additions and 6 deletions
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13
doc/src/sgml/datatype.sgml
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@@ -264,13 +264,13 @@
<row>
<entry><type>timestamp [ (<replaceable>p</replaceable>) ] [ without time zone ]</type></entry>
<entry></entry>
<entry>date and time (no time zone)</entry>
<entry>date and time (no time zone conversion)</entry>
</row>
<row>
<entry><type>timestamp [ (<replaceable>p</replaceable>) ] with time zone</type></entry>
<entry><type>timestamptz</type></entry>
<entry>date and time, including time zone</entry>
<entry>date and time, including time zone conversion</entry>
</row>
<row>
@@ -1768,7 +1768,7 @@ SELECT 'abc \153\154\155 \052\251\124'::bytea;
<row>
<entry><type>timestamp [ (<replaceable>p</replaceable>) ] [ without time zone ]</type></entry>
<entry>8 bytes</entry>
<entry>both date and time (no time zone)</entry>
<entry>both date and time (no time zone conversion)</entry>
<entry>4713 BC</entry>
<entry>294276 AD</entry>
<entry>1 microsecond</entry>
@@ -1776,7 +1776,7 @@ SELECT 'abc \153\154\155 \052\251\124'::bytea;
<row>
<entry><type>timestamp [ (<replaceable>p</replaceable>) ] with time zone</type></entry>
<entry>8 bytes</entry>
<entry>both date and time, with time zone</entry>
<entry>both date and time, with time zone conversion</entry>
<entry>4713 BC</entry>
<entry>294276 AD</entry>
<entry>1 microsecond</entry>
@@ -2263,8 +2263,9 @@ TIMESTAMP WITH TIME ZONE '2004-10-19 10:23:54+02'
then it is assumed to be in the time zone indicated by the system's
<xref linkend="guc-timezone"/> parameter, and is converted to UTC using the
offset for the <varname>timezone</varname> zone.
In either case, the value is stored internally as UTC, and the
originally stated or assumed time zone is not retained.
In either case, the value is stored internally as UTC. The
originally stated or assumed time zone is not retained and
<emphasis>cannot</emphasis> be retrieved later.
</para>
<para>