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Add mention that UTC really means UT1.

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Backpatch to 9.1.
This commit is contained in:
Bruce Momjian 2011-09-05 15:37:58 -04:00
parent 0b88af150e
commit 7cb99b2696
2 changed files with 6 additions and 2 deletions
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4
doc/src/sgml/catalogs.sgml
View File

@ -8341,7 +8341,9 @@
The view <structname>pg_timezone_names</structname> provides a list
of time zone names that are recognized by <command>SET TIMEZONE</>,
along with their associated abbreviations, UTC offsets,
and daylight-savings status.
and daylight-savings status. (Technically,
<productname>PostgreSQL</productname> uses <acronym>UT1</> rather
than UTC because leap seconds are not handled.)
Unlike the abbreviations shown in <link
linkend="view-pg-timezone-abbrevs"><structname>pg_timezone_abbrevs</structname></link>, many of these names imply a set of daylight-savings transition
date rules. Therefore, the associated information changes across local DST

4
doc/src/sgml/func.sgml
View File

@ -6898,7 +6898,9 @@ SELECT EXTRACT(SECOND FROM TIME '17:12:28.5');
<para>
The time zone offset from UTC, measured in seconds. Positive values
correspond to time zones east of UTC, negative values to
zones west of UTC.
zones west of UTC. (Technically,
<productname>PostgreSQL</productname> uses <acronym>UT1</> because
leap seconds are not handled.)
</para>
</listitem>
</varlistentry>