Alvaro Herrera wrote:
> Excerpts from Tom Lane's message of mar mar 15 11:42:06 -0300 2011:
> > "Kevin Grittner" <[email protected]> writes:
> > > Tom Lane <[email protected]> wrote:
> > >> Dimitri Fontaine <[email protected]> writes:
> > >>> Would it help moving toward Leap Second support, and is this
> > >>> something we want to have?
> >
> > >> IMO we don't want to have that, as it would completely bollix
> > >> datetime calculations of all kinds. You couldn't even count on
> > >> stored timestamps not changing their meaning.
> >
> > > I'm inclined to agree, but if that's the choice, should we stop
> > > claiming that we're using UTC, and instead claim UT1 support? It
> > > always seemed a little odd to me that the docs say UTC but there's
> > > no actual support for leap seconds in calculations.
> >
> > Maybe, but if the docs started talking about that, we'd have to define
> > the term every time. The number of PG users who know what UT1 is can
> > probably be counted without running out of toes.
>
> A small note somewhere visible would suffice: "these docs talk about UTC
> but they really mean UT1 because we have no leap seconds support".
Done with the attached doc patch, backpatched to 9.1.
--
Bruce Momjian <[email protected]> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
new file mode 100644
index 6d5dad3..d6baf84
*** a/doc/src/sgml/catalogs.sgml
--- b/doc/src/sgml/catalogs.sgml
***************
*** 8341,8347 ****
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.
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
--- 8341,8349 ----
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. (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
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
new file mode 100644
index 4c3e232..c03dd6c
*** a/doc/src/sgml/func.sgml
--- b/doc/src/sgml/func.sgml
*************** SELECT EXTRACT(SECOND FROM TIME '17:12:2
*** 6898,6904 ****
<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.
</para>
</listitem>
</varlistentry>
--- 6898,6906 ----
<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. (Technically,
! <productname>PostgreSQL</productname> uses <acronym>UT1</> because
! leap seconds are not handled.)
</para>
</listitem>
</varlistentry>
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