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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/y2k.sgml,v 1.13 2001/11/21 06:09:45 thomas Exp $
-->
<sect1 id="y2k">
<title>Y2K Statement</title>
<note>
<title>Author</title>
<para>
Written by Thomas Lockhart
(<email>lockhart@alumni.caltech.edu</email>)
on 1998-10-22. Updated 2000-03-31.
</para>
</note>
<para>
The <productname>PostgreSQL</productname> Global Development Group provides
the <productname>PostgreSQL</productname> software code tree as a public service,
without warranty and without liability for its behavior or performance.
However, at the time of writing:
</para>
<itemizedlist>
<listitem>
<para>
The author of this statement, a volunteer on the
<productname>PostgreSQL</productname>
support team since November, 1996, is not aware of
any problems in the <productname>PostgreSQL</productname> code base related
to time transitions around Jan 1, 2000 (Y2K).
</para>
</listitem>
<listitem>
<para>
The author of this statement is not aware of any reports of Y2K problems
uncovered in regression testing
or in other field use of recent or current versions
of <productname>PostgreSQL</productname>. We might have expected
to hear about problems if they existed, given the installed base and
the active participation of users on the support mailing lists.
</para>
</listitem>
<listitem>
<para>
To the best of the author's knowledge, the
assumptions <productname>PostgreSQL</productname>
makes about dates specified with a two-digit year
are documented in the current <citetitle>User's Guide</citetitle>
in the chapter on data types.
For two-digit years, the significant transition year is 1970, not 2000;
e.g. <literal>70-01-01</literal> is interpreted as 1970-01-01,
whereas <literal>69-01-01</literal> is interpreted as 2069-01-01.
</para>
</listitem>
<listitem>
<para>
Any Y2K problems in the underlying OS related to obtaining the
<quote>current time</quote> may propagate into apparent Y2K problems in
<productname>PostgreSQL</productname>.
</para>
</listitem>
</itemizedlist>
<para>
Refer to
<ulink url="http://www.gnu.org/software/year2000.html">The GNU Project</ulink>
and
<ulink url="http://language.perl.com/news/y2k.html">The Perl Institute</ulink>
for further discussion of Y2K issues, particularly
as it relates to open source, no fee software.
</para>
</sect1>
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