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Fix to_char for 1 BC. Previously it returned 1 AD.

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Fix to_char(year) for BC dates.  Previously it returned one less than
the current year.

Add documentation mentioning that there is no 0 AD.
This commit is contained in:
Bruce Momjian
2004-03-30 15:53:18 +00:00
parent f2c064afcb
commit fd071bd478
4 changed files with 19 additions and 15 deletions
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8
doc/src/sgml/func.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.195 2004/03/19 19:13:26 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.196 2004/03/30 15:53:18 momjian Exp $
PostgreSQL documentation
-->
@ -5216,8 +5216,7 @@ SELECT EXTRACT(SECOND FROM TIME '17:12:28.5');
<term><literal>week</literal></term>
<listitem>
<para>
The number of
the week of the year that the day is in. By definition
The number of the week of the year that the day is in. By definition
(<acronym>ISO</acronym> 8601), the first week of a year
contains January 4 of that year. (The <acronym>ISO</acronym>-8601
week starts on Monday.) In other words, the first Thursday of
@ -5235,7 +5234,8 @@ SELECT EXTRACT(WEEK FROM TIMESTAMP '2001-02-16 20:38:40');
<term><literal>year</literal></term>
<listitem>
<para>
The year field
The year field. Keep in mind there is no <literal>0 AD</>, so subtracting
<literal>BC</> years from <literal>AD</> years should be done with care.
</para>
<screen>