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Fix to_char(), to_date(), and to_timestamp() to handle negative/BC

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century specifications just like positive/AD centuries.  Previously the
behavior was either wrong or inconsistent with positive/AD handling.

Centuries without years now always assume the first year of the century,
which is now documented.
This commit is contained in:
Bruce Momjian
2012-08-07 13:34:44 -04:00
parent fbcfa90bb8
commit ac78c4178b
4 changed files with 39 additions and 22 deletions
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doc/src/sgml/func.sgml
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@@ -5575,7 +5575,9 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
if there is a <literal>YYY</literal>, <literal>YYYY</literal> or
<literal>Y,YYY</literal> field. If <literal>CC</literal> is used with
<literal>YY</literal> or <literal>Y</literal> then the year is computed
as <literal>(CC-1)*100+YY</literal>.
as the year in the specified century. If the century is
specified but the year is not, the first year of the century
is assumed.
</para>
</listitem>