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-rw-r--r--doc/src/sgml/func.sgml9
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 62dd7382303..ec8451d1b9b 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -7681,6 +7681,15 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
<listitem>
<para>
In <function>to_timestamp</function> and <function>to_date</function>,
+ negative years are treated as signifying BC. If you write both a
+ negative year and an explicit <literal>BC</literal> field, you get AD
+ again. An input of year zero is treated as 1 BC.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ In <function>to_timestamp</function> and <function>to_date</function>,
the <literal>YYYY</literal> conversion has a restriction when
processing years with more than 4 digits. You must
use some non-digit character or template after <literal>YYYY</literal>,