Adding note with reference to bug #22620 (and the related #22457 and #14931)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@119892 c90b9560-bf6c-de11-be94-00142212c4b1

reference/datetime/functions/gmdate.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/datetime.xml, last change in rev 1.2 -->
   <refentry id="function.gmdate">
    <refnamediv>
@@ -28,6 +28,26 @@ echo gmdate ("M d Y H:i:s", mktime (0,0,0,1,1,1998));
       </programlisting>
      </example>
     </para>
+    <note>
+     <para>
+      In the Microsoft Windows series of Operating Systems the system 
+      libraries implementing this function are broken, so 
+      <function>gmdate</function> does not support negative values 
+      for the <parameter>timestamp</parameter>. 
+      For details see bug reports:
+      <ulink url="http://bugs.php.net/bug.php?id=22620">#22620</ulink>,
+      <ulink url="http://bugs.php.net/bug.php?id=22620">#22457</ulink>,
+      and <ulink url="http://bugs.php.net/bug.php?id=22620">#14391</ulink>.
+     </para>
+     <para>
+      This problem does not occur in Unix/Linux Operating Systems, were the system 
+      libraries behave as expected.
+     </para>
+     <para>
+      PHP cannot fix broken system libraries. Contact
+      your OS vendor for a fix to this a similar problems.
+     </para>
+    </note>
     <para>
      See also <function>date</function>, <function>mktime</function>,
      <function>gmmktime</function> and <function>strftime</function>.