diff --git a/reference/datetime/functions/gmmktime.xml b/reference/datetime/functions/gmmktime.xml
index 952423b455..53911dda5c 100644
--- a/reference/datetime/functions/gmmktime.xml
+++ b/reference/datetime/functions/gmmktime.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/datetime.xml, last change in rev 1.2 -->
   <refentry id="function.gmmktime">
    <refnamediv>
@@ -10,18 +10,23 @@
     <title>Description</title>
      <methodsynopsis>
       <type>int</type><methodname>gmmktime</methodname>
-      <methodparam><type>int</type><parameter>hour</parameter></methodparam>
-      <methodparam><type>int</type><parameter>minute</parameter></methodparam>
-      <methodparam><type>int</type><parameter>second</parameter></methodparam>
-      <methodparam><type>int</type><parameter>month</parameter></methodparam>
-      <methodparam><type>int</type><parameter>day</parameter></methodparam>
-      <methodparam><type>int</type><parameter>year</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>hour</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>minute</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>second</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>month</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>day</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>year</parameter></methodparam>
       <methodparam choice="opt"><type>int</type><parameter>is_dst</parameter></methodparam>
      </methodsynopsis>
     <para>
      Identical to <function>mktime</function> except the passed
      parameters represents a GMT date.
     </para>
+    <para>
+     Like <function>mktime</function>, arguments may be left out in order 
+     from right to left, with any omitted arguments being set to the
+     current corresponding GMT value.
+    </para>
    </refsect1>
   </refentry>
 
diff --git a/reference/datetime/functions/mktime.xml b/reference/datetime/functions/mktime.xml
index aaa8dfa83a..55b4e6ffd5 100644
--- a/reference/datetime/functions/mktime.xml
+++ b/reference/datetime/functions/mktime.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <!-- splitted from ./en/functions/datetime.xml, last change in rev 1.2 -->
   <refentry id="function.mktime">
    <refnamediv>
@@ -10,12 +10,12 @@
     <title>Description</title>
      <methodsynopsis>
       <type>int</type><methodname>mktime</methodname>
-      <methodparam><type>int</type><parameter>hour</parameter></methodparam>
-      <methodparam><type>int</type><parameter>minute</parameter></methodparam>
-      <methodparam><type>int</type><parameter>second</parameter></methodparam>
-      <methodparam><type>int</type><parameter>month</parameter></methodparam>
-      <methodparam><type>int</type><parameter>day</parameter></methodparam>
-      <methodparam><type>int</type><parameter>year</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>hour</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>minute</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>second</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>month</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>day</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>year</parameter></methodparam>
       <methodparam choice="opt"><type>int</type><parameter>is_dst</parameter></methodparam>
      </methodsynopsis>
     <para>