- fix [ 1274951 ] Unable to drag rank in asset manager

- fix [ 1276449 ] 6.7.1 content invisible after edit by content manager
 - Fixed a few bugs in the new form system related to UI levels and hidden
   fields.

lib/WebGUI/Form/DateTime.pm

@@ -16,6 +16,7 @@ package WebGUI::Form::DateTime;
 
 use strict;
 use base 'WebGUI::Form::Text';
+use WebGUI::Form::Hidden;
 use WebGUI::DateTime;
 use WebGUI::International;
 use WebGUI::Session;
@@ -144,5 +145,21 @@ sub toHtml {
                         </script>';
 }
 
+#-------------------------------------------------------------------
+
+=head2 toHtmlAsHidden ( )
+
+Renders the form field to HTML as a hidden field rather than whatever field type it was supposed to be.
+
+=cut
+
+sub toHtmlAsHidden {
+        my $self = shift;
+	return WebGUI::Form::Hidden->new(
+		name=>$self->{name},
+		value=>WebGUI::DateTime::epochToSet($self->{value},1)	
+		)->toHtmlAsHidden;
+}
+
 1;