diff -Naur a/date_single_day.module b/date_single_day.module
--- a/date_single_day.module	2010-05-26 23:21:05.000000000 +0300
+++ b/date_single_day.module	2010-08-24 02:35:23.037821071 +0300
@@ -59,7 +59,21 @@
         }
       }
     }
-  }  
+  } else if ($form_id == 'content_add_more_js') {
+    foreach ($form as $field_name => $field){
+        foreach (array_keys($form[$field_name]) as $key) {
+            if (is_numeric($key)) {
+                if ( isset($form[$field_name][$key]['#type']) && in_array($form[$field_name][$key]['#type'] , array('date_popup','date_combo'))){
+                    $ct_fields = content_fields(NULL, $form[$field_name][$key]['#type']);
+                    if (!empty($ct_fields[$field_name]['widget']['single_day'])) {
+                        $form[$field_name][$key]['#after_build'][] = 'date_single_day_after_build';
+                        $form[$field_name][$key]['#theme'][] = 'date_single_day_element';
+                        }
+                    }
+                }
+            }
+        }
+    }
 }
 
 /**
@@ -67,7 +81,6 @@
  */
 function date_single_day_after_build($form, &$form_state) {
   //dsm($form);
-  
   // Hide the 'To' date element. 
   // 'hidden' works; 'value' does not.
   $form['value2']['date']['#type'] = 'hidden';