--- theme/theme.inc	2009-06-09 08:10:58.000000000 +0900
+++ theme/theme-new.inc	2009-11-11 10:32:35.000000000 +0900
@@ -383,6 +383,10 @@ function theme_date_time_ago($start_date
   $start = date_format($start_date, DATE_FORMAT_DATETIME);
   $end = date_format($end_date, DATE_FORMAT_DATETIME);
   
+  if (substr($end, -8) == "00:00:00") {
+    // it is an all day event so make the end date one day later to satisfy the 'Ongoing' condition
+    $end = date_convert(date_convert($end, DATE_DATETIME, DATE_UNIX) + 86400, DATE_UNIX, DATE_DATETIME);
+  }
   // 1) The date is entirely in the future
   if ($now < $start) {
     return t('!time from now', array('!time' => date_format_interval($start_date, $interval)));