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   function dst_in_action($date) 
   { 
      return intval($this->data['user_dst']); 
   } 

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// dst apply between the first sunday of April, 2 am, and last sunday of October, 1h59 am (http://www.nist.gov/public_affairs/faqs/qdaylite.htm) 

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function dst_in_action($date) 
   { 
      static $years; 

      $year = date('Y', $date); 
      $month = date('m', $date); 
      $day = date('d', $date); 
      $hour = date('His', $date); 
      if ( ($month == 03) || ($month == 10) ) 
      { 
         // März 
         if ( $month == 03 ) 
         { 
            if ( isset($years[$year]) && isset($years[$year]['f']) ) 
            { 
               $last_sunday = $years[$year]['f']; 
            } 
            else 
            { 
               $day_of_week = date('w', mktime(2, 0, 0, $month, 1, $year)); 
               $last_sunday = ($day_of_week == 0) ? 1 : 8 - $day_of_week; 
               $years[$year]['f'] = $last_sunday; 
            } 
            return ($day == $last_sunday) ? ($hour >= 020000) : ($day > $last_sunday); 
         } 

         // October 
         else 
         { 
            if ( isset($years[$year]) && isset($years[$year]['t']) ) 
            { 
               $last_sunday = $years[$year]['t']; 
            } 
            else 
            { 
               $last_sunday = 31 - date('w', mktime(2, 0, 0, $month, 31, $year)); 
               $years[$year]['t'] = $last_sunday; 
            } 
            return ($day == $last_sunday) ? ($hour < 020000) : ($day < $last_sunday); 
         } 
      } 
      else 
      { 
         return ($month > 03) && ($month < 10); 
      } 
   }