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$arFilter = Array(
   "ACTIVE" => "Y",
   "IBLOCK_ID" => "7",
   array(
      'LOGIC' => 'OR',
      array(
         "<=PROPERTY_DATE_BEGIN" => $DB->FormatDate($dd,"DD.MM.YYYY HH:MI:SS", "YYYY-MM-DD HH:MI:SS"),
         "PROPERTY_DATE_END" => false
      ),
      array(
         "<=PROPERTY_DATE_BEGIN" => $DB->FormatDate($dd,"DD.MM.YYYY HH:MI:SS", "YYYY-MM-DD HH:MI:SS"),
         ">=PROPERTY_DATE_END" => $DB->FormatDate($dd,"DD.MM.YYYY HH:MI:SS", "YYYY-MM-DD HH:MI:SS"),
      ),
   )   
);