insert date to oracle php

inserttooracle.php

        $objarray['tgl'] = date("Y-m-d",strtotime($arraydata->ACT_TGLENTRY));

        $sql="insert into mart_dws_activity (ACT_GPART,ACT_BU_NAME,ACT_ID_ACT,ACT_JNSACT,ACT_PICTELKOM,ACT_TGLENTRY,ACT_RESULT,ACT_TLPRMH,ACT_PICCUST) values ('$gpart', '$bu_name', '$id', '$jns', '$pictelkom', to_date('$tgl','yyyy-mm-dd'), '$result', '$telprmh', '$piccust')";