Updating data in sqlsrv

Since yesterday I have been having a very strange problem at the time and updating data in my DB. I have always been able to update data, but I can not do it with this command:

if(isset($_POST['salvarNao'])){
    $acordoo = $_POST['acordoo'];
    $dataProximaAudi = $_POST['dataProximaAudiencia'];

    $dataP = explode('-', $dataProximaAudi);
    $dataProximaAudi = $dataP[0].$dataP[1].$dataP[2];

    $sqlNao = "UPDATE [RDO].[dbo].[reclamatoria] SET acordoNAO='$acordoo', dataProximaAudiencia='$dataProximaAudi' WHERE ID='$id_reclamatoria'";
    $stmt = sqlsrv_query( $conn, $sqlNao );
}

Is there anything wrong with my code? the current date I have in the database is 1900-01-01 00:00:00 00, field datetime