I'm trying to this,
        DonutChart::create(array(
            "dataSource" => $this->dataStore($this->reportName),
            "columns" => array(
                "CLASS",
                "SECOND" => array(
                    'formatValue' => function ($value) {
                        return $value/3600;
                    },
                    "label" => "Avarage time",
                    "type" => "number",
                ),
            ),
            "colorScheme" => array(
                "#fcb33b",
                "#87b25c",
                "#48a5a9"
            )
        ));
it doesn't work. I want to casting second to hour-min format.Like this 5 hour 30 minute 25 second. FormatValue doesn't work. Anyone help me ?

