About DateTime value shown differ 8 hours in china

[yxx]

I'm from China,I use the getXAxis.setType(Axis.Type.Date Time) to let the X axis to show point time,and use ToolTip to show the time of point. I find the value of the time of these two type are different, the value shown by tooltip is correct, the XAxis value deffers about 8 hours. I don't know why and API doesn't show something about it. In examples, the problem is also exists. So I thought maybe it relevent to the area time. 
 I hope someone can give me a anwser and a solution.Thank you for reading my question and thank you for your help!
Waiting for your response

[Shawn Quinn]

Greetings! Not sure if this is the issue you're seeing, but can you try doing the following in the HTML page that is hosting your GWT module:

    <script type="text/javascript" language="javascript">
        $(function() {
            Highcharts.setOptions({
                global: {
                    useUTC: false
                }
            });
        });
    </script>

Additional details here:

http://api.highcharts.com/highcharts#global.useUTC

Keep us posted on what you find...