使用JavaScript点表示法时出错

Question

I get Uncaught TypeError: undefined is not a function at the date line. Removing .setHours(this.getHours()-6) it runs just fine but I need to offset for timezone purposed. In this case CST or -6 hours. I believe I am misusing dot notation. As a note AmCharts.stringToDate( is returning a Date object.

var lineChartData = [
    {
        date: AmCharts.stringToDate("2014-04-18 13:44:39", "YYYY-MM-DD JJ:NN:SS").setHours(this.getHours()-6),
        ambUp: 67.21,
        ambDown: 62.83,
        ext: 47.75,
        in: 44.15,
        out: 44.38,
        freeze: 23.45,
        fridge: 46.29,
        diff: 2.14,
        diff2: 0.2250 
    },
];

Answer 1

Seems like this is not what you think it is. There is no special scope in properties like that, you should use an extra variable to reference the date twice

var date = AmCharts.stringToDate("2014-04-18 13:44:39", "YYYY-MM-DD JJ:NN:SS");
date.setHours(date.getHours() - 6);

var lineChartData = [{
    date: date,
    ambUp: 67.21,
    ambDown: 62.83,
    ext: 47.75,
    in : 44.15,
    out: 44.38,
    freeze: 23.45,
    fridge: 46.29,
    diff: 2.14,
    diff2: 0.2250
}];