movie/public/plugin/c3-0.7.20/docs/js/samples/timeseries.js

var chart = c3.generate({
    data: {
        x: 'x',
//        xFormat: '%Y%m%d', // 'xFormat' can be used as custom format of 'x'
        columns: [
            ['x', '2013-01-01', '2013-01-02', '2013-01-03', '2013-01-04', '2013-01-05', '2013-01-06'],
//            ['x', '20130101', '20130102', '20130103', '20130104', '20130105', '20130106'],
            ['data1', 30, 200, 100, 400, 150, 250],
            ['data2', 130, 340, 200, 500, 250, 350]
        ]
    },
    axis: {
        x: {
            type: 'timeseries',
            tick: {
                format: '%Y-%m-%d'
            }
        }
    }
});

setTimeout(function () {
    chart.load({
        columns: [
            ['data3', 400, 500, 450, 700, 600, 500]
        ]
    });
}, 1000);