Chartjs2.7.3：在正确的X位置轴上设置Y数据

data: {
            labels: ['29 Oct, 18', '30 Oct, 18', '02 Nov, 18', '14 Nov, 18', '15 Nov, 18', '19 Nov, 18', '20 Nov, 18', '28 Nov, 18'],
            datasets: [{
                pointRadius: 0,
                label: 'Positive',
                lineTension: 0, 
                data: [{'x': '15 Nov, 18', 'y': 18636}],
                borderWidth: 1,
                backgroundColor: 'rgba(0, 255, 0, 0.5)', 
            },{
                pointRadius: 0,
                label: 'Negative',
                lineTension: 0, 
                data: [{'x': '29 Oct, 18', 'y': -20480}, {'x': '30 Oct, 18', 'y': -284}, {'x': '02 Nov, 18', 'y': -1625}, {'x': '14 Nov, 18', 'y': -6622}, {'x': '15 Nov, 18', 'y': -12991}, {'x': '19 Nov, 18', 'y': -1645}, {'x': '20 Nov, 18', 'y': -1230}, {'x': '28 Nov, 18', 'y': -39612}],
                borderWidth: 1,
                backgroundColor: 'rgba(255, 0, 0, 0.5)', 
            }]
        },

问题是绿色条在错误的x位置。它目前位于'29 okt'，但我将其标记为'15 nov'

如何将这些数据集设置为正确的x位置