highstock highlight weekend

highstock_PlotBandsWeekends.js

/**
* xAxis: {
*   plotBands: getPlotBandsWeekends([<timestamp>, ...])
*  },
*/
function getPlotBandsWeekends (dayList) {
    return dayList
        .filter((t) => {
            let day = (new Date(t)).getDay();
            let isWeekend = (day == 6) || (day == 0);
            return isWeekend;
        })
        .map((t) => {
            let date = new Date(t);
            date.setHours(0,0,0,0);
            let startDate = +date;
            date.setHours(23,59,59,999);
            let endData = +date;
            return {
                from: startDate,
                to: endData,
                color: 'rgba(68, 170, 213, 0.2)',
            };
        });
}