javascript - 在 Javascript 中根据周数获取日期周期的简单方法

Question

全部:

谁能给我一个简单的方法来根据周数计算开始 UTC 时间和结束 UTC 时间？例如，现在是第 29 周，从 2016-07-18(星期一)到 2016-07-24(星期日)。在本例中，我需要知道开始/结束日期以及它们的 UTC 时间

谢谢

Answer 1

结合使用“javascript calculate date from week number ”和“JavaScript - get the first day of the week from current date ”的答案，同时使用 get/set 函数的 UTC 变体，您可以得到:

function getDateOfISOWeek(w, y) {
    var simple = new Date(Date.UTC(y, 0, 1 + (w - 1) * 7));
    var dow = simple.getUTCDay();
    var ISOweekStart = simple;
    if (dow <= 4)
        ISOweekStart.setUTCDate(simple.getUTCDate() - simple.getUTCDay() + 1);
    else
        ISOweekStart.setUTCDate(simple.getUTCDate() + 8 - simple.getUTCDay());
    return ISOweekStart;
}

function getEndOfISOWeek(d) {
        var endOfISOWeek = new Date(d.getTime());
    endOfISOWeek.setUTCDate(endOfISOWeek.getUTCDate() + 6); // six days
    endOfISOWeek.setUTCHours(23);
    endOfISOWeek.setUTCMinutes(59);
    endOfISOWeek.setUTCSeconds(59);
    return endOfISOWeek;
}

var startOfWeek = getDateOfISOWeek(29,2016);
var endOfWeek = getEndOfISOWeek(startOfWeek);

console.log(startOfWeek.toUTCString(), endOfWeek.toUTCString());

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JSFiddle of above code