javascript从周数计算日期 [英] javascript calculate date from week number

问题描述

我如何计算javascript知道周数和年份的日期？对于第20周和第2013年，获得5/16/2013
我这样做：

How i can calculate the date in javascript knowing weeknumber and the year? For week number 20 and year 2013 to obtain 5/16/2013 I am trying so:

Date.prototype.dayofYear = function() {        
    var d = new Date(this.getFullYear(), 0, 0);        
    return Math.floor((enter code here this - d) / 8.64e + 7); 
}

推荐答案

function getDateOfWeek(w, y) {
    var d = (1 + (w - 1) * 7); // 1st of January + 7 days for each week

    return new Date(y, 0, d);
}

这使用简单的周定义，意味着2013年的第20周是5月14日。

This uses the simple week definition, meaning the 20th week of 2013 is May 14.

要计算给定 ISO8601周（始终为星期一）的开始日期

To calculate the date of the start of a given ISO8601 week (which will always be a Monday)

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

结果：2013年第20周是5月13日，可以确认< a href =http://www.epochconverter.com/date-and-time/weeknumbers-by-year.php?year=2013​​rel =noreferrer>这里。

Result: the 20th week of 2013 is May 13, which can be confirmed here.

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