有没有办法在javascript中创建一个日期对象使用年& ISO周数？ [英] Is there a way in javascript to create a date object using year & ISO week number?

问题描述

我正在尝试创建一个谷歌注释时间轴为此，我需要输入事件的日期。我唯一的信息是年份&事件的ISO周号。有没有办法在Javascript中创建一个Date对象，只需要一年&周数？我google了，但没有遇到任何可行的解决方案。

I am trying to create a google annotated timeline viz. For that I need to input the date of the event. The only information I have is the year & the ISO week number for the event. Is there a way in Javascript to create a Date object using just the year & week number? I googled it but did not come across any feasible solution.

感谢您的帮助！

推荐答案

如果1月1日在星期一，星期二，星期三或星期四，则是在01周。
如果1月1日在星期五，星期六或星期日，这是在前一年的52周或53周。

If 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01. If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous year

Date.weekofYear= function(s){
    var yw= s.split(/\D+0?/),
    weeks= 7*yw[1]-7,
    date1= new Date(yw[0], 0, 1),
    day1= date1.getDay(),
    incr= (day1> 0 && day1<5)? -1: 1;
    if(yw[2]) weeks+= (+yw[2])-1;// optional day in week

    while(date1.getDay()!= 1){
        date1.setDate(date1.getDate()+incr);
    }
    date1.setDate(date1.getDate()+weeks);
    return date1;
}

Date.weekofYear('2010-20').toLocaleDateString()
// (use UTC methods to start the weeks on Greenwich instead of local time)
/*  returned value: (String)
Monday, May 17, 2010
*/

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