Get week of year in JavaScript like in PHP

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南方客
南方客 2020-11-22 02:38

How do I get the current weeknumber of the year, like PHP\'s date(\'W\')?

It should be the ISO-8601 week number of year, weeks starting

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  •  死守一世寂寞
    2020-11-22 02:50

    Accordily http://javascript.about.com/library/blweekyear.htm

    Date.prototype.getWeek = function() {
        var onejan = new Date(this.getFullYear(),0,1);
        var millisecsInDay = 86400000;
        return Math.ceil((((this - onejan) /millisecsInDay) + onejan.getDay()+1)/7);
    };
    

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