每月通过Javascript获取周 [英] Get Weeks In Month Through Javascript

问题描述

在Javascript中，如何获取一个月的周数？我似乎找不到这个任何地方的代码。

In Javascript, how do I get the number of weeks in a month? I can't seem to find code for this anywhere.

我需要这个能够知道一个给定月份需要多少行。

I need this to be able to know how many rows I need for a given month.

更具体地说，我想要在一周中至少有一天的周数（一周定义为从星期日开始，到星期六结束）。

To be more specific, I would like the number of weeks that have at least one day in the week (a week being defined as starting on Sunday and ending on Saturday).

所以，对于这样的东西，我想知道它有5个星期：

So, for something like this, I would want to know it has 5 weeks:

S  M  T  W  R  F  S

         1  2  3  4

5  6  7  8  9  10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 27 28 29 30 31 

Thanks for all the help.

推荐答案

这应该在星期天不开始工作。

This ought to work even when February doesn't start on Sunday.

function weekCount(year, month_number) {

    // month_number is in the range 1..12

    var firstOfMonth = new Date(year, month_number-1, 1);
    var lastOfMonth = new Date(year, month_number, 0);

    var used = firstOfMonth.getDay() + lastOfMonth.getDate();

    return Math.ceil( used / 7);
}

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