如何使用jquery从给定的周数计算日期？ [英] How to calculate date from given no.of weeks using jquery ?

问题描述

财政年度为1-52周。所有这些周都显示在下拉列表中（1到52）。我有开始日期和结束日期文本框。从下拉列表中选择34周。当我选择开始日期时，结束日期必须根据所选周数计算。我必须填写结束日期与开始日期相差34周

示例：1

No.Of Weeks：34

选择开始日期：10/27/2016

As根据前2个选项，我计算的结束日期必须是2017年6月22日。但jquery显示06/23/2017



示例：2

No.Of Weeks：21

选择开始日期：10/01/2016

根据前2个选项，我的计算结束日期必须为02/25/2017 。但是jquery正在显示02/28/2017



我尝试过：



以下是我的代码：

  var 周= $（ ＃WeekCount）。val（）; 
  var  stDate =  new  日期（$（ ＃txtStartDate）。val（））; 
  var  enDate =  new  日期（stDate.getFullYear（），stDate.getMonth（）+  1 ，stDate.getDate（）+（weeks *  7 ））; 
 enDate = enDate.getMonth（）+   / + enDate.getDate（）+   / + enDate.getFullYear（）; 

有人可以帮助我的代码出错.?div class =h2_lin>解决方案

（ ＃WeekCount）VAL（）;
var stDate = new 日期（

（ ＃txtStartDate）。val（ ））;
var enDate = new 日期（stDate.getFullYear（），stDate.getMonth（）+ 1 ，stDate.getDate（）+（weeks * 7 ））;
enDate = enDate.getMonth（）+ / + enDate.getDate（）+ / + enDate.getFullYear（）;

有人可以帮助我的代码出错。？

Just Maths。试试这个：

< script> 
函数getDateOfWeeksAway（w，d，m，y）{
 var numOfDaysAway = d + w * 7; 
返回新日期（y，m-1，numOfDaysAway）; 
} 
 alert（getDateOfWeeksAway（34,27,10,2016））; 
< / script> 

A fiscal year is having 1-52 weeks. All these weeks are displaying in a dropdownlist (1 to 52). And i have start date and end date text boxes. Selected 34 weeks from dropdown list. When I selected start date, the end date has to calculate based on the selected weeks.i.e., I have to populate end date with a difference of 34 weeks from start date
Example :1
No.Of Weeks: 34
Selected Start Date: 10/27/2016
As per the first 2 selections my calculated end date has to be 06/22/2017. But the jquery is showing 06/23/2017

Example :2
No.Of Weeks: 21
Selected Start Date: 10/01/2016
As per the first 2 selections my calculated end date has to be 02/25/2017. But the jquery is showing 02/28/2017

What I have tried:

below is my code:

var weeks = $("#WeekCount").val();
var stDate = new Date($("#txtStartDate").val());
var enDate= new Date(stDate.getFullYear(), stDate.getMonth() + 1, stDate.getDate() + (weeks * 7));
enDate= enDate.getMonth() + "/" + enDate.getDate() + "/" + enDate.getFullYear();

Can someone help what is wrong in my code.?

解决方案

("#WeekCount").val(); var stDate = new Date(

("#txtStartDate").val()); var enDate= new Date(stDate.getFullYear(), stDate.getMonth() + 1, stDate.getDate() + (weeks * 7)); enDate= enDate.getMonth() + "/" + enDate.getDate() + "/" + enDate.getFullYear();

Can someone help what is wrong in my code.?

Just Maths. Try this:

<script>
function getDateOfWeeksAway(w, d, m, y) {
    var numOfDaysAway = d + w * 7;
    return new Date(y, m-1, numOfDaysAway);
}
alert(getDateOfWeeksAway(34, 27, 10, 2016));
</script>

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