How to calculate date from given no.of weeks using jquery ?

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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:

JavaScript

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.?

Posted 9-Nov-16 0:51am

Murali Krishna Babu

Updated 9-Nov-16 2:17am

v2

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Karthik_Mahalingam 9-Nov-16 8:18am

what is the formula you are using to calculate?

1 solution

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Peter Leow · Accepted Answer · 2016-11-09T02:17:00

Solution 1

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>

Posted 9-Nov-16 2:17am

Peter Leow

Updated 9-Nov-16 2:18am

v2