CODEWITHSUNDEEP
javascriptdatedatepicker
Sapnesh Naik
Sapnesh Naik

Reputation: 11656

JavaScript | erroneous result when adding month to date using a variable

I am trying to add months to a date based on month variable, but I get wrong result when I try to fetch month from an input field and pass it. and I get the correct result if I myself define a variable and pass it to setMonth.

here is the code :

when I use static value :

.on('changeDate', function(e){

        var datea = new Date(e.date);
        console.log(datea);
        // var montha = $('#duration').val();
        // console.log(montha);
        montha = 3 ;
         datea.setMonth(datea.getMonth()+ montha);
         datea = datea.getDate() + "/" + datea.getMonth() + "/" + datea.getFullYear();

         console.log(datea);
         $('#end_date').val(datea);

    });

console output :

Sat Apr 01 2017 00:00:00 GMT+0530 (India Standard Time)
1/6/2017

as you can see it prints correct output

but If I try fetching the month value from an input field

.on('changeDate', function(e){

        var datea = new Date(e.date);
        console.log(datea);
        var montha = $('#duration').val();
        console.log(montha);

         datea.setMonth(datea.getMonth()+ montha);
         datea = datea.getDate() + "/" + datea.getMonth() + "/" + datea.getFullYear();

         console.log(datea);
         $('#end_date').val(datea);

    });

Console output :

Sat Apr 01 2017 00:00:00 GMT+0530 (India Standard Time)
3
1/9/2019

even though the montha has value 3 the output result is not correct.

Please help me solve this

Upvotes: 0

Views: 67

Answers (1)

Wei
Wei

Reputation: 372

I took a check in my browser console, and I think the issue may cause by the input value was not casting to number type. From the below picture, the date1 is adding 3 (number type) to setMonth function, then get the correct date "2017/7/...". However, the date2 is adding '3'(string type) to setMonth function then get date "2019/10/...".

enter image description here

Upvotes: 2

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