Javascript复制日期+一年

Question

I don't know why i can't find an answer to this but its been over 2 hours of searching now and I'm about ready to break something.

All i need to do is copy a user entered date and add one year:

<input id='r_start' name='r_start' type='date' value='' />
<input id='r_end' name='r_end' type='date' value='' />

so when r_start is edited, r_end is automatically updated to plus one year,

this should not be difficult right? Been a long day!

-> Calendar year please

Answer 1

jsFiddle Demo

HTML

<input id='r_start' name='r_start' value='' type='date'/>
<input id='r_end' name='r_end' value='' type='date' />

JavaScript

$(document).ready(function(){
    $('#r_start').on('change',function(){
        var d = new Date($(this).val());
        d.setMonth(d.getMonth()+13);
        var a = ((d.getMonth()) < 10) ? '0'+(d.getMonth()) : (d.getMonth());
        var b = (d.getDate() < 10) ? '0'+d.getDate() : d.getDate();
        d = d.getFullYear()+'-'+a+'-'+b;
        $('#r_end').val(d);
    });
});

Answer 2

jsFiddle Demo

Just add 12 months to the date:

 var yourDate = new Date();
 yourDate.setMonth(yourDate.getMonth()+12);