input “value” is changing the output

Question

Pick 2 dates, calculate the total day difference between 2 dates and append it in #finaldays however somethig happens:

As I set value to input:

<input id="from" value="justAvalue" />

I get some unexpected result(negative num appears as you select later dan 14th), see(problem): http://jsfiddle.net/9EZXx/5/

If I just remove the value:

<input id="from" /> 

I just get the expected result, see: http://jsfiddle.net/f2hL6/1/

How does value of input change the situation?

"result must be: select date1 and as date2 selected output the result"

Answer 1

Try using placeholder instead of value

<input id="from" placeholder="aa" />
<input id="to" placeholder="aa" />
<div id="finalDays"></div>