jquery - Countdown timer get values -

i playing around countdown timer. created input fields values , wrapped jquery in function called on button click.

inside function did this:

var d = document.getelementbyid('#day').value; 

etc.

then in countdown time, instead of number added variable d day not work.

can tell me how have jquery pull in value user input?

here codepen code: http://codepen.io/bskousen/pen/jopveb

it should be

var d = document.getelementbyid('day').value; 

or

var d = $('#day').val()