how do I create pdf fullcalendar for 12 months?

Question

I have popular fullcalendar.js embedded in my page i can use below code to print for one month

<button class="printBtn hidden-print">Print</button>
<script type="text/javascript">
$('.printBtn').on('click', function (){
window.print();
});

but now I want to add a print functionality to so that user can print for 12 months.

UPDATE: I want to generate a pdf like how this timeanddate.com creates.