Countdown to date function?

You can use the following function to display it

<?php
function days_to_go(){
    $datetime1 = new DateTime('2013-3-2');//Pass resignation date as a parameter.
    $datetime2 = new DateTime(now);
    $interval = $datetime1->diff($datetime2);
    echo $interval->format('%a days to go');
}
?>

For more information on date_diff function see this page.