I want to redirect a User after an specific date in Wordpress

My problem is that I want to make a birthday Website for a friend in Wordpress. I got the Timer and I have a redirection Plugin that sends the user after some time to another url. My problem is that I also want to send the user after a specific date to another Website. So far I tried an If statement that was like if we have this date execute this function but that didnt work. If someone has any sugestions how to redirect an user after a specific date(it doesnt have to be this code) I would gladly appreciate it. Here is the code:

add_shortcode('redirect', 'scr_do_redirect');
function scr_do_redirect($atts)
{
ob_start();
$myURL = (isset($atts['url']) && !empty($atts['url']))?esc_url($atts['url']):"";
$mySEC = (isset($atts['sec']) && !empty($atts['sec']))?esc_attr($atts['sec']):"0";
if(!empty($myURL))
{
?>
    <meta http-equiv="refresh" content="<?php echo $mySEC; ?>; url=<?php echo $myURL; ?>">
    Please wait while you are redirected...or <a href="<?php echo $myURL; ?>">Click Here</a> if you do not want to wait.

<?php
}
return ob_get_clean();
}

?>