onClick show Posts from yesterday.

Problem: In my controller, I am selecting the Posts that are created
on todays date. How would I change that to -1 day onClick of
#changeDate in my Students/index.ctp file. I have the Js helper
loaded, as well as RequestHandler component ready.

Any help is greatly appreciated. Thanks!

Here is my StudentsController.php file

public function index() {

//find all classes student is signed up for in students table

$periods = $this->Student->find('all' , array(
'conditions'=>array('Student.user_id'=>$this->Session-
>read('Auth.User.id'),
)));

//for each class student is signed up for, find all information
relating to that class matching the period_id

foreach($periods as $k => $p){
$posts = $this->Period->find('all', array(
'conditions' => array(
'period_id' => $p['Student']['period_id']
)
));

$homework = $this->Post->find('all', array(
'conditions' => array(
'period_id' => $p['Student']['period_id'],
'created' => date('Ymd') ////////////////////////RIGHT
HERE!!!
)
));

$periods[$k]['Period'] = $posts;
$periods[$k]['Post'] = $homework;

}

$this->set('period', $periods);
}

Here is my Students/index.ctp file
<div id="changeDate">Back Arrow</div>

<?php foreach ($period as $what): ?>

<?php foreach($what['Period'] as $ps): ?>
<?php
$lol=
$this->Form->postLink(
'Remove Class',
array('controller' => 'students', 'action'
=> 'delete', $ps['Period']['period_id']),
array('confirm' => 'Are you sure?'));

echo '<div class="classPeriod"><h3>' . ($ps['Period']
['title']) .'</h3><div id="testing">'.$lol . '</div><hr><br>';
?>

<?php foreach ($what['Post'] as $something): ?>

<?php echo $this->Html->link($something['Post']['title'],
array('action' => 'view', $something['Post']['id']));?>

<?php endforeach; ?>

<?php echo '</div>'; ?>

<?php endforeach; ?>

<?php endforeach; ?>

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