Can't access time helper from view

<?php echo $time->timeAgoInWords($row['Forum']['modified']); ?>

The modified column from which I am receiving the data is formatted as MySQL datetime.

I am trying to use the above code to get a time value shown formatted with timeAgoInWords(), but I keep getting this error.

Undefined property: time [APP\views\forums\view.ctp, line 6开发者_C百科0]

I don't understand why I am getting this error.

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In Your controller or app_controller, Put below code,

var $helpers = array('Form', 'Html', 'Javascript', 'Time');