Update timeago.php

This fixes strange values shown in the "Recently Added" area and eliminates hundreds of PHP warnings ("date() expects parameter 2 to be long, object given") in the apache error log.
Merge pull request #86 from ljm42/patch-1

Fix: strange values shown in the "Recently Added" area and eliminates hundreds of PHP warnings ("date() expects parameter 2 to be long, object given") in the apache error log.