grr Last Bred

[Chibi_Chicken]

It looks like the last bred just stores the return value of time()
http://php.net/manual/en/function.time.php (for more info)

you could echo out the date with the date function, like:
date('Y-m-d', $lastweek) to see what it is.

beyond that I am not sure, I haven't work with the time() or the breeding script that much.