Lock thread after X days mod ?

[z0diac]

I've searched but to no avail. Is there any mod out there that will auto-lock threads older than 'X' (say 30) days ?? I have a rule of no replies to threads where the last post to it is 30 days old or longer, but people keep dragging up old threads from the graveyard.

'Would be great if there was a cronjob mod that would ask how long since last post, then once a night go through the forums and auto-lock all threads that are past their date.