note 28299 rejected from function.getdate by nicos

Newbie question -- How do I grab the date a file was uploaded to an FTP server? I've got a simple page that displays a jpg which is updated every hour (it's from a weatherstation that uploads temp, humidity, etc at regular intervals) and I want to timestamp it on the page so that viewers know how relevant the informaiton is. I know this must be an absurdly simple thing to do. I just can't figure it out. Thanks!