Going to agree with the first poster. Doesn't sound like you tried very hard. However, I recently read a post that reminded us (monks in general) that we shouldn't force newbies to go through the pain we did.

In an effort to help, but not give you the answer, have you considered that perl isn't the best solution for this? If you're on a *nix system, a ps command with the right switches and grep filters can produce what you need. The only thing you'd need is to change the time to epoch time. Look at system(). This is the "easiest" and "simplest" method, but there are much better solutions that don't rely on the underlying system commands.

If you need a pure perl solution because you're on a windows systems(even then, there's tasklist), you're in pursuit of better practices, or this is a homework assignment, see the posts by my fellow monks above.