Originally Posted by blackmonsters

I hear what you are saying but the copyright date is not actually supposed to
be updated. It's the date of the first and only copyright.
Nobody "re-copyrights" anything.
The date allows you to sue for violations back to the date of copyright.

If someone violated your copyright in 2005 and you actually changed your
official copyright form to 2011 then you were not protected in 2005 by your
own proclamation that you filed for copyright in 2011. (see disclaimer)

Nobody does that and I don't even know if it would be allowed.

Of course you could apply for a new copyright but you would need to have
changed something to make it different than the previous copyright.

But yeah, people do update it on their websites anyway.

Disclaimer : You are allowed 5 years to file a copyright without losing the
right to sue for punitive damages. You'd still be able to sue for "actual damages" however.