Facebook "last seen" feature?

[an anonymous girl]

On Facebook chat, if someone sends me a message and I see it at, for example, 11:35, a timestamp will show up that lets the other person know I saw their message at that time. If I get off Facebook, and come back to the message later to re-read it, let's say at 12:00, will the timestamp change to show them I saw it at 12, or does it stick with just displaying the first time I saw the message?

I hope that question wasn't too confusing. Thanks!

[Faayez Kazi]

It will show the time when u first saw it like if u saw it at 11:35 then again seen it at 12 it will show "seen 11:35" not 12