If I reply to your post it shows you in your time what time it was when I made my post. If am 3 hours ahead of your time it will put a (+3) after your time stamp and you wil know that it was 3 hours later in my time when I posted it than it was for you.

(now thats really confusing)

But I might be talking to someone from Australia who is 18 hours ahead of me and I am having a good time on saturday night and they are getting ready for church on sunday.... not a big deal, but would be nice info to have and it really isnt too much to add the way I suggested.