You may have noticed that virtually every date on the site says "posted 5 mins 20 seconds ago". There is good reason for this, you see managing timezones and daylight saving all around the world is a virtual nightmare. So the solution is not to show any time at all and instead display a countdown. However thanks to a PHP function: date_default_timezone_set managing timezones is now very easy.
So whilst most dates will remain "5 mins 20 seconds ago", provided you set the correct date when you edit your profile, all dates on the site should now be 100% accurate for you.