Andy, the time shown is the current time in the specified zone. So, if you post a message at 8pm EDT, it shows up as 8pm ET. Same would be true if we were on standard time. A message posted at 8pm EST will show up as 8pm ET. The amount of code required to make the distinction between standard and daylight savings time is not worth the effort.
Those of you in Indiana and Arizona (time zone jumpers...outta be outlawed), will have to adjust the setting twice a year to reflect your state's allegiance to the time zone in effect.