NCsoft has posted a notice on their official site informing their customers that they will be changing the time zone for customer account work from Eastern Time to Coordinated Universal Time.

On New Year's Day, January 1, 2008, we'll be changing the time zone used for all customer account work from Eastern time (EST) to Coordinated Universal Time (UTC, basically the same as GMT). This shouldn't make much of a difference to most customers, though some may notice (depending on what time during the day their billing takes place) that the listed billing date may move up by a day (however, technically speaking, you're actually not gaining any extra time).

From : MMORPG.com