Up until December 30, 2011, American Samoa’s time zone was GMT-11 hours (no DST). The Islands are very close to the International Date line, the place where time changes by a day.
This was creating problems for American Samoa, as they are much more socially connected to Asia than to Mainland America. So AS has officially moved into tomorrow, permanently losing a day in the process. American Samoa will be at GMT+13 instead of GMT-11, making them in the first time zone to start a new day.