For the first hour ( UTC 10:00 â `` 10:59 ) , this phenomenon affects inhabited territories , whereas during the second hour ( UTC 11:00 â `` 11:59 ) it only affects an uninhabited maritime time zone twelve hours behind UTC . For the first hour ( UTC 10:00 â `` 10:59 ) , this is true for inhabited territories , whereas during the second hour ( UTC 11:00 â `` 11:59 ) it is only true if one counts an uninhabited maritime time zone twelve hours behind UTC .