The Pacific island group containing Kiritimati and using UTC+14 is the Line Islands.
The Line Islands are part of Kiribati, an island country spread across a vast area of the central Pacific. Kiritimati, also called Christmas Island, is the group’s largest atoll by land area. Its civil time is Line Islands Time, which is UTC+14, the most advanced standard time zone in common use.
That time-zone position means Kiritimati is among the first inhabited places to reach midnight on January 1. The effect is a result of the International Date Line and Kiribati’s 1995 decision to shift the date line around its eastern islands so the country could share the same calendar day more consistently.
This fact is often described loosely as “the first place in the world,” but the precise claim depends on what is being measured: inhabited settlement, territory, or first sunrise. Kiritimati’s date is also one day ahead of places in nearby Pacific regions that use earlier offsets.