The timezone of Tonga
Timezones are always computed by their difference to UTC, the "Universal Time Coordinated". In Tonga exists only a single tonezone at UTC+13. E.g. New York has the Eastern Standard Time at UTC-5 and the time difference between NY and Tonga is 18 hours.
Tonga has no time difference between summer and winter. A daylight saving time doesn't exist. Back to overview: Tonga