It is the current local time right now in Nuku‘alofa, Neiafu, Haveluloto, Vaini, Pangai and in all Tonga’s cities. 
Tonga’s time zone: +13 or UTC+13:00

No daylight saving time (DST) in Tonga.

Full name: Kingdom of Tonga
Continent: Oceania
Region: Polynesia
Population: 122,580
Area: 748 km²
Capital: Nuku'alofa
Currency: Pa'anga (TOP)
Phone code: 676
Domain: .to
Wikipedia article: Tonga