Time zone · Antarctic
TST
Troll Summer Time
Troll Summer Time (TST) operates exclusively on research station Troll in Antarctica, where clocks jump two hours ahead of standard UTC to maximize sunlight during the long polar daylight—there's no nearby country to sync with, so TST simply goes by the sun during summer, swapping its offset while the rest of the world stays put.
Friday, June 5, 2026
Current offset
UTC+02:00
Daylight · +02
Daylight saving
Active
Reverts 25 Oct 2026
IANA zones
1
1 observe DST, 0 don't
DST offset
—
No summer variant
About TST
Standard time, with a summer shift.
Troll Summer Time (TST) operates exclusively on research station Troll in Antarctica, where clocks jump two hours ahead of standard UTC to maximize sunlight during the long polar daylight—there's no nearby country to sync with, so TST simply goes by the sun during summer, swapping its offset while the rest of the world stays put.
IANA zones · the technical identifiers
The zone that resolve to TST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Where TST is used
One country.
Same offset · UTC+02:00
Other zones at UTC+02:00 right now.
These named zones share TST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Frequently asked questions
Common questions about TST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Why does Troll use UTC+02 in summer?
- The two-hour adjustment follows Norwegian standard time, matching practical needs at the research station — Troll uses positive offset in summer to coordinate operations with sponsoring countries.
- TST has only one member zone?
- Yes — the entire region is solely Antarctica/Troll. The high polar latitude shifts its clocks ±2 hours and 1 minute. It switches annually as summer compensates for extreme daylight variation during Antarctic summers..
- Why is there nearly 24-hour sunlight at Troll?
- Troll research station sits at 72°S latitude — in summer, this means constant daylight. The summer setting UTC+02 helps station crews match their body clocks to a practical working schedule despite 24-hour sunlight.
- Antarctica has no native population — why the 'time zone?
- Research stations keep time for logistics. Troll follows Norway’s standard (+01 / +02 DST) to align with its home country Norway’s schedules, mail, and crew rotations.
- Next DST ends Oct 25?
- That’s when clocks fall back from +02 to +00 — marking end of constant daylight season at 72°S and return to GMT standard..
Free · Developer API
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