Time zone · Antarctic
FSAT
French Southern & Antarctic Time
French Southern & Antarctic Time (FSAT) is one of the world's loneliest time zones, anchored to the windswept Kerguelen Islands where the clock has stayed locked at UTC+05:00 since 1967 with no daylight saving. Nobody lives there permanently, nobody schedules "end-of-day" handoffs, and the only shift in time is driven by the relentless Antarctic seasons.
Saturday, June 6, 2026
Current offset
UTC+05:00
Standard · +05
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About FSAT
A fixed, year-round offset.
French Southern & Antarctic Time (FSAT) is one of the world's loneliest time zones, anchored to the windswept Kerguelen Islands where the clock has stayed locked at UTC+05:00 since 1967 with no daylight saving. Nobody lives there permanently, nobody schedules "end-of-day" handoffs, and the only shift in time is driven by the relentless Antarctic seasons.
IANA zones · the technical identifiers
The zone that resolve to FSAT.
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.
Cities currently on FSAT
The same hour, city by city.
1 city · all UTC+05:00
Where FSAT is used
One country.
Same offset · UTC+05:00
Other zones at UTC+05:00 right now.
These named zones share FSAT's offset today. When daylight saving rules differ, they drift apart for part of the year.
Frequently asked questions
Common questions about FSAT, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Why doesn't FSAT have any daylight saving?
- With only rotating research staff and no permanent civilian population, there's simply no practical reason to shift clocks; operations run on mission schedules, not seasonal light cycles.
- Is FSAT tied to a specific city or coordinate?
- It's not a city but a maritime time zone centered at 69°21′S, serving as the legal standard for all ships and stations in this remote Antarctic territory.
- What happens if I send someone in FSAT an email marked “Today”?
- There's no shared context for “today”—with staff arriving on research rotations, timestamps matter far more than human-friendly labels.
- Does FSAT ever change historically?
- Yes: before 1967 it was UTC+06:00, but was permanently set to +05 to better align with supply chains from South Africa.
- Are there any time zones similar to FSAT?
- Like Chatham Islands (UTC+12:45/+13:45) or UTC±00, FSAT is an outlier—designed for extreme isolation rather than geopolitical borders.
- Why is FSAT so unknown?
- No airlines fly there, no apps list it, and the only residents are scientists and penguins—FSAT is timekeeping at its most exclusive.
Free · Developer API
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