Time zone · Antarctic
DUMONT
Dumont-d’Urville Time
Dumont-d'Urville Time is used at France’s Dumont d'Urville research station in Antarctica, locked permanently at UTC+10:00 since 1956—no daylight saving changes, no seasonal shifts, just one constant offset serving researchers on the ice.
Thursday, October 15, 2026
Current offset
UTC+10:00
Standard · +10
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About DUMONT
A fixed, year-round offset.
Dumont-d'Urville Time is used at France’s Dumont d'Urville research station in Antarctica, locked permanently at UTC+10:00 since 1956—no daylight saving changes, no seasonal shifts, just one constant offset serving researchers on the ice.
IANA zones · the technical identifiers
The zone that resolve to DUMONT.
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 DUMONT is used
One country.
Same offset · UTC+10:00
Other zones at UTC+10:00 right now.
These named zones share DUMONT's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
DUMONT to the world's clocks.
Frequently asked questions
Common questions about DUMONT, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Why does this timezone have such a long and specific name?
- It is named after the French explorer Dumont d'Urville, who explored Antarctica in the 19th century, and the timezone is centered on the research station bearing his name—making it one of the few timezone names tied directly to a polar explorer.
- Does the timezone ever change for daylight saving?
- No—Dumont-d'Urville Time has never observed daylight saving time, remaining fixed at UTC+10:00 year-round since its formal adoption in November 1956.
- Is this timezone used anywhere outside Antarctica?
- Exclusively in Antarctica; only the Dumont d'Urville research station and its immediate operational zone fall under this timezone—making it one of the most geographically restricted offsets on Earth.
- Why is the current offset valid since 1956?
- The station has been in use since 1956 and has kept UTC+10:00 ever since, with no changes.
- Do people here experience sunset like elsewhere?
- Dumont d’Urville sits just inside the Antarctic Circle, so around the June solstice the sun only just clears the horizon at midday, while for several weeks around the December solstice it stays up all night. The clock stays on UTC+10:00 through both.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
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