Current Time in IANA Atlantic/St_Helena Timezone
IANA Name: Atlantic/St_Helena
Standard Offset: UTC +00:00
Daylight Saving: No
Currently Observing DST: No ❌
Atlantic/St_Helena: The Time Zone of a Remote British Island
The Atlantic/St_Helena time zone is the official time for the island of St Helena, a British Overseas Territory in the South Atlantic Ocean. It uses UTC+00:00 (Greenwich Mean Time, GMT) year-round, with no daylight saving time. This zone is unique to St Helena, making it the only territory that exclusively uses this IANA identifier.
Where Atlantic/St_Helena Applies
Atlantic/St_Helena applies solely to the island of St Helena, a remote volcanic island located about 1,200 miles west of the African coast. The territory includes the main island of St Helena, as well as the islands of Ascension and Tristan da Cunha (though those have their own time zone history). St Helena's capital and largest settlement is Jamestown. The island uses this time zone for all civil and official purposes.
Standard Offset and Abbreviation
The standard offset is UTC+00:00, which is the same as Coordinated Universal Time (UTC) and Greenwich Mean Time (GMT). The common abbreviation is GMT (Greenwich Mean Time). Because St Helena does not observe daylight saving time, the offset remains constant throughout the year. This means that local time on St Helena is always exactly the same as UTC/GMT.
No Daylight Saving Time
St Helena does not observe daylight saving time. The island is located near the equator (latitude 15°S), so day length varies little throughout the year. There is no practical benefit to shifting clocks, and the territory has never adopted DST. As a result, the time zone is stable and predictable: no spring-forward or fall-back adjustments occur.
Countries and Cities in Atlantic/St_Helena
The only territory using Atlantic/St_Helena is St Helena itself. The main city is Jamestown (population about 600). Other settlements include Half Tree Hollow, Longwood, and Sandy Bay. The entire island's population is around 4,500 people. No other countries or cities use this zone; it is exclusive to St Helena.
Other IANA Zones at the Same Offset
Several other IANA time zones share the same standard offset of UTC+00:00 (GMT). These include zones across West Africa: Africa/Abidjan, Africa/Accra, Africa/Bamako, Africa/Banjul, Africa/Bissau, Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, Africa/Monrovia, Africa/Nouakchott, and Africa/Ouagadougou. However, many of these zones observe daylight saving time or have historical variations, whereas Atlantic/St_Helena remains constant.
Practical Guidance for Scheduling
Because Atlantic/St_Helena is always UTC+00:00, it aligns with GMT year-round. For business hours overlap, note that St Helena's working day typically runs from 8:00 AM to 4:00 PM local time (GMT). This overlaps well with London (GMT/BST) during winter (when London is on GMT, full overlap). During British Summer Time (BST, UTC+01:00), London is one hour ahead, so St Helena's morning aligns with London's late morning. For the US East Coast (EST, UTC-05:00), St Helena is 5 hours ahead in winter; during EDT (UTC-04:00), it is 4 hours ahead. For West Africa (e.g., Lagos, UTC+01:00), St Helena is one hour behind. For South Africa (UTC+02:00), it is two hours behind. For Australia (AEST, UTC+10:00), St Helena is 10 hours behind. Use the constant GMT offset for easy calculations.
Frequently Asked Questions
Does St Helena observe daylight saving time?
No. Atlantic/St_Helena does not observe daylight saving time. The offset is UTC+00:00 (GMT) all year round.
What is the time difference between St Helena and London?
In winter (GMT), St Helena and London are the same time. In summer (BST, UTC+01:00), London is 1 hour ahead of St Helena.
Is Atlantic/St_Helena the same as GMT?
Yes. Atlantic/St_Helena is always UTC+00:00, which is equivalent to Greenwich Mean Time (GMT).
What other places share the same time as St Helena?
Many West African countries use UTC+00:00, such as Ghana (Africa/Accra) and Ivory Coast (Africa/Abidjan). However, some may observe daylight saving time, while St Helena does not.
How do I call St Helena from the US?
St Helena is 4 or 5 hours ahead of US Eastern Time depending on daylight saving. Check current GMT offset: St Helena is always GMT. For example, when it's 12:00 PM EST (UTC-05:00), it's 5:00 PM on St Helena.
Why is St Helena's time zone called Atlantic/St_Helena?
It follows the IANA naming convention: 'Atlantic' for the region (South Atlantic Ocean) and 'St_Helena' for the territory. It is the only zone for St Helena.