Atlantic/St_Helena is an IANA time zone used in St. Helena. It stays on UTC+0 all year.
Atlantic/St_Helena at a glance
| UTC offset now | UTC+0 |
|---|---|
| Standard time | UTC+0 (GMT) |
| Abbreviations | GMT |
| Used in | St. Helena |
How Atlantic/St_Helena keeps time
Atlantic/St_Helena stays on UTC+0 all year. The tz database records no daylight saving time in this zone since 1970.
Countries and cities on Atlantic/St_Helena
Atlantic/St_Helena is used in St. Helena. These are the largest cities in our list that follow it.
Atlantic/St_Helena compared with other time zones
Differences change during the year when one side moves to or from daylight saving time, so the table shows January and July separately.
| City | Time now | Difference now | In January | In July |
|---|---|---|---|---|
| New York (United States) | --:-- | 5 h behind | 5 h behind | 4 h behind |
| Los Angeles (United States) | --:-- | 8 h behind | 8 h behind | 7 h behind |
| London (United Kingdom) | --:-- | Same time | Same time | 1 h ahead |
| Paris (France) | --:-- | 1 h ahead | 1 h ahead | 2 h ahead |
| Dubai (United Arab Emirates) | --:-- | 4 h ahead | 4 h ahead | 4 h ahead |
| Mumbai (India) | --:-- | 5 h 30 min ahead | 5 h 30 min ahead | 5 h 30 min ahead |
| Singapore | --:-- | 8 h ahead | 8 h ahead | 8 h ahead |
| Tokyo (Japan) | --:-- | 9 h ahead | 9 h ahead | 9 h ahead |
| Sydney (Australia) | --:-- | 11 h ahead | 11 h ahead | 10 h ahead |
| UTC | --:-- | Same time | Same time | Same time |
Other zones on UTC+0 right now
These IANA zones show the same time as Atlantic/St_Helena today. Their clock-change rules may differ.
- Africa/Abidjan
- Africa/Accra
- Africa/Bamako
- Africa/Banjul
- Africa/Bissau
- Africa/Casablanca
- Africa/Conakry
- Africa/Dakar
- Africa/El_Aaiun
- Africa/Freetown
- Africa/Lome
- Africa/Monrovia
Using Atlantic/St_Helena in software
Store and send the zone as its IANA name, Atlantic/St_Helena, not as a fixed offset. A fixed offset such as UTC+0 gives the wrong result after the next clock change.
Show the current time in Atlantic/St_Helena:
// JavaScript
new Intl.DateTimeFormat('en-GB', { timeZone: 'Atlantic/St_Helena', timeStyle: 'long' }).format(new Date());
# Python
from datetime import datetime
from zoneinfo import ZoneInfo
datetime.now(ZoneInfo('Atlantic/St_Helena'))
// PHP
(new DateTime('now', new DateTimeZone('Atlantic/St_Helena')))->format('c');
# Shell
TZ=Atlantic/St_Helena dateTools for time in Atlantic/St_Helena
- Convert a time to or from Atlantic/St_Helena: pick a date and time and see it in every city on your list.
- Add Jamestown to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in Atlantic/St_Helena and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What is the UTC offset of Atlantic/St_Helena?
UTC+0, all year.
What abbreviation does Atlantic/St_Helena use?
GMT. Abbreviations are not unique, so use the zone name Atlantic/St_Helena in software.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.