Jamestown runs on UTC+0 (GMT) every day of the year, with no daylight saving time.
Jamestown and your time
Jamestown at a glance
| Country | St. Helena |
|---|---|
| Region | Saint Helena |
| Capital of | St. Helena |
| Time zone | Atlantic/St_Helena |
| Abbreviation now | GMT |
| UTC offset now | UTC+0 |
| Daylight saving time | Not observed |
| Coordinates | 15.92° S, 5.72° W |
Jamestown time zone and clock changes
Local time in Jamestown is UTC+0 year round, under the Atlantic/St_Helena rules. Clocks have not changed for the seasons here since at least 1970.
Jamestown is the capital, and all of St. Helena keeps this time.
Clock changes in Jamestown, 2026 and 2027
No clock changes are scheduled in Jamestown for 2026 or 2027.
How far ahead or behind Jamestown is
When it is 9:00 AM in Jamestown, it is 4:00 AM in New York, 8:00 PM in Sydney and 1:00 AM in Los Angeles.
| City | Time now | Difference now | In January | In July | Shared office hours |
|---|---|---|---|---|---|
| New York (United States) | --:-- | 5 h behind | 5 h behind | 4 h behind | 3 h |
| Los Angeles (United States) | --:-- | 8 h behind | 8 h behind | 7 h behind | None |
| London (United Kingdom) | --:-- | Same time | Same time | 1 h ahead | 8 h |
| Paris (France) | --:-- | 1 h ahead | 1 h ahead | 2 h ahead | 7 h |
| Dubai (United Arab Emirates) | --:-- | 4 h ahead | 4 h ahead | 4 h ahead | 4 h |
| Mumbai (India) | --:-- | 5 h 30 min ahead | 5 h 30 min ahead | 5 h 30 min ahead | 2 h 30 min |
| Singapore | --:-- | 8 h ahead | 8 h ahead | 8 h ahead | None |
| Tokyo (Japan) | --:-- | 9 h ahead | 9 h ahead | 9 h ahead | None |
| Sydney (Australia) | --:-- | 11 h ahead | 11 h ahead | 10 h ahead | None |
| UTC | --:-- | Same time | Same time | Same time | 8 h |
Jamestown never changes its clocks, but many of these cities do. Where the January and July columns disagree, the gap shifts when the other city moves to or from daylight saving time.
Shared office hours counts the time when the clock reads between 9 AM and 5 PM in both cities on the same day.
Sunrise and sunset in Jamestown
Today
| Sunrise | --:-- |
|---|---|
| Sunset | --:-- |
| Day length | -- |
| Solar noon | --:-- |
Day length barely moves in Jamestown, from 11 hours 11 minutes to 13 hours 5 minutes. Sunrise and sunset shift by less than an hour across the year.
Daylight through the year in Jamestown
| Date | Sunrise | Sunset | Day length | |
|---|---|---|---|---|
| March equinox | March 20 | 6:27 AM | 6:34 PM | 12 h 7 min |
| June solstice | June 21 | 6:49 AM | 6:00 PM | 11 h 11 min |
| September equinox | September 23 | 6:12 AM | 6:19 PM | 12 h 7 min |
| December solstice | December 21 | 5:49 AM | 6:53 PM | 13 h 5 min |
Clock time and sun time in Jamestown
Jamestown lies close to the centre of its time zone, so the sun is highest at about 12:25 PM on standard time, close to clock noon.
Same time now, different rules
These places read the same time as Jamestown today but follow different rules, so they can drift apart when clocks change.
- London (United Kingdom)
- Dublin (Ireland)
- Lisbon (Portugal)
- Saint Helier (Jersey)
- Douglas (Isle of Man)
- St Peter Port (Guernsey)
Plan around the time in Jamestown
- Convert a time to or from Jamestown: 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 Jamestown and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What time zone is Jamestown in?
Jamestown uses the Atlantic/St_Helena time zone, which is UTC+0 (GMT) all year.
Does Jamestown use daylight saving time?
No. Jamestown stays on UTC+0 all year, so the time difference to places without daylight saving time never changes.
What is the time difference between Jamestown and New York?
Jamestown is 5 hours ahead of New York in January and 4 hours ahead of New York in July, because New York moves its clocks for daylight saving time and Jamestown does not.
How long is the longest day in Jamestown?
About 13 hours 5 minutes, around the December solstice. The shortest day, around the June solstice, has about 11 hours 11 minutes of daylight.
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.