The Réunion time difference is +4 hours from London and +9 hours from New York in winter, and +3 hours and +8 hours in summer (UK and US daylight saving seasons; Réunion does not change its clocks).
In practice, when it is noon in London it is 16:00 in Saint-Denis during UK winter time (GMT) and 15:00 during British Summer Time. When it is noon in New York, it is 21:00 in Saint-Denis during Eastern Standard Time and 20:00 during Eastern Daylight Time.
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Live local time
Calculated by your browser from the IANA time zone database.
Time in Réunion: key facts
- Time zone: UTC+4, IANA identifier
Indian/Reunion - Difference with London: +4 h in UK winter (GMT), +3 h during British Summer Time
- Difference with New York: +9 h during Eastern Standard Time, +8 h during Eastern Daylight Time
- Daylight saving in Réunion: no, local time stays the same all year
- Next clock changes: UK on Sunday 25 October 2026 (BST to GMT) and Sunday 28 March 2027; US on Sunday 1 November 2026 (EDT to EST) and Sunday 14 March 2027
Time difference between London, New York and Réunion
| Time in London | In Saint-Denis (UK winter, GMT) | In Saint-Denis (UK summer, BST) |
|---|---|---|
| 08:00 | 12:00 | 11:00 |
| 12:00 | 16:00 | 15:00 |
| 18:00 | 22:00 | 21:00 |
| 22:00 | 02:00 (next day) | 01:00 (next day) |
| Time in New York | In Saint-Denis (US winter, EST) | In Saint-Denis (US summer, EDT) |
|---|---|---|
| 08:00 (8 am) | 17:00 | 16:00 |
| 12:00 (noon) | 21:00 | 20:00 |
| 18:00 (6 pm) | 03:00 (next day) | 02:00 (next day) |
| 22:00 (10 pm) | 07:00 (next day) | 06:00 (next day) |
The difference of one hour between winter and summer comes from daylight saving time in the UK and the US; local time in Réunion does not change.
Clock changes 2026–2027
Réunion does not observe daylight saving time: local time stays at UTC+4 all year round. Only clock changes in your home country alter the gap.
Clocks change on the following dates (local time):
- UK, Sunday 25 October 2026: BST (UTC+1) to GMT (UTC+0)
- US, Sunday 1 November 2026: EDT (UTC−4) to EST (UTC−5) in New York
- US, Sunday 14 March 2027: EST (UTC−5) to EDT (UTC−4)
- UK, Sunday 28 March 2027: GMT (UTC+0) to BST (UTC+1)
- UK, Sunday 31 October 2027: BST (UTC+1) to GMT (UTC+0)
- US, Sunday 7 November 2027: EDT (UTC−4) to EST (UTC−5)
When to call Réunion from the UK or the US
To reach someone between 09:00 and 20:00 Saint-Denis time, call between 05:00 and 16:00 London time in UK winter, and between 06:00 and 17:00 during British Summer Time. From New York, call between 00:00 and 11:00 during EST, and between 01:00 and 12:00 during EDT.
On 15 January 2027, office hours (09:00–17:00) overlap for 4 hours with London and for 0 hours with New York. Always state the time zone in your meeting invitations.
Time difference and jet lag: practical tips
Flying to Réunion from the UK means travelling east: your day is shortened and you need to go to bed earlier than usual. From North America you also travel east, with a bigger gap. A few simple rules help you adjust to local time:
- Set your watch and phone to local time as soon as you board.
- Align meals and bedtime with local time from the first day.
- Plan a light first day, with no important meetings or long drives.
- Get out in daylight when you arrive and avoid long naps.
- If you take medication at fixed times, ask your doctor how to adapt the schedule to the time difference.
Réunion time zone: IANA identifier and history
| Zone | IANA identifier | Standard time on 15 January 2027 | On 15 July 2027 | Abbreviation |
|---|---|---|---|---|
| Saint-Denis | Indian/Reunion | UTC+4 | UTC+4 | — |
- Saint-Denis (
Indian/Reunion): no clock change recorded since 1 January 1970.
No daylight saving time in Réunion in 2027
The tz database lists no clock change in 2027 for Indian/Reunion: standard time remains UTC+4 all year. Only the UK clock changes (Sunday 28 March and Sunday 31 October 2027) and the US clock changes (Sunday 14 March and Sunday 7 November 2027) alter the gap.
| 2027 period | Saint-Denis vs London | Saint-Denis vs New York |
|---|---|---|
| 1 January – 13 March | +4 h | +9 h |
| 14 – 27 March | +4 h | +8 h |
| 28 March – 30 October | +3 h | +8 h |
| 31 October – 6 November | +4 h | +8 h |
| 7 November – 31 December | +4 h | +9 h |
Sunrise and sunset in Saint-Denis in 2027
Local sunrise and sunset times on the 15th of each month in Saint-Denis (20.88° S, 55.45° E). They help you time your exposure to daylight, the main lever for resetting your body clock on arrival.
| 15th of the month | Sunrise | Solar noon | Sunset | Day length | Sunrise / sunset in London time |
|---|---|---|---|---|---|
| January | 05:50 | 12:27 | 19:05 | 13 h 16 | 01:50 / 15:05 |
| February | 06:09 | 12:32 | 18:56 | 12 h 47 | 02:09 / 14:56 |
| March | 06:20 | 12:27 | 18:34 | 12 h 14 | 02:20 / 14:34 |
| April | 06:30 | 12:18 | 18:07 | 11 h 37 | 03:30 / 15:07 |
| May | 06:41 | 12:15 | 17:48 | 11 h 08 | 03:41 / 14:48 |
| June | 06:53 | 12:19 | 17:45 | 10 h 52 | 03:53 / 14:45 |
| July | 06:55 | 12:24 | 17:53 | 10 h 58 | 03:55 / 14:53 |
| August | 06:41 | 12:23 | 18:05 | 11 h 23 | 03:41 / 15:05 |
| September | 06:15 | 12:14 | 18:12 | 11 h 58 | 03:15 / 15:12 |
| October | 05:47 | 12:04 | 18:21 | 12 h 33 | 02:47 / 15:21 |
| November | 05:30 | 12:03 | 18:36 | 13 h 06 | 01:30 / 14:36 |
| December | 05:31 | 12:13 | 18:55 | 13 h 23 | 01:31 / 14:55 |
The longest day in the table is 15 December (13 h 23 between 05:31 and 18:55), the shortest 15 June (10 h 52).
Jet lag: how flight direction affects you in Réunion
- Outbound from the UK (flying east): you « lose » 4 hours in UK winter and 3 hours in summer; your arrival day is shortened and you need to go to bed earlier than your body clock expects.
- Return to the UK (flying west): the opposite applies. Flying west is generally considered easier to cope with: you just need to stay up a little later.
- From New York (flying east): you « lose » 9 hours in winter (EST) and 8 hours in summer (EDT); your arrival day is shortened and you need to go to bed earlier than your body clock expects.
- Your usual night at home (23:00 – 07:00) corresponds to 03:00 – 11:00 in Saint-Denis from London in UK winter (02:00 – 10:00 during BST), and to 08:00 – 16:00 in Saint-Denis from New York during EST (07:00 – 15:00 during EDT): this is when your body will want to sleep for the first few days.
- Daylight on arrival: in Saint-Denis, the sun rises around 05:50 and sets around 19:05 in mid-January, and around 06:55 and 17:53 in mid-July (table above). After flying east, seek morning light and avoid it late in the day; after flying west, make the most of late-afternoon light to stay awake until the evening. This is the standard advice for shifting your body clock.
Plan your trip to Réunion
- Our complete Réunion travel guide: highlights, itineraries and budget
- Best time to visit Réunion: month-by-month weather and the best season
- Time differences around the world: every country in our guides
Frequently asked questions
What is the time difference between Réunion and the UK or the US?
Réunion is 4 hours ahead of London in UK winter and 3 hours ahead of London during British Summer Time. It is 9 hours ahead of New York during Eastern Standard Time and 8 hours ahead of New York during Eastern Daylight Time.
What time is it in Réunion when it is noon in London or New York?
Noon in London is 16:00 in Saint-Denis in UK winter and 15:00 in summer. Noon in New York is 21:00 in Saint-Denis during EST and 20:00 during EDT.
Does Réunion have daylight saving time?
No, local time stays at UTC+4 all year. Only clock changes in the UK or the US alter the gap.
When should I call Réunion from the UK or the US?
To reach someone between 09:00 and 20:00 local time, call between 05:00 and 16:00 London time in UK winter (06:00 to 17:00 during BST), or between 00:00 and 11:00 New York time during EST (01:00 to 12:00 during EDT).
What is the IANA time zone for Réunion?
Saint-Denis: Indian/Reunion.
What time does the sun rise in Saint-Denis?
Around 05:50 on 15 January 2027 and around 06:55 on 15 July 2027 (local time); sunset around 19:05 and 17:53. Destination de Voyage calculation (NOAA algorithm).
Our sources
- Sunrise and sunset: algorithm from the NOAA Solar Calculator (Global Monitoring Laboratory), applied to the capital’s coordinates (Natural Earth, Wikidata or Wikipedia): Destination de Voyage calculation.
- IANA Time Zone Database (tz database), version 2026b, consulted on 13 October 2026: time zones, rules and clock-change dates. Future dates may be changed by local authorities.
- UK clock changes: GOV.UK, When do the clocks change? (UK summer time from the last Sunday in March to the last Sunday in October).
- US daylight saving time: NIST, Daylight Saving Time (from the second Sunday in March to the first Sunday in November).
- Live time: calculated by your browser (Intl API), which relies on the same IANA database.
- Our methodology
Updated November 2026.