RET — Reunion Time
UTC+4 with no daylight saving time — view what RET means, where it’s used, and convert RET to other time zones.
How to Convert RET to Other Time Zones
Open the RET converter page: Go to https://www.xconvert.com/time-converter/ret-time-zone to open the visual comparison grid with Reunion Time (RET) pre-loaded at UTC+04:00. This page is useful when you need to line up working hours in Réunion with teams in Europe, the Gulf, or Asia, such as scheduling a supplier call, a remote support shift, or a travel connection through Dubai or Paris.
Add comparison cities: Click + Add City and search for cities that commonly interact with RET-based schedules, such as Paris, Dubai, and Mumbai. Paris is relevant for French administrative and business coordination with Réunion, Dubai is a major aviation and trade hub in the Gulf, and Mumbai is useful for IT, outsourcing, and Indian Ocean business overlap.
Select a time range on the grid: Click Select if needed, then drag across the RET row to highlight a meeting window, such as 9:00 AM to 11:00 AM RET. That selection shows immediately in the other rows, so you can verify that 9:00–11:00 AM in RET is 7:00–9:00 AM in Dubai, 10:30 AM–12:30 PM in Mumbai, and 6:00–8:00 AM in Paris during standard time, which helps confirm whether a morning call from Réunion is practical for all participants.
Export and share the result: After selecting the range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. For example, you can send an ICS file to a distributed operations team so each person sees the meeting in local time automatically, or copy the share link into Slack or email for a flight-planning or project-handoff discussion.
About Reunion Time (RET)
Reunion Time (RET) is the standard time zone used by Réunion, a French overseas department in the Indian Ocean east of Madagascar. RET is fixed at UTC+04:00, meaning local time in Réunion is always 4 hours ahead of Coordinated Universal Time (UTC).
Because RET is a fixed-offset time zone, it does not alternate between summer and winter clocks. When it is 12:00 noon UTC, it is 4:00 PM in Réunion. This makes RET straightforward for international scheduling compared with time zones that shift seasonally.
The primary region using RET is Réunion, whose largest city is Saint-Denis, the island’s administrative capital. Réunion has a population of roughly 870,000 people, and its economy includes public administration, tourism, transport, agriculture, and services, all of which rely on coordination with mainland France, nearby Mauritius, and global air routes through hubs such as Paris and Dubai.
RET shares the same UTC+04:00 offset as several other abbreviations at different times or in different regions, including AMT, AZT, GET, GST, KUYT, MSD, MUT, SAMT, and SCT. However, matching UTC offsets do not always mean the same legal time zone rules, especially where seasonal clock changes apply elsewhere, so using a city-based comparison is more reliable than relying only on abbreviations.
RET and Daylight Saving Time
RET does not observe Daylight Saving Time (DST). The offset remains UTC+04:00 all year, and there is no switch to a summer time or winter time variant.
For the current year, 2026, there are no DST transition dates for Reunion Time. That means RET does not move forward in March or October, does not switch to another abbreviation, and does not create seasonal one-hour scheduling shifts.
This fixed behavior is especially useful for recurring meetings with regions that do change clocks. For example, RET stays constant while Paris moves between CET (UTC+01:00) and CEST (UTC+02:00), so the time difference between Réunion and France changes seasonally: Réunion is 3 hours ahead of Paris during French winter time and 2 hours ahead during French summer time.
Frequently Asked Questions
What does RET stand for?
RET stands for Reunion Time, the standard local time used in Réunion, the French island territory in the Indian Ocean. It is a fixed-offset time zone set to UTC+04:00, so it remains four hours ahead of UTC throughout the year.
Is RET the same as GMT?
No. GMT is typically treated as UTC+00:00, while RET is UTC+04:00. That means RET is 4 hours ahead of GMT, so when it is 9:00 AM GMT, it is 1:00 PM RET.
Which cities use RET?
The main city associated with RET is Saint-Denis, the capital of Réunion, and the time zone applies across the island’s populated areas including Saint-Paul, Saint-Pierre, Le Tampon, and Saint-André. In practical terms, if you are scheduling anything anywhere on Réunion, RET is the time standard you should use.
What is the UTC offset for RET?
The UTC offset for Reunion Time is UTC+04:00. This means you add 4 hours to UTC to get local time in Réunion, so 3:30 PM UTC becomes 7:30 PM RET.
When does RET change?
RET does not change during the year because Réunion does not use Daylight Saving Time. In 2026, there are no clock changes, no spring-forward date, and no fall-back date, which makes recurring scheduling simpler than in Europe or North America.
Is RET the same as UTC+4?
Yes, RET is a UTC+4 time zone. However, not every UTC+4 abbreviation refers to Réunion, so for travel bookings, meeting planning, and calendar exports, it is safer to use Réunion or a city on the island rather than relying only on the abbreviation.
How far ahead is RET compared with Paris?
RET is not always the same distance ahead of Paris because France observes DST and Réunion does not. Réunion is 3 hours ahead of Paris when France is on CET (UTC+01:00) and 2 hours ahead when France is on CEST (UTC+02:00), which matters for government coordination, business calls, and airline itineraries.
Is RET used in mainland France?
No, RET is not used in mainland France. Mainland France uses Central European Time (CET, UTC+01:00) in winter and Central European Summer Time (CEST, UTC+02:00) in summer, while Réunion stays on RET, UTC+04:00 all year.