Reunion is a French island in the Indian Ocean, roughly 700 kilometers east of Madagascar, and it runs on a clock four hours ahead of Paris. The IANA identifier is Indian/Reunion. UTC+4, no daylight saving.

France keeps Reunion on the same rules that apply to its other Indian Ocean territories: fixed offset, no DST, because at 21 degrees South latitude there is not enough seasonal variation in daylight to motivate clock changes.

The geography of UTC+4

Reunion sits at roughly 55 degrees East longitude. Solar noon occurs around 08:20 UTC, which at UTC+4 gives local noon at 12:20. The alignment is reasonable, slightly ahead of geographic solar time.

Reunion shares UTC+4 with nearby Mauritius, the Seychelles, and the UAE, though these countries are in different political contexts. For Reunion, being simultaneously a French department with the same administrative rules as metropolitan France and an island in a broadly Indian Ocean timezone creates a specific kind of temporal split: you are in France’s administrative time but not France’s solar time.

When it is noon in Reunion, it is 8:00 AM in Paris in winter, 9:00 AM in summer (because France observes DST, Reunion does not). Business with the mainland requires bridging this gap.

Piton de la Fournaise

Reunion is home to Piton de la Fournaise (Peak of the Furnace), one of the world’s most active volcanoes, erupting roughly twice per year on average. The volcano occupies the island’s southeastern shield and has been erupting continuously, in geological terms, for over 500,000 years.

Eruptions are usually effusive rather than explosive: lava flows rather than explosive blasts. This makes them dramatic to observe but generally not catastrophic. Volcanologists from around the world maintain instruments on the mountain through the Observatoire Volcanologique du Piton de la Fournaise.

The lava fields surrounding the volcano are among the most desolate landscapes in the world, vast black plains of solidified basalt that look like another planet. They are also, by geological standards, extremely recent: some flows are only decades old.

Creole culture and Reunionnais time

Reunion was uninhabited before European colonization in the 17th century. The French brought enslaved people from Madagascar, Mozambique, and elsewhere in Africa, then indentured laborers from India after abolition in 1848, and traders from China. The result is a society where African, Indian, Chinese, and European cultures have been mixing for centuries.

The Creole language of Reunion, Réunionnais, is a French-based creole with influences from Malagasy, Tamil, and other source languages. The cuisine, the music (sega and maloya), and the social calendar reflect this layering.

Time in Reunion has a texture shaped by this multicultural background: the Muslim Eid calendar, the Hindu Divali celebrations, the Catholic feast days, the Creole cultural festivals. The clock says UTC+4, but the year is organized by a more complex cultural timekeeping.

For developers

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