Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Reunion Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
2 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under RET:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Coordinates Indian Ocean sugarcane export, volcanic tourism, and French naval operations.
Local Hours: 08:30 - 16:30 RET
UTC Window: 04:30 - 12:30 UTC
Major Cities in RET
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1911
Reunion adopted UTC+4 in 1911 under French decree, standardizing with neighboring Mauritius.
Piton de la Fournaise on Reunion is one of the world's most active shield volcanoes, monitored continuously on RET.
Frequently Asked Questions about RET
What is Reunion Time?
Reunion Time (RET) is UTC+4, observed on the French island of Reunion.
Does Reunion observe daylight saving like France?
No. Reunion stays on UTC+4 all year without clock changes.
What is the time difference between Paris and Reunion?
Reunion is 3 hours ahead of Paris in winter (CET) and 2 hours ahead in summer (CEST).