Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Eastern European Summer Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
Last Sunday in March at 03:00 AM EET (Clocks advance to EEST, UTC+3)
⬇️ Fall Back (Clocks Return)
Last Sunday in October at 04:00 AM EEST (Clocks return to EET, UTC+2)
Observing Jurisdictions & Subdivisions
14 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under EEST:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Moves Eastern European bourses to UTC+3, sharing the same hour with financial desks in Moscow and Riyadh from March to October.
Local Hours: 10:00 - 17:20 EEST
UTC Window: 06:00 - 14:30 UTC
Local Hours: 10:00 - 18:30 EEST
UTC Window: 06:00 - 14:30 UTC
Major Cities in EEST
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1981
Standardized across European Union member states under common daylight directives in 1981. Because Finland extends above the Arctic Circle, summer daylight lasts around the clock in places like Utsjoki for over two months straight.
In Helsinki, midsummer nights never reach true darkness; even after midnight, the sky stays in civil twilight, leaving streetlights switched off across the capital.
Frequently Asked Questions about EEST
What does EEST stand for?
EEST stands for Eastern European Summer Time, running at UTC+3 during daylight saving season.
When does EEST begin and end?
EEST starts on the last Sunday of March and ends on the last Sunday of October.
How does EEST compare to London time?
EEST is two hours ahead of British Summer Time (BST). When it is 10:00 AM in London, it is 12:00 PM in Helsinki and Athens.