Current Time in Dublin
Ireland — Europe/Dublin
About Time in Dublin
Dublin operates on Greenwich Mean Time (IANA: Europe/Dublin). During standard time, this is GMT at UTC+0, shifting to Irish Standard Time (IST) at UTC+1 from the last Sunday of March to the last Sunday of October. While Ireland and the UK switch clocks on the same dates, Ireland's summer time is technically called IST rather than BST, reflecting the country's independent legal framework.
Dublin is on the same time as London year-round and 5 hours ahead of New York during EST. It is 1 hour behind Paris and Berlin, and 9 hours behind Tokyo. Dublin's GMT/IST timezone makes it the westernmost major city in the UTC+0/UTC+1 zone, with its longitude of 6.3 W actually placing it west of many UTC+0 cities.
Dublin's GMT timezone has been a significant factor in its emergence as a European tech hub. Major US technology companies — including Google, Facebook (Meta), Apple, Microsoft, and Amazon — have established their European headquarters in Dublin, partly because GMT provides the best timezone overlap with the US East Coast (5 hours difference) among EU member states. This 'time zone advantage,' combined with Ireland's favorable corporate tax rates and English-speaking workforce, has made Dublin a critical node in global tech operations.
Time Facts
Ireland technically defines its standard time as IST (Irish Standard Time, UTC+1 in summer) and treats winter time as the exception, the inverse of most European countries — though the practical effect is identical to the UK's GMT/BST system.
Dunsink Observatory near Dublin was the original reference point for Dublin Mean Time (DMT), which was 25 minutes and 21 seconds behind GMT. Ireland used DMT until 1916, when it switched to GMT.
Dublin's Temple Bar district is famous for pub closing times that have historically been set by law — currently 11:30 PM on weeknights and 12:30 AM on weekends (IST/GMT), a regulation that has been gradually relaxed over the decades.
Google's European headquarters in Dublin processes timezone-sensitive operations for the entire EMEA region, making the 4 PM GMT/IST end of Dublin's business day the effective cutoff for same-day European decisions across much of the tech industry.
Business Hours
Standard business hours in Dublin are 9:00 AM to 5:30 PM GMT (09:00-17:30 UTC during GMT, 08:00-16:30 UTC during IST).