Time in the Republic of Ireland

Ireland uses Irish Standard Time (IST, UTC+01:00; Irish: Am Caighdeánach Éireannach) in the summer months and Greenwich Mean Time (UTC+00:00; Meán-Am Greenwich) in the winter period.[1] (Roughly half of the state is in the 7.5°W to 22.5°W sector, half is in the same sector as Greenwich: 7.5°E to 7.5°W).

Time in Europe:
Western European Time / Greenwich Mean Time (UTC)
Western European Time / Greenwich Mean Time (UTC)
Western European Summer Time / British Summer Time / Irish Standard Time (UTC+1)
Central European Time (UTC+1)
Central European Summer Time (UTC+2)
Eastern European Time / Kaliningrad Time (UTC+2)
Eastern European Time (UTC+2)
Eastern European Summer Time (UTC+3)
Moscow Time / Turkey Time (UTC+3)
pale colours indicate where standard time is observed all year; dark colours indicate where a summer time is observed

In Ireland, the Standard Time Act 1968 legally established that the time for general purposes in the State (to be known as standard time) shall be one hour in advance of Greenwich mean time throughout the year.[2] This act was amended by the Standard Time (Amendment) Act 1971, which legally established Greenwich Mean Time as a winter time period.[1] Ireland therefore operates one hour behind standard time during the winter period, and reverts to standard time in the summer months. This is defined in contrast to the other states in the European Union, which operate one hour ahead of standard time during the summer period, but produces the same end result.

The instant of transition to and from daylight saving time is synchronised across Europe. In Ireland, winter time begins at 02:00 IST on the last Sunday in October (changing the clocks to 01:00 GMT), and ends at 01:00 GMT on the last Sunday in March (changing to 02:00 IST).[3][4]

The following table lists recent past and near-future starting and ending dates of Irish Standard Time or Irish Summer Time (use of DST beyond 2019 is under discussion, see below):

Year Start End
2018 25 March 28 October
2019 31 March 27 October
2020 29 March 25 October
2021 28 March 31 October
2022 27 March 30 October
2023 26 March 29 October
2024 31 March 27 October
2025 30 March 26 October