In Ireland, Greenwich Mean Time (GMT) is observed during the winter, similar to the United Kingdom. In the summer, Irish Standard Time (IST) is observed, which is one hour ahead of Greenwich Mean Time (GMT+1), aligning with Central European Winter Time.
Note that unlike the United Kingdom, which refers to it as Daylight Saving Time (British Summer Time, BST), the summer in Ireland is referred to as Standard Time!
The "Standard Time Act" of 1968 in Ireland stipulates that the national standard time should be one hour ahead of Greenwich Mean Time (GMT). Through an amendment in 1971, Greenwich Mean Time was designated as Irish Winter Time, while Irish Standard Time is observed in the summer. Therefore, the time in Ireland during winter is one hour behind Standard Time and reverts to Standard Time in the summer.
This differs from other EU countries, which operate their summer time one hour ahead of Standard Time, but yield the same final result. That is to say, when it is 1:00 AM Greenwich Mean Time in winter, it is 1:00 AM Winter Time in Ireland, while most of continental Europe is at 2:00 AM Standard Time; in summer, the United Kingdom is at 2:00 PM Daylight Saving Time, Ireland is at 2:00 PM Standard Time, and continental Europe is at 3:00 PM Daylight Saving Time.
In summary, although the names differ, there is no time difference between Ireland and the United Kingdom, while there is a one-hour time difference with most countries in continental Europe.
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