The island of Ireland functions on Greenwich Mean Time (GMT)
GMT is an absolute time reference and doesn't change with the seasons.
The time on the island of Ireland is the same as Greenwich Mean Time less than half of the year.
During the summer it becomes GMT+1, that's Irish Standard Time (IST) in the Republic and British Summer Time (BST) in Northern Ireland.
BST and IST start from 01:00 GMT on the last Sunday of March until 01:00 GMT on the last Sunday of October.
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If you’re a visitor from the island of Ireland you may want to visit one of these sites… Otherwise proceed to Ireland.com