2027 time change dates for Ireland
At 1:00 AM the clocks jump straight to 2:00 AM in Ireland. That hour never happens, and everyone loses an hour of sleep.
At 2:00 AM the clocks return to 1:00 AM, so that hour is lived through twice and the night is an hour longer.
Ireland keeps GMT in winter and shifts one hour forward for the summer.
Countdown to the next change
Economic Impact of DST in Ireland
The economic effects of Daylight Saving Time in Ireland are real but modest, and studies disagree on their size. Retailers and hospitality businesses generally favour DST, arguing that lighter evenings encourage shopping, dining out and other after-work spending — the US retail lobby was one of the main forces behind the 2005 extension of the DST period.
The transitions themselves carry a cost. Research from Chmura Economics has put the one-off economic cost of the spring change in the United States at roughly $430 million a year, driven by lost productivity, workplace injuries and the health effects of a disrupted night's sleep.
Technology and Time Changes in 2027
Phones, computers and anything else that syncs with an internet time server handle the transition on their own. What still catches people out in Ireland is the long tail of devices that don't: car dashboards, ovens and microwaves, wall clocks, older thermostats, and cheap alarm clocks with a DST setting hard-coded to a schedule that has since changed.
For anyone running servers, the transitions are a recurring source of bugs — duplicated or missing local timestamps around the changeover, cron jobs that fire twice or not at all, and stale operating system timezone databases. Storing timestamps in UTC and keeping the tzdata package current avoids almost all of it.
Background
- Russia experimented with permanent summer time from 2011 to 2014 before settling on permanent standard time.
- The spring transition is associated with a measurable short-term rise in heart attacks and fatal traffic crashes, an effect researchers attribute to the lost hour of sleep rather than the clock itself.
- Benjamin Franklin is often credited with inventing DST, but his 1784 essay was satire — he joked that Parisians could save candles by waking earlier. The modern proposal came from New Zealander George Hudson in 1895 and Briton William Willett in 1907.
Tips for Ireland
Remember that not all countries change on the same date - check international meeting times carefully.
Check and replace smoke detector batteries when changing clocks - it's a good reminder!
Consider the time change when scheduling meetings with people in other time zones.
Set your clocks before going to bed to avoid confusion in the morning.
Frequently asked questions
When do the clocks change in Ireland in 2027?
Clocks go forward on Sunday, March 28, 2027 and back on Sunday, October 31, 2027.
Which way do the clocks go?
"Spring forward, fall back" is the usual mnemonic: forward one hour in spring, back one hour in autumn.
Do I have to change anything myself?
Phones, computers and anything that syncs over the internet update on their own. Car clocks, ovens, microwaves and older wall clocks generally do not.
Is Daylight Saving Time being scrapped?
It has been proposed in many places and adopted in few. The European Parliament voted in 2019 to end mandatory clock changes and the change has stalled; in the United States the Sunshine Protection Act has repeatedly passed the Senate without becoming law. Most of the world that changes its clocks is still changing them.