Time Zone History

Ireland time zone history

On standard time, clocks at Dublin run 1 hour 25 minutes ahead of local mean solar time, the largest gap of the 31 zones in Europe whose clocks run ahead of the sun. Local mean time, UTC−0:25:21, ended in 1880.

UTC+1

Standard time is UTC+1 (GMT/IST); clocks go back to UTC+0 on the last Sunday in October and forward again on the last Sunday in March.

tz database name Europe/Dublin

Convert a time from Ireland

Summer time in 56 of 57 years since 1970

UTC−0:25:21, UTC+0: behind today’s standard timeUTC+0:34:39: 25 minutes behind today’s standard timeUTC+1: today’s standard timeUTC−0:25:21, UTC+0: behind today’sstandard timeUTC+0:34:39: 25 minutes behindtoday’s standard timeUTC+1: today’s standard time

How to read this chart

Before 1970

187018901910193019501970187019101950
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
August 2, 1880Local mean time (UTC−0:25:21) replacedUTC−0:25:21DMT
October 1, 1916Standard time forward 25 minutesUTC+0GMT
October 27, 1968Summer offset kept as standard time; clocks did not moveUTC+1IST

Daylight saving periods

YearsClocks go forwardClocks go backShift and labels
Before 1970
1916May 21not that year1 hour, DMT to IST
1917April 8September 171 hour, GMT to BST
1918March 24September 301 hour, GMT to BST
1919March 30September 291 hour, GMT to BST
1920March 28October 251 hour, GMT to BST
1921April 3October 31 hour, GMT to BST
1922March 26October 81 hour, GMT to IST
1923April 22September 161 hour, GMT to IST
1924April 13September 211 hour, GMT to IST
1925April 19September 201 hour, GMT to IST
1926April 18October 31 hour, GMT to IST
1927April 10October 21 hour, GMT to IST
1928April 22October 71 hour, GMT to IST
1929April 21October 61 hour, GMT to IST
1930April 13October 51 hour, GMT to IST
1931–1932third Sunday in April, 02:00first Sunday in October, 03:001 hour, GMT to IST
1933April 9October 81 hour, GMT to IST
1934April 22October 71 hour, GMT to IST
1935April 14October 61 hour, GMT to IST
1936–1937third Sunday in April, 02:00first Sunday in October, 03:001 hour, GMT to IST
1938April 10October 21 hour, GMT to IST
1939April 16November 191 hour, GMT to IST
1940February 25not that year1 hour, GMT to IST
1946not that yearOctober 61 hour
1947March 16November 21 hour, GMT to IST
1948April 18October 311 hour, GMT to IST
1949April 3October 301 hour, GMT to IST
1950April 16October 221 hour, GMT to IST
1951April 15October 211 hour, GMT to IST
1952April 20October 261 hour, GMT to IST
1953April 19October 41 hour, GMT to IST
1954April 11October 31 hour, GMT to IST
1955April 17October 21 hour, GMT to IST
1956April 22October 71 hour, GMT to IST
1957April 14October 61 hour, GMT to IST
1958–1959third Sunday in April, 02:00first Sunday in October, 03:001 hour, GMT to IST
1960April 10October 21 hour, GMT to IST
1961–1963last Sunday in March, 02:00last Sunday in October, 03:001 hour, GMT to IST
1964March 22October 251 hour, GMT to IST
1965–1966third Sunday in March, 02:00fourth Sunday in October, 03:001 hour, GMT to IST
1967March 19October 291 hour, GMT to IST
1968February 18not that year1 hour, GMT to IST
Since 1970
1971not that yearOctober 311 hour
1972–1975third Sunday in March, 02:00last Sunday in October, 03:001 hour, GMT to IST
1976–1977third Sunday in March, 02:00fourth Sunday in October, 03:001 hour, GMT to IST
1978–1980third Sunday in March, 02:00last Sunday in October, 03:001 hour, GMT to IST
1981–1988last Sunday in March, 01:00fourth Sunday in October, 02:001 hour, GMT to IST
1989–1992last Sunday in March, 01:00last Sunday in October, 02:001 hour, GMT to IST
1993–1998last Sunday in March, 01:00fourth Sunday in October, 02:001 hour, GMT to IST
1999–2037last Sunday in March, 01:00last Sunday in October, 02:001 hour, GMT to IST

Clock changes in 2026, 2027 and 2028

The clocks go forward 1 hour (GMT to IST) on March 29, 2026, March 28, 2027 and March 26, 2028 at 01:00 and back 1 hour (IST to GMT) on October 25, 2026, October 31, 2027 and October 29, 2028 at 02:00, local time.

Also on UTC+1

Belgium, France, Switzerland, Germany, Andorra, Madrid (Spain), Czech Republic, Austria, Poland and Italy (nearest first; 10 more on the list of offsets).

Clocks next door since 1970

  • United Kingdom (462 km): same time every day; 1 hour behind today.
  • Belgium (774 km): usually 1 hour ahead; different on 2,383 days in 1970–1995; same time today.
  • France (777 km): usually 1 hour ahead; different on 2,201 days in 1970–1995; same time today.
  • Faroe Islands (966 km): same time except 3,097 days in 1970–1995; 1 hour behind today.
  • Switzerland (1,236 km): usually 1 hour ahead; different on 3,097 days in 1970–1995; same time today.

How it compares

Standard time has stayed at UTC+1 since 1968.

Clocks have been changed 111 times since 1970, the third-most of the 21 zones on UTC+1 standard time.