Time Zone History

Bermuda time zone history

Clocks have been changed 106 times since 1970, the most of the 8 zones on Atlantic islands. On standard time, clocks in Bermuda run 19 minutes ahead of local mean solar time.

UTC−4

Standard time is UTC−4 (ADT/AST); clocks go forward to UTC−3 on the second Sunday in March and back on the first Sunday in November.

tz database name Atlantic/Bermuda

Convert a time from Bermuda

Summer time in 53 of 57 years since 1970

UTC−4:19:18: 19 minutes behind today’s standard timeUTC−4: today’s standard timeUTC−3:19:18: 41 minutes ahead of today’s standard timeUTC−3: 1 hour ahead of today’s standard timeUTC−4:19:18: 19 minutes behindtoday’s standard timeUTC−4: today’s standard timeUTC−3:19:18: 41 minutes ahead oftoday’s standard timeUTC−3: 1 hour ahead of today’sstandard time

How to read this chart

Before 1970

18801900192019401960188019201960
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
January 1, 1890Local mean time (UTC−4:19:18) replacedUTC−4:19:18BMT
January 1, 1930Standard time forward 19 minutesUTC−4AST

Daylight saving periods

YearsClocks go forwardClocks go backShift and labels
Before 1970
1917April 6October 11 hour, BMT to BST
1918April 14September 161 hour, BMT to BST
1942January 11October 181 hour, AST to ADT
1943March 21October 311 hour, AST to ADT
1944–1945second Sunday in March, 02:00first Sunday in November, 02:001 hour, AST to ADT
1947May 18September 141 hour, AST to ADT
1948–1952fourth Sunday in May, 02:00first Sunday in September, 02:001 hour, AST to ADT
1956May 27October 281 hour, AST to ADT
Since 1970
1974–1986last Sunday in April, 02:00last Sunday in October, 02:001 hour, AST to ADT
1987–2006first Sunday in April, 02:00last Sunday in October, 02:001 hour, AST to ADT
2007–2037second Sunday in March, 02:00first Sunday in November, 02:001 hour, AST to ADT

Clock changes in 2026, 2027 and 2028

The clocks go forward 1 hour (AST to ADT) on March 8, 2026, March 14, 2027 and March 12, 2028 at 02:00 and back 1 hour (ADT to AST) on November 1, 2026, November 7, 2027 and November 5, 2028 at 02:00, local time.

Also on UTC−4

Halifax (Canada), Moncton (Canada), Puerto Rico, Glace Bay (Canada), Dominican Republic, Martinique, Barbados, Goose Bay (Canada), Venezuela and Guyana (nearest first; 8 more on the list of offsets).

Clocks next door since 1970

  • New York (United States) (1,248 km): usually 1 hour behind; different on 914 days in 1970–2026.
  • Turks and Caicos Islands (1,358 km): usually 1 hour behind; different on 1,313 days in 1974–2026.
  • Halifax (Canada) (1,379 km): same time except 735 days in 1970–1973.
  • Moncton (Canada) (1,536 km): same time except 555 days in 1970–1972 and 1993–2006.
  • Puerto Rico (1,542 km): usually 1 hour behind; different on 9,523 days in 1970–2026; same time today.

How it compares

Under the current rules, summer time lasts 238 days in 2027, the longest of the 5 zones on Atlantic islands with summer time.

Clocks were first moved for daylight saving in 1917, the second-earliest start of the 17 zones on UTC−4 standard time that ever used daylight saving time.

Standard time has stayed at UTC−4 since 1930.