Time Zone History

Moncton time zone history

Moncton left local mean time (UTC−4:19:08) in 1883, the earliest switch of the 15 zones in Canada with local mean time in the record. On standard time, clocks in Moncton 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.

Covers: New Brunswick · tz database name America/Moncton

Convert a time from Moncton

Summer time in 56 of 57 years since 1970

UTC−5: 1 hour behind today’s standard timeUTC−4:19:08: 19 minutes behind today’s standard timeUTC−4: today’s standard timeUTC−3: 1 hour ahead of today’s standard timeUTC−5: 1 hour behind today’sstandard timeUTC−4:19:08: 19 minutes behindtoday’s standard timeUTC−4: today’s standard timeUTC−3: 1 hour ahead of today’sstandard time

How to read this chart

Before 1970

187018901910193019501970187019101950
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
December 9, 1883Local mean time (UTC−4:19:08) replacedUTC−5EST
June 15, 1902Standard time forward 1 hourUTC−4AST

Daylight saving periods

YearsClocks go forwardClocks go backShift and labels
Before 1970
1918April 14October 271 hour, AST to ADT
1933–1935second Sunday in June, 01:00second Sunday in September, 01:001 hour, AST to ADT
1936–1938first Sunday in June, 01:00first Sunday in September, 01:001 hour, AST to ADT
1939May 27September 231 hour, AST to ADT
1940May 19September 211 hour, AST to ADT
1941May 4September 271 hour, AST to ADT
1942February 9not that year1 hour, AST to AWT
1945not that yearSeptember 301 hour
1946–1956last Sunday in April, 02:00last Sunday in September, 02:001 hour, AST to ADT
1957–1972last Sunday in April, 02:00last Sunday in October, 02:001 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), Glace Bay (Canada), Goose Bay (Canada), Bermuda, Puerto Rico, Dominican Republic, Pituffik (Thule) (Greenland), Martinique, Barbados and Venezuela (nearest first; 8 more on the list of offsets).

Clocks next door since 1970

  • Halifax (186 km): same time except 184 days in 1973 and 1993–2006.
  • Glace Bay (372 km): same time except 555 days in 1970, 1971, 1973 and 1993–2006.
  • Saint Pierre and Miquelon (654 km): usually 1 hour ahead; different on 5,060 days in 1970–2026.
  • Goose Bay (863 km): same time except 394 days in 1973, 1987–1992 and 2007–2011.
  • St. John’s (931 km): usually 30 minutes ahead; different on 396 days in 1970–2026.

How it compares

Standard time has stayed at UTC−4 since 1902.