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America/Halifax

America/Halifax is the IANA time zone for Atlantic – NS (most areas), PE in Canada.

UTC−03:00

Tue, Sep 29 UTC−3 ADT

Offsets and daylight saving time

Standard offset
UTC−04:00
Daylight offset
UTC−03:00
Rule
Daylight saving time from the second Sunday in March at 02:00 to the first Sunday in November at 02:00 (local time).

Next clock changes

  • Sunday, November 1, 2026 at 02:00: back to UTC−4 (ADT → AST)
  • Sunday, March 14, 2027 at 02:00: forward to UTC−3 (AST → ADT)

Names

Generic name
Atlantic Time
Abbreviation
AST / ADT
Standard / daylight
Atlantic Standard Time / Atlantic Daylight Time
Aliases
Canada/Atlantic (old ids that resolve to America/Halifax)

Use it in code

// JavaScript
new Intl.DateTimeFormat('en-US', { timeZone: 'America/Halifax' })

# Python
from zoneinfo import ZoneInfo
ZoneInfo('America/Halifax')

-- PostgreSQL
SELECT now() AT TIME ZONE 'America/Halifax';

Cities in America/Halifax

Also in this zone: Dartmouth, Charlottetown.

Offset history since 1970

  • 1970–2026: UTC−4 and UTC−3 each year

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