Atlantic Time (AT) or the Atlantic Time Zone. This can add a bit of confusion as the term Atlantic Time does not differentiate between standard time and Daylight Saving Time, so Atlantic Time switches between AST and ADT in areas that use DST during part of the year.

Most North American time zones have generic terms, including Pacific Time (PT), Mountain Time (MT), Central Time (CT), and Eastern Time (ET).

Converting Atlantic Daylight Time to Other US Time Zones

• Atlantic Daylight Time (ADT) is 1 hour ahead of Eastern Daylight Time (EDT).
  To convert ADT to EDT, you have to subtract one hour.
• Atlantic Daylight Time (ADT) is 2 hours ahead of Central Daylight Time (CDT).
  To convert ADT to CDT, you have to subtract two hours.
• Atlantic Daylight Time (ADT) is 3 hours ahead of Mountain Daylight Time (MDT).
  To convert ADT to MDT, you have to subtract three hours.
• Atlantic Daylight Time (ADT) is 4 hours ahead of Pacific Daylight Time (PDT).
  To convert ADT to PDT, you have to subtract four hours.

Time Zone Converter: UTC to ADT

Where and When is ADT Observed?

North America

Atlantic

Other Time Zones in UTC -3

Some time zones exist that have the same offset as ADT, but can be found under a different name:

• AMST – Amazon Summer Time
• ART – Argentina Time
• BRT – Brasília Time
• CLST – Chile Summer Time
• FKST – Falkland Islands Summer Time
• GFT – French Guiana Time
• P – Papa Time Zone
• PMST – Pierre & Miquelon Standard Time
• PYST – Paraguay Summer Time
• PYT – Paraguay Time
• ROTT – Rothera Time
• SRT – Suriname Time
• UYT – Uruguay Time
• WARST – Western Argentine Summer Time

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