What is AST in EST?
Eastern Time is 1 hour behind
Atlantic Time is on UTC−3:00 and Eastern Time is on UTC−4:00 right now. Both are on daylight saving, so their clocks read ADT and EDT. That gap holds all year, because both zones change their clocks together.
- Time in Halifax
- 10:33 pm
- Time in New York
- 9:33 pm
- Difference
- −1 h
- Next clock change
- November 1, 2026
Convert a time
EDT — Eastern Time
9:00 pm
Tue
Daylight saving
Atlantic Time
Clocks go back one hour at 2am local time, becoming AST.
Eastern Time
Clocks go back one hour at 2am local time, becoming EST.
AST to EST conversion table
Every hour of Tuesday, September 22, 2026, converted from Atlantic Time to Eastern Time. 1 of the 24 hours fall on a different calendar day in New York, which is marked.
- 12:00 am ADT
- 11:00 pm EDT−1 day
- 1:00 am ADT
- 12:00 am EDT
- 2:00 am ADT
- 1:00 am EDT
- 3:00 am ADT
- 2:00 am EDT
- 4:00 am ADT
- 3:00 am EDT
- 5:00 am ADT
- 4:00 am EDT
- 6:00 am ADT
- 5:00 am EDT
- 7:00 am ADT
- 6:00 am EDT
- 8:00 am ADT
- 7:00 am EDT
- 9:00 am ADT
- 8:00 am EDT
- 10:00 am ADT
- 9:00 am EDT
- 11:00 am ADT
- 10:00 am EDT
- 12:00 pm ADT
- 11:00 am EDT
- 1:00 pm ADT
- 12:00 pm EDT
- 2:00 pm ADT
- 1:00 pm EDT
- 3:00 pm ADT
- 2:00 pm EDT
- 4:00 pm ADT
- 3:00 pm EDT
- 5:00 pm ADT
- 4:00 pm EDT
- 6:00 pm ADT
- 5:00 pm EDT
- 7:00 pm ADT
- 6:00 pm EDT
- 8:00 pm ADT
- 7:00 pm EDT
- 9:00 pm ADT
- 8:00 pm EDT
- 10:00 pm ADT
- 9:00 pm EDT
- 11:00 pm ADT
- 10:00 pm EDT
Scheduling between the two
Working hours overlap from 10:00 am to 6:00 pm ADT, which is 9:00 am to 5:00 pm EDT. Anything inside that window falls in the normal working day at both ends.
A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico
Eastern Time (EDT) is used in Toronto, Atlanta, Miami, Detroit and most of the US east coast