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DateAlmanac

What is Mexico City in AST?

Atlantic Time is 3 hours ahead

Central Time – Mexico is on UTC−6:00 and Atlantic Time is on UTC−3:00 right now. Atlantic Time is on daylight saving, so its clocks read ADT. The gap changes during the year — see below.

Time in Mexico City
6:55:21 AM
Time in Halifax
9:55:21 AM
Difference
+3 h
Next clock change
November 1, 2026

Convert a time

ADT — Atlantic Time

9:00 am

ADT, Fri

When the difference changes

Central Time – Mexico and Atlantic Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

  1. Now – October 31, 2026Atlantic Time is 3 hours ahead
  2. October 31, 2026 – March 14, 2027Atlantic Time is 2 hours ahead
  3. March 14, 2027 – onwardsAtlantic Time is 3 hours ahead

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

Central Time – Mexico

No clock changes

Central Time – Mexico stays on CST all year, so its offset from UTC never moves.

Atlantic Time

Sunday, November 1, 2026

Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.

Mexico City to AST conversion table

Every hour of Friday, September 25, 2026, converted from Central Time – Mexico to Atlantic Time. 3 of the 24 hours fall on a different calendar day in Halifax, which is marked.

12:00 am CST
3:00 am ADT
1:00 am CST
4:00 am ADT
2:00 am CST
5:00 am ADT
3:00 am CST
6:00 am ADT
4:00 am CST
7:00 am ADT
5:00 am CST
8:00 am ADT
6:00 am CST
9:00 am ADT
7:00 am CST
10:00 am ADT
8:00 am CST
11:00 am ADT
9:00 am CST
12:00 pm ADT
10:00 am CST
1:00 pm ADT
11:00 am CST
2:00 pm ADT
12:00 pm CST
3:00 pm ADT
1:00 pm CST
4:00 pm ADT
2:00 pm CST
5:00 pm ADT
3:00 pm CST
6:00 pm ADT
4:00 pm CST
7:00 pm ADT
5:00 pm CST
8:00 pm ADT
6:00 pm CST
9:00 pm ADT
7:00 pm CST
10:00 pm ADT
8:00 pm CST
11:00 pm ADT
9:00 pm CST
12:00 am ADT+1 day
10:00 pm CST
1:00 am ADT+1 day
11:00 pm CST
2:00 am ADT+1 day

Scheduling between the two

Working hours overlap from 9:00 am to 3:00 pm CST, which is 12:00 pm to 6:00 pm ADT. 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.

Central Time – Mexico (CST) is used in most of Mexico. Mexico abolished daylight saving in October 2022, so it no longer tracks US Central Time in summer.

Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico

Other conversions