AST to Mexico City
-2hAST
ASTSOURCEMexico City
CSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and CST on the World Map
The map below highlights the AST (Atlantic Standard Time) and CST (Central Standard Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
About Mexico City
WikipediaMexico City operates on Central Time (CST/CDT), same as Chicago. As North America's largest city, Mexico City bridges US and Latin American business hours.
Mexico City is the oldest capital city in the Americas.
Everything You Need to Know About AST and Mexico City Time
AST runs on Atlantic Standard Time (AST) at UTC-04:00. Mexico City runs on Central Standard Time (CST) at UTC-06:00. That puts AST 2 hours behind Mexico City — a difference of -2h at the current offsets.
In practice, when it is 9:00 AM in AST it is 7:00 AM in Mexico City. Midnight in AST is 10:00 PM in Mexico City. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to Mexico City time conversion table
| AST (AST) | Mexico City (CST) | Day |
|---|---|---|
| 12:00 AM | 10:00 PM | previous day |
| 6:00 AM | 4:00 AM | same day |
| 7:00 AM | 5:00 AM | same day |
| 8:00 AM | 6:00 AM | same day |
| 9:00 AM | 7:00 AM | same day |
| 12:00 PM | 10:00 AM | same day |
| 3:00 PM | 1:00 PM | same day |
| 5:00 PM | 3:00 PM | same day |
| 6:00 PM | 4:00 PM | same day |
| 9:00 PM | 7:00 PM | same day |
Why people convert AST to Mexico City time
- Scheduling a call from AST to Mexico City: a 10:00 AM start in AST lands at 8:00 AM in Mexico City, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and Mexico City are inside the 9-to-5 working day between 11:00 AM and 5:00 PM AST time (9:00 AM–3:00 PM CST). That is roughly 6 hours of usable overlap.
- Coordinating a AST-based team with Mexico City contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a -2h gap is not.
- Block 11:00 AM–5:00 PM AST as the recurring meeting window if you work primarily from AST and need Mexico City colleagues present.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
About CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between AST and Mexico City
Both AST and Mexico City sit inside the 9 AM – 5 PM working day between 11:00 AM–5:00 PM AST, which is 9:00 AM–3:00 PM CST. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and Mexico City share 6 hours of working-hours overlap (11:00 AM–5:00 PM AST), so scheduling a live meeting is straightforward.
AST is 2 hours behind Mexico City (AST UTC-04:00 → CST UTC-06:00). The shared working window is 11:00 AM–5:00 PM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
Mexico City
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AST and Mexico City?
AST (AST, UTC-04:00) is 2 hours behind Mexico City (CST, UTC-06:00). The gap is currently -2h.
How do I convert AST time to Mexico City time?
Add -2h to AST local time. For example, 9:00 AM in AST is 7:00 AM in Mexico City.
What time is it in Mexico City right now?
Mexico City uses CST at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h offset from AST.
What is the best time to call Mexico City from AST?
Call between 11:00 AM and 5:00 PM AST — that maps to 9:00 AM–3:00 PM CST and keeps both parties inside the working day.
Which is behind, AST or Mexico City?
AST is 2 hours behind Mexico City. When it is 12:00 PM in AST it is 10:00 AM in Mexico City.
Do AST and Mexico City use different time zones?
AST uses AST at UTC-04:00, while Mexico City (Mexico) uses CST at UTC-06:00. The IANA identifiers are America/Halifax and America/Mexico_City.
Does daylight saving time affect the AST–Mexico City difference?
Neither zone observes daylight saving time, so the -2h offset between AST and Mexico City is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and Mexico City?
Not normally. The -2h gap only pushes the date over the previous day.
What is the time difference between AST and Mexico City?
Mexico City is -2h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is Mexico City in?
Mexico City operates on Central Time (CST/CDT), same as Chicago. As North America's largest city, Mexico City bridges US and Latin American business hours.
What are the business hours in Mexico City?
Standard business hours in Mexico City are 9:00 AM - 6:00 PM CST.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in AST, what time is it in Mexico City?
When it is 12:00 AM (midnight) in AST (AST), it is -2h later in Mexico City (CST).
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