Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Chicago to Buenos Aires

+2h

Chicago

CDTSOURCE

USA · UTC-05:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Buenos Aires

ART

Argentina · UTC-03:00

HH02

MM00

14:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Chicago

Buenos Aires

12:00 AM

2:00 AM

4:00 AM

6:00 AM

8:00 AM

10:00 AM

12:00 PM

2:00 PM

4:00 PM

6:00 PM

8:00 PM

10:00 PM

12:00 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

CDT and ART on the World Map

The map below highlights the CDT (Central Standard Time) and ART (Argentina Time) timezone regions across the globe.

CDT Zone

→

ART Zone

Explore all world timezones interactively →

CST – Central Standard Time

UTC-06:00

Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.

Countries in CST

United States (Central)Canada (Manitoba, Saskatchewan)MexicoGuatemalaHondurasEl SalvadorCosta RicaNicaraguaBelize

Major Cities in CST

ChicagoHoustonDallasSan AntonioMexico CityAustinWinnipegMemphisMilwaukeeNashvilleKansas CityNew OrleansMinneapolisGuatemala City

Key Facts about CST

•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.

Daylight Saving:Yes – switches to CDT

Learn more about CST on Wikipedia

ART – Argentina Time

UTC-03:00

Argentina Time (ART) is the standard time for Argentina, 3 hours behind UTC.

Countries in ART

Argentina

Major Cities in ART

Buenos AiresCórdobaRosarioMendozaLa PlataTucumán

Key Facts about ART

•Argentina does not observe daylight saving time.
•Buenos Aires is one of the most visited cities in South America.
•ART is the same offset as BRT (UTC-03:00).

Daylight Saving:No – UTC-03:00 year-round

Learn more about ART on Wikipedia

About Chicago

Wikipedia

Chicago operates on Central Time (CST/CDT), 1 hour behind New York. Home to CME and CBOE, Chicago is a global center for derivatives trading.

Population:2.7 million

Metro:9.5 million

Business Hours:8:00 AM - 5:00 PM CST

Currency:USD ($)

Stock Exchange:CME (Chicago Mercantile Exchange), CBOE

Key Landmarks

Willis TowerMillennium ParkCloud Gate (The Bean)Navy PierArt Institute of Chicago

Did You Know?

The Chicago Board of Trade is the world's oldest futures and options exchange.

Learn more about CDT timezone →

About Buenos Aires

Wikipedia

Buenos Aires operates on Argentina Time (ART), UTC-3. As South America's most European city, Buenos Aires coordinates with Brazilian markets in the same timezone.

Population:3 million

Metro:15.4 million

Business Hours:9:00 AM - 6:00 PM ART

Currency:ARS ($)

Stock Exchange:BCBA (Buenos Aires Stock Exchange)

Key Landmarks

Casa RosadaTeatro ColónLa BocaRecoleta CemeteryObelisco

Did You Know?

The Teatro Colón is considered one of the best opera houses in the world for acoustics.

Learn more about ART timezone →

Chicago to Buenos Aires Time Difference – Complete Guide

Chicago runs on Central Daylight Time (CDT) at UTC-05:00, currently observing daylight saving time. Buenos Aires runs on Argentina Standard Time (ART) at UTC-03:00. That puts Chicago 2 hours ahead of Buenos Aires — a difference of +2h at the current offsets.

In practice, when it is 9:00 AM in Chicago it is 11:00 AM in Buenos Aires. Midnight in Chicago is 2:00 AM in Buenos Aires.Chicago observes daylight saving time while Buenos Aires does not, so the gap narrows or widens by an hour part of the year.

Chicago to Buenos Aires time conversion table

Chicago (CDT)	Buenos Aires (ART)	Day
12:00 AM	2:00 AM	same day
6:00 AM	8:00 AM	same day
7:00 AM	9:00 AM	same day
8:00 AM	10:00 AM	same day
9:00 AM	11:00 AM	same day
12:00 PM	2:00 PM	same day
3:00 PM	5:00 PM	same day
5:00 PM	7:00 PM	same day
6:00 PM	8:00 PM	same day
9:00 PM	11:00 PM	same day

Why people convert Chicago to Buenos Aires time

Scheduling a call from Chicago to Buenos Aires: a 10:00 AM start in Chicago lands at 12:00 PM in Buenos Aires, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Chicago and Buenos Aires are inside the 9-to-5 working day between 9:00 AM and 3:00 PM CDT time (11:00 AM–5:00 PM ART). That is roughly 6 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Chicago is 10:00 PM in Buenos Aires makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM CDT" is unambiguous; "3 PM" across a +2h gap is not.
Block 9:00 AM–3:00 PM CDT as the recurring meeting window if you work primarily from Chicago and need Buenos Aires colleagues present.
Chicago: Clocks fall back on Sun, Nov 1, 2026. Re-check this page after that date because the offset changes and so does the +2h gap.

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.

About ART (Argentina Time)

Argentina Time (ART) is the time zone used throughout Argentina. Argentina does not observe daylight saving time. ART shares the same offset as Brasilia Time (BRT) and Uruguay's UYT.

Best time to call between Chicago and Buenos Aires

Both Chicago and Buenos Aires sit inside the 9 AM – 5 PM working day between 9:00 AM–3:00 PM CDT, which is 11:00 AM–5:00 PM ART. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Chicago and Buenos Aires share 6 hours of working-hours overlap (9:00 AM–3:00 PM CDT), so scheduling a live meeting is straightforward.

Chicago is 2 hours ahead of Buenos Aires (CDT UTC-05:00 → ART UTC-03:00). The shared working window is 9:00 AM–3:00 PM CDT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Chicago

☀ Currently in DST

Standard: UTC-06:00 · DST: UTC-05:00

Clocks fall back on Sun, Nov 1, 2026

Buenos Aires

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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Chicago and Buenos Aires?

Chicago (CDT, UTC-05:00) is 2 hours ahead of Buenos Aires (ART, UTC-03:00). The gap is currently +2h.

How do I convert Chicago time to Buenos Aires time?

Add +2h to Chicago local time. For example, 9:00 AM in Chicago is 11:00 AM in Buenos Aires.

What time is it in Buenos Aires right now?

Buenos Aires uses ART at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +2h offset from Chicago.

What is the best time to call Buenos Aires from Chicago?

Call between 9:00 AM and 3:00 PM CDT — that maps to 11:00 AM–5:00 PM ART and keeps both parties inside the working day.

Which is ahead, Chicago or Buenos Aires?

Chicago is 2 hours ahead of Buenos Aires. When it is 12:00 PM in Chicago it is 2:00 PM in Buenos Aires.

Do Chicago and Buenos Aires use different time zones?

Chicago (USA) uses CDT at UTC-05:00, while Buenos Aires (Argentina) uses ART at UTC-03:00. The IANA identifiers are America/Chicago and America/Buenos_Aires.

Does daylight saving time affect the Chicago–Buenos Aires difference?

Yes at the moment: Chicago is on daylight saving time and Buenos Aires is not, so the +2h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Chicago's time zone?

CDT also covers Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis and 6 more.

Which countries use CDT, Chicago's zone?

CDT is used in United States (Central), Canada (Manitoba, Saskatchewan), Mexico, Guatemala, Honduras, El Salvador, Costa Rica, Nicaragua and 1 more.

Is there a day difference between Chicago and Buenos Aires?

Not normally. The +2h gap only pushes the date over for late-evening times.

What is the time difference between Chicago and Buenos Aires?

Buenos Aires is +2h from Chicago.

What timezone is Chicago in?

Chicago operates on Central Time (CST/CDT), 1 hour behind New York. Home to CME and CBOE, Chicago is a global center for derivatives trading.

What timezone is Buenos Aires in?

Buenos Aires operates on Argentina Time (ART), UTC-3. As South America's most European city, Buenos Aires coordinates with Brazilian markets in the same timezone.

What are the business hours in Chicago?

Standard business hours in Chicago are 8:00 AM - 5:00 PM CST.

What are the business hours in Buenos Aires?

Standard business hours in Buenos Aires are 9:00 AM - 6:00 PM ART.

What is the best time to schedule a call between Chicago and Buenos Aires?

The best overlap for a call is when both cities are in business hours. Chicago works 8:00 AM - 5:00 PM CST and Buenos Aires works 9:00 AM - 6:00 PM ART (+2h difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Chicago and Buenos Aires?

Chicago uses USD ($) while Buenos Aires uses ARS ($). Check current exchange rates when planning travel or business between these cities.

How do Chicago and Buenos Aires compare in size?

Chicago has a population of approximately 2.7 million (metro: 9.5 million), while Buenos Aires has approximately 3 million (metro: 15.4 million).

What are the major landmarks in Chicago and Buenos Aires?

Chicago is known for Willis Tower, Millennium Park, Cloud Gate (The Bean). Buenos Aires is famous for Casa Rosada, Teatro Colón, La Boca.

Do Chicago and Buenos Aires have stock exchanges?

Yes. Chicago has the CME (Chicago Mercantile Exchange), CBOE and Buenos Aires has the BCBA (Buenos Aires Stock Exchange). The +2h time difference affects trading hour overlaps between these exchanges.