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 Johannesburg

+7h

Chicago

CDTSOURCE

USA · UTC-05:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Johannesburg

SAST

South Africa · UTC+02:00

HH07

MM00

19:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Chicago

Johannesburg

12:00 AM

7:00 AM

2:00 AM

9:00 AM

4:00 AM

11:00 AM

6:00 AM

1:00 PM

8:00 AM

3:00 PM

10:00 AM

5:00 PM

12:00 PM

7:00 PM

2:00 PM

9:00 PM

4:00 PM

11:00 PM

6:00 PM

1:00 AM+1

8:00 PM

3:00 AM+1

10:00 PM

5:00 AM+1

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

CDT and SAST on the World Map

The map below highlights the CDT (Central Standard Time) and SAST (South Africa Standard Time) timezone regions across the globe.

CDT Zone

→

SAST 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

SAST – South Africa Standard Time

UTC+02:00

South Africa Standard Time (SAST) is the time zone for South Africa and neighboring countries, 2 hours ahead of UTC.

Countries in SAST

South AfricaLesothoEswatini

Major Cities in SAST

JohannesburgCape TownDurbanPretoriaPort Elizabeth

Key Facts about SAST

•South Africa does not observe daylight saving time.
•SAST is the same offset as EET and Israel Standard Time.
•The Johannesburg Stock Exchange (JSE) is Africa's largest.

Daylight Saving:No – UTC+02:00 year-round

Learn more about SAST 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 Johannesburg

Wikipedia

Johannesburg operates on South Africa Time (SAST), UTC+2. As Africa's largest economy hub and home to the JSE, Johannesburg drives African financial markets.

Population:5.8 million

Metro:10.5 million

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

Currency:ZAR (R)

Stock Exchange:JSE (Johannesburg Stock Exchange)

Key Landmarks

Apartheid MuseumConstitution HillGold Reef CityMaboneng PrecinctSoweto

Did You Know?

Johannesburg is built on the world's largest gold deposit.

Learn more about SAST timezone →

Time Conversion Guide: Chicago to Johannesburg

Chicago runs on Central Daylight Time (CDT) at UTC-05:00, currently observing daylight saving time. Johannesburg runs on South Africa Standard Time (SAST) at UTC+02:00. That puts Chicago 7 hours ahead of Johannesburg — a difference of +7h at the current offsets.

In practice, when it is 9:00 AM in Chicago it is 4:00 PM in Johannesburg. Midnight in Chicago is 7:00 AM in Johannesburg.Chicago observes daylight saving time while Johannesburg does not, so the gap narrows or widens by an hour part of the year.

Chicago to Johannesburg time conversion table

Chicago (CDT)	Johannesburg (SAST)	Day
12:00 AM	7:00 AM	same day
6:00 AM	1:00 PM	same day
7:00 AM	2:00 PM	same day
8:00 AM	3:00 PM	same day
9:00 AM	4:00 PM	same day
12:00 PM	7:00 PM	same day
3:00 PM	10:00 PM	same day
5:00 PM	12:00 AM	next day
6:00 PM	1:00 AM	next day
9:00 PM	4:00 AM	next day

Why people convert Chicago to Johannesburg time

Scheduling a call from Chicago to Johannesburg: a 10:00 AM start in Chicago lands at 5:00 PM in Johannesburg, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Chicago and Johannesburg are inside the 9-to-5 working day between 9:00 AM and 10:00 AM CDT time (4:00 PM–5:00 PM SAST). That is roughly 1 hours of usable overlap.
Booking travel or deliveries: tracking Johannesburg local time against Chicago keeps pickup windows and arrival estimates honest across the +7h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM CDT" is unambiguous; "3 PM" across a +7h gap is not.
Block 9:00 AM–10:00 AM CDT as the recurring meeting window if you work primarily from Chicago and need Johannesburg 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 +7h 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 SAST (South Africa Standard Time)

South Africa Standard Time (SAST) is used in South Africa, Lesotho, and Eswatini. SAST does not observe daylight saving time. Johannesburg and Cape Town are major economic hubs in Africa.

Best time to call between Chicago and Johannesburg

Both Chicago and Johannesburg sit inside the 9 AM – 5 PM working day between 9:00 AM–10:00 AM CDT, which is 4:00 PM–5:00 PM SAST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Chicago and Johannesburg overlap for only 60 minutes (9:00 AM–10:00 AM CDT), so meetings have to be booked precisely.

Chicago is 7 hours ahead of Johannesburg (CDT UTC-05:00 → SAST UTC+02:00). The shared working window is 9:00 AM–10:00 AM 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

Johannesburg

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 Johannesburg?

Chicago (CDT, UTC-05:00) is 7 hours ahead of Johannesburg (SAST, UTC+02:00). The gap is currently +7h.

How do I convert Chicago time to Johannesburg time?

Add +7h to Chicago local time. For example, 9:00 AM in Chicago is 4:00 PM in Johannesburg.

What time is it in Johannesburg right now?

Johannesburg uses SAST at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +7h offset from Chicago.

What is the best time to call Johannesburg from Chicago?

Call between 9:00 AM and 10:00 AM CDT — that maps to 4:00 PM–5:00 PM SAST and keeps both parties inside the working day.

Which is ahead, Chicago or Johannesburg?

Chicago is 7 hours ahead of Johannesburg. When it is 12:00 PM in Chicago it is 7:00 PM in Johannesburg.

Do Chicago and Johannesburg use different time zones?

Chicago (USA) uses CDT at UTC-05:00, while Johannesburg (South Africa) uses SAST at UTC+02:00. The IANA identifiers are America/Chicago and Africa/Johannesburg.

Does daylight saving time affect the Chicago–Johannesburg difference?

Yes at the moment: Chicago is on daylight saving time and Johannesburg is not, so the +7h 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 Johannesburg?

Not normally. The +7h gap only pushes the date over for late-evening times.

What is the time difference between Chicago and Johannesburg?

Johannesburg is +7h 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 Johannesburg in?

Johannesburg operates on South Africa Time (SAST), UTC+2. As Africa's largest economy hub and home to the JSE, Johannesburg drives African financial markets.

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 Johannesburg?

Standard business hours in Johannesburg are 8:00 AM - 5:00 PM SAST.

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

The best overlap for a call is when both cities are in business hours. Chicago works 8:00 AM - 5:00 PM CST and Johannesburg works 8:00 AM - 5:00 PM SAST (+7h difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Chicago and Johannesburg?

Chicago uses USD ($) while Johannesburg uses ZAR (R). Check current exchange rates when planning travel or business between these cities.

How do Chicago and Johannesburg compare in size?

Chicago has a population of approximately 2.7 million (metro: 9.5 million), while Johannesburg has approximately 5.8 million (metro: 10.5 million).

What are the major landmarks in Chicago and Johannesburg?

Chicago is known for Willis Tower, Millennium Park, Cloud Gate (The Bean). Johannesburg is famous for Apartheid Museum, Constitution Hill, Gold Reef City.

Do Chicago and Johannesburg have stock exchanges?

Yes. Chicago has the CME (Chicago Mercantile Exchange), CBOE and Johannesburg has the JSE (Johannesburg Stock Exchange). The +7h time difference affects trading hour overlaps between these exchanges.