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Chicago to HST

-5h

Chicago

CDTSOURCE
USA · UTC-05:00☀ DST active
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

HST

HST
UTC-10:00
HH07
:
MM00
  
07:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM
Chicago
HST
12:00 AM
7:00 PM-1
2:00 AM
9:00 PM-1
4:00 AM
11:00 PM-1
6:00 AM
1:00 AM
8:00 AM
3:00 AM
10:00 AM
5:00 AM
12:00 PM
7:00 AM
2:00 PM
9:00 AM
4:00 PM
11:00 AM
6:00 PM
1:00 PM
8:00 PM
3:00 PM
10:00 PM
5:00 PM

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

CDT and HST on the World Map

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

CDTHSTChicagoHoustonDallasSan AntonioHonoluluHiloKailuaPearl City
CDT Zone
→
HST 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

HST – Hawaii Standard Time

UTC-10:00

Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.

Countries in HST
United States (Hawaii)
Major Cities in HST
HonoluluHiloKailuaPearl CityKapolei
Key Facts about HST
  • •Hawaii does not observe daylight saving time.
  • •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
  • •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
Daylight Saving:No – UTC-10:00 year-round
Learn more about HST 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 →

Comparing Time Zones: Chicago and HST

Chicago runs on Central Daylight Time (CDT) at UTC-05:00, currently observing daylight saving time. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts Chicago 5 hours behind HST — a difference of -5h at the current offsets.

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

Chicago to HST time conversion table

Chicago (CDT)HST (HST)Day
12:00 AM7:00 PMprevious day
6:00 AM1:00 AMsame day
7:00 AM2:00 AMsame day
8:00 AM3:00 AMsame day
9:00 AM4:00 AMsame day
12:00 PM7:00 AMsame day
3:00 PM10:00 AMsame day
5:00 PM12:00 PMsame day
6:00 PM1:00 PMsame day
9:00 PM4:00 PMsame day

Why people convert Chicago to HST time

  • Scheduling a call from Chicago to HST: a 10:00 AM start in Chicago lands at 5:00 AM in HST, so you can confirm the slot without doing the arithmetic yourself.
  • Finding shared working hours: both Chicago and HST are inside the 9-to-5 working day between 2:00 PM and 5:00 PM CDT time (9:00 AM–12:00 PM HST). That is roughly 3 hours of usable overlap.
  • Watching a live event or market open: Chicago viewers need 4:00 AM in HST to catch a 9:00 AM start there, and 5:00 AM if the event is anchored to Chicago.
  • Always state the zone abbreviation, not just the hour. "3:00 PM CDT" is unambiguous; "3 PM" across a -5h gap is not.
  • Block 2:00 PM–5:00 PM CDT as the recurring meeting window if you work primarily from Chicago and need HST 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 -5h 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 HST (Hawaii Standard Time)

Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.

Best time to call between Chicago and HST

Both Chicago and HST sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM CDT, which is 9:00 AM–12:00 PM HST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Chicago and HST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

Chicago is 5 hours behind HST (CDT UTC-05:00 → HST UTC-10:00). The shared working window is 2:00 PM–5:00 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

HST

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 HST?

Chicago (CDT, UTC-05:00) is 5 hours behind HST (HST, UTC-10:00). The gap is currently -5h.

How do I convert Chicago time to HST time?

Add -5h to Chicago local time. For example, 9:00 AM in Chicago is 4:00 AM in HST.

What time is it in HST right now?

HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -5h offset from Chicago.

What is the best time to call HST from Chicago?

Call between 2:00 PM and 5:00 PM CDT — that maps to 9:00 AM–12:00 PM HST and keeps both parties inside the working day.

Which is behind, Chicago or HST?

Chicago is 5 hours behind HST. When it is 12:00 PM in Chicago it is 7:00 AM in HST.

Do Chicago and HST use different time zones?

Chicago (USA) uses CDT at UTC-05:00, while HST uses HST at UTC-10:00. The IANA identifiers are America/Chicago and Pacific/Honolulu.

Does daylight saving time affect the Chicago–HST difference?

Yes at the moment: Chicago is on daylight saving time and HST is not, so the -5h 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 HST?

Not normally. The -5h gap only pushes the date over the previous day.

What is the time difference between Chicago and HST?

HST is -5h 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 HST in?

HST operates on its local timezone.

What are the business hours in Chicago?

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

Which countries use CST (Central Standard Time)?

CST is used in United States (Central), Canada (Manitoba, Saskatchewan), Mexico, Guatemala, Honduras, El Salvador, and 3 more countries.

Does CST observe daylight saving time?

Yes, CST switches to CDT during summer months.

What are some interesting facts about CST?

CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.

Which cities are in the HST timezone?

Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.

What is the UTC offset for HST?

Hawaii Standard Time (HST) is at UTC-10:00.

What should I know about the HST timezone?

Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.

When is it midnight in Chicago, what time is it in HST?

When it is 12:00 AM (midnight) in Chicago (CST), it is -5h later in HST (HST).

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