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).

CLT to HST

-6h

CLT

CLTSOURCE

UTC-03:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

HST

UTC-10:00

HH06

MM00

06:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

CLT

HST

12:00 AM

5:00 PM-1

2:00 AM

7:00 PM-1

4:00 AM

9:00 PM-1

6:00 AM

11:00 PM-1

8:00 AM

1:00 AM

10:00 AM

3:00 AM

12:00 PM

5:00 AM

2:00 PM

7:00 AM

4:00 PM

9:00 AM

6:00 PM

11:00 AM

8:00 PM

1:00 PM

10:00 PM

3:00 PM

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

CLT and HST on the World Map

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

CLT Zone

→

HST Zone

Explore all world timezones interactively →

CLT – Chile Standard Time

UTC-04:00

Chile Standard Time (CLT) is the time zone for continental Chile, 4 hours behind UTC.

Countries in CLT

Chile

Major Cities in CLT

SantiagoValparaísoConcepciónViña del MarAntofagasta

Key Facts about CLT

•Chile observes daylight saving time, switching to CLST (UTC-03:00) in summer.
•Santiago is the largest city in Chile with over 6 million in the metro area.
•Chile spans over 4,300 km from north to south but uses one timezone.

Daylight Saving:Yes – switches to CLST

Learn more about CLT 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

CLT vs HST: Offsets, DST and Best Call Times

CLT runs on Chile Standard Time (CLT) at UTC-04:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts CLT 6 hours behind HST — a difference of -6h at the current offsets.

In practice, when it is 9:00 AM in CLT it is 3:00 AM in HST. Midnight in CLT is 6:00 PM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

CLT to HST time conversion table

CLT (CLT)	HST (HST)	Day
12:00 AM	6:00 PM	previous day
6:00 AM	12:00 AM	same day
7:00 AM	1:00 AM	same day
8:00 AM	2:00 AM	same day
9:00 AM	3:00 AM	same day
12:00 PM	6:00 AM	same day
3:00 PM	9:00 AM	same day
5:00 PM	11:00 AM	same day
6:00 PM	12:00 PM	same day
9:00 PM	3:00 PM	same day

Why people convert CLT to HST time

Scheduling a call from CLT to HST: a 10:00 AM start in CLT lands at 4:00 AM in HST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both CLT and HST are inside the 9-to-5 working day between 3:00 PM and 5:00 PM CLT time (9:00 AM–11:00 AM HST). That is roughly 2 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in CLT is 2:00 PM in HST makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM CLT" is unambiguous; "3 PM" across a -6h gap is not.
Block 3:00 PM–5:00 PM CLT as the recurring meeting window if you work primarily from CLT and need HST colleagues present.

About CLT (Chile Standard Time)

Chile Standard Time (CLT) is the standard time in Chile. During summer months (October to March), Chile switches to Chile Summer Time (CLST, UTC-03:00). Chile is the longest north-south country in the world.

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 CLT and HST

Both CLT and HST sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM CLT, which is 9:00 AM–11:00 AM HST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

CLT and HST overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.

CLT is 6 hours behind HST (CLT UTC-04:00 → HST UTC-10:00). The shared working window is 3:00 PM–5:00 PM CLT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

CLT

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Apr 4, 2027

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 CLT and HST?

CLT (CLT, UTC-04:00) is 6 hours behind HST (HST, UTC-10:00). The gap is currently -6h.

How do I convert CLT time to HST time?

Add -6h to CLT local time. For example, 9:00 AM in CLT is 3:00 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 -6h offset from CLT.

What is the best time to call HST from CLT?

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

Which is behind, CLT or HST?

CLT is 6 hours behind HST. When it is 12:00 PM in CLT it is 6:00 AM in HST.

Does daylight saving time affect the CLT–HST difference?

Neither zone observes daylight saving time, so the -6h offset between CLT and HST is fixed all year.

Which other cities share CLT's time zone?

CLT also covers Santiago, Valparaíso, Concepción, Viña del Mar, Antofagasta.

Which countries use CLT, CLT's zone?

CLT is used in Chile.

Is there a day difference between CLT and HST?

Not normally. The -6h gap only pushes the date over the previous day.

What is the time difference between CLT and HST?

HST is -6h from CLT.

What timezone is CLT in?

CLT operates on its local timezone.

What timezone is HST in?

HST operates on its local timezone.

Which countries use CLT (Chile Standard Time)?

CLT is used in Chile.

Does CLT observe daylight saving time?

Yes, CLT switches to CLST during summer months.

What are some interesting facts about CLT?

Chile observes daylight saving time, switching to CLST (UTC-03:00) in summer. Santiago is the largest city in Chile with over 6 million in the metro area.