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).

WAT to HST

-11h

WAT

WATSOURCE

UTC+01:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

HST

UTC-10:00

HH01

MM00

01:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

WAT

HST

12:00 AM

1:00 PM-1

2:00 AM

3:00 PM-1

4:00 AM

5:00 PM-1

6:00 AM

7:00 PM-1

8:00 AM

9:00 PM-1

10:00 AM

11:00 PM-1

12:00 PM

1:00 AM

2:00 PM

3:00 AM

4:00 PM

5:00 AM

6:00 PM

7:00 AM

8:00 PM

9:00 AM

10:00 PM

11:00 AM

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

WAT and HST on the World Map

The map below highlights the WAT (West Africa Time) and HST (Hawaii Standard Time) timezone regions across the globe.

WAT Zone

→

HST Zone

Explore all world timezones interactively →

WAT – West Africa Time

UTC+01:00

West Africa Time (WAT) is the time zone for West and Central Africa, 1 hour ahead of UTC.

Countries in WAT

NigeriaCameroonChadCongoAngolaNigerGabonEquatorial Guinea

Major Cities in WAT

LagosAbujaDoualaYaoundéLuandaKinshasaBrazzaville

Key Facts about WAT

•Lagos, Nigeria is the most populous city in Africa.
•WAT is the same offset as CET (UTC+01:00).
•Nigeria does not observe daylight saving time.

Daylight Saving:No – UTC+01:00 year-round

Learn more about WAT 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

Everything You Need to Know About WAT and HST Time

WAT runs on West Africa Time (WAT) at UTC+01:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts WAT 11 hours behind HST — a difference of -11h at the current offsets.

In practice, when it is 9:00 AM in WAT it is 10:00 PM in HST on the previous day. Midnight in WAT is 1:00 PM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

WAT to HST time conversion table

WAT (WAT)	HST (HST)	Day
12:00 AM	1:00 PM	previous day
6:00 AM	7:00 PM	previous day
7:00 AM	8:00 PM	previous day
8:00 AM	9:00 PM	previous day
9:00 AM	10:00 PM	previous day
12:00 PM	1:00 AM	same day
3:00 PM	4:00 AM	same day
5:00 PM	6:00 AM	same day
6:00 PM	7:00 AM	same day
9:00 PM	10:00 AM	same day

Why people convert WAT to HST time

Scheduling a call from WAT to HST: a 10:00 AM start in WAT lands at 11:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -11h gap: WAT and HST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in HST is 10:00 PM in WAT.
Keeping family and friends in sync: knowing that 8:00 PM in WAT is 9:00 AM in HST makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM WAT" is unambiguous; "3 PM" across a -11h gap is not.
With a -11h gap there is no shared 9-to-5 window, so alternate the early start: one week WAT takes the early slot, the next week HST does.

About WAT (West Africa Time)

West Africa Time (WAT) is used across much of West and Central Africa, including Nigeria, the most populous country in Africa. WAT does not observe daylight saving time and shares the same offset as Central European Time (CET).

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 WAT and HST

With a -11h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 10:00 PM in WAT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

WAT and HST have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.

WAT is 11 hours behind HST (WAT UTC+01:00 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

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 WAT and HST?

WAT (WAT, UTC+01:00) is 11 hours behind HST (HST, UTC-10:00). The gap is currently -11h.

How do I convert WAT time to HST time?

Add -11h to WAT local time. For example, 9:00 AM in WAT is 10:00 PM in HST (previous day).

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 -11h offset from WAT.