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).

Hong Kong to Vietnam

-1h

Hong Kong

HKTSOURCE

Hong Kong · UTC+08:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Vietnam

ICT

UTC+07:00

HH11

MM00

11:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Hong Kong

Vietnam

12:00 AM

11:00 PM-1

2:00 AM

1:00 AM

4:00 AM

3:00 AM

6:00 AM

5:00 AM

8:00 AM

7:00 AM

10:00 AM

9:00 AM

12:00 PM

11:00 AM

2:00 PM

1:00 PM

4:00 PM

3:00 PM

6:00 PM

5:00 PM

8:00 PM

7:00 PM

10:00 PM

9:00 PM

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

HKT and ICT on the World Map

The map below highlights the HKT (Hong Kong Time) and ICT (Indochina Time) timezone regions across the globe.

HKT Zone

→

ICT Zone

Explore all world timezones interactively →

HKT – Hong Kong Time

UTC+08:00

Hong Kong Time (HKT, UTC+08:00) is the time zone for Hong Kong, 8 hours ahead of UTC.

Countries in HKT

Hong Kong SAR

Major Cities in HKT

Hong KongKowloonTsuen WanSha Tin

Key Facts about HKT

•Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979.
•HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
•The Hong Kong Stock Exchange opens at 09:30 HKT.
•Hong Kong Time does not change with the seasons, so its gap to other zones is fixed.

Daylight Saving:No – UTC+08:00 year-round

Learn more about HKT on Wikipedia

ICT – Indochina Time

UTC+07:00

Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.

Countries in ICT

ThailandVietnamCambodiaLaosIndonesia (WIB)

Major Cities in ICT

BangkokHo Chi Minh CityHanoiJakartaPhnom PenhVientiane

Key Facts about ICT

•Bangkok is one of the most visited cities in the world.
•ICT is 12 hours ahead of EST.
•Thailand, Vietnam, and Cambodia all share ICT.

Daylight Saving:No – UTC+07:00 year-round

Learn more about ICT on Wikipedia

About Hong Kong

Wikipedia

Hong Kong Time (HKT) is UTC+8 with no daylight saving. As a major financial gateway to China, Hong Kong trading hours overlap with European morning sessions.

Population:7.5 million

Metro:7.5 million

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

Currency:HKD (HK$)

Stock Exchange:HKEX (Hong Kong Stock Exchange)

Key Landmarks

Victoria PeakTian Tan BuddhaVictoria HarbourStar FerryHong Kong Disneyland

Did You Know?

The city has one of the world's most efficient and affordable public transit systems.

Learn more about HKT timezone →

Understanding the -1h Gap: Hong Kong vs Vietnam

Hong Kong runs on Hong Kong Standard Time (HKT) at UTC+08:00. Vietnam runs on Indochina Time (ICT) at UTC+07:00. That puts Hong Kong 1 hour behind Vietnam — a difference of -1h at the current offsets.

In practice, when it is 9:00 AM in Hong Kong it is 8:00 AM in Vietnam. Midnight in Hong Kong is 11:00 PM in Vietnam. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Hong Kong to Vietnam time conversion table

Hong Kong (HKT)	Vietnam (ICT)	Day
12:00 AM	11:00 PM	previous day
6:00 AM	5:00 AM	same day
7:00 AM	6:00 AM	same day
8:00 AM	7:00 AM	same day
9:00 AM	8:00 AM	same day
12:00 PM	11:00 AM	same day
3:00 PM	2:00 PM	same day
5:00 PM	4:00 PM	same day
6:00 PM	5:00 PM	same day
9:00 PM	8:00 PM	same day

Why people convert Hong Kong to Vietnam time

Scheduling a call from Hong Kong to Vietnam: a 10:00 AM start in Hong Kong lands at 9:00 AM in Vietnam, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Hong Kong and Vietnam are inside the 9-to-5 working day between 10:00 AM and 5:00 PM HKT time (9:00 AM–4:00 PM ICT). That is roughly 7 hours of usable overlap.
Watching a live event or market open: Hong Kong viewers need 8:00 AM in Vietnam to catch a 9:00 AM start there, and 1:00 AM if the event is anchored to Hong Kong.

Always state the zone abbreviation, not just the hour. "3:00 PM HKT" is unambiguous; "3 PM" across a -1h gap is not.
Block 10:00 AM–5:00 PM HKT as the recurring meeting window if you work primarily from Hong Kong and need Vietnam colleagues present.

About HKT (Hong Kong Time)

Hong Kong Time (HKT) is fixed at UTC+08:00 all year and does not observe daylight saving time. Hong Kong last used summer time in 1979 and has kept a single offset since. HKT shares the UTC+08:00 offset with China Standard Time, Singapore Time, Malaysian Time, Philippine Time and Australian Western Standard Time, but is listed separately because Hong Kong maintains its own timekeeping authority. As a major financial centre, Hong Kong's trading hours set the rhythm for markets across Asia, opening at 09:30 HKT which is 01:30 in London and 20:30 the previous evening in New York.

About ICT (Indochina Time)

Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving time.

Best time to call between Hong Kong and Vietnam

Both Hong Kong and Vietnam sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM HKT, which is 9:00 AM–4:00 PM ICT. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Hong Kong and Vietnam share 7 hours of working-hours overlap (10:00 AM–5:00 PM HKT), so scheduling a live meeting is straightforward.

Hong Kong is 1 hour behind Vietnam (HKT UTC+08:00 → ICT UTC+07:00). The shared working window is 10:00 AM–5:00 PM HKT. 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 Hong Kong and Vietnam?

Hong Kong (HKT, UTC+08:00) is 1 hour behind Vietnam (ICT, UTC+07:00). The gap is currently -1h.

How do I convert Hong Kong time to Vietnam time?

Add -1h to Hong Kong local time. For example, 9:00 AM in Hong Kong is 8:00 AM in Vietnam.

What time is it in Vietnam right now?

Vietnam uses ICT at UTC+07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from Hong Kong.

What is the best time to call Vietnam from Hong Kong?

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

Which is behind, Hong Kong or Vietnam?

Hong Kong is 1 hour behind Vietnam. When it is 12:00 PM in Hong Kong it is 11:00 AM in Vietnam.

Do Hong Kong and Vietnam use different time zones?

Hong Kong (Hong Kong) uses HKT at UTC+08:00, while Vietnam (Vietnam) uses ICT at UTC+07:00. The IANA identifiers are Asia/Hong_Kong and Asia/Ho_Chi_Minh.

Does daylight saving time affect the Hong Kong–Vietnam difference?

Neither zone observes daylight saving time, so the -1h offset between Hong Kong and Vietnam is fixed all year.

Which other cities share Hong Kong's time zone?

HKT also covers Hong Kong, Kowloon, Tsuen Wan, Sha Tin.

Which countries use HKT, Hong Kong's zone?

HKT is used in Hong Kong SAR.

Is there a day difference between Hong Kong and Vietnam?

Not normally. The -1h gap only pushes the date over the previous day.

What is the time difference between Hong Kong and Vietnam?

Vietnam is -1h from Hong Kong.

What timezone is Hong Kong in?

Hong Kong Time (HKT) is UTC+8 with no daylight saving. As a major financial gateway to China, Hong Kong trading hours overlap with European morning sessions.

What timezone is Vietnam in?

Vietnam operates on its local timezone.

What are the business hours in Hong Kong?

Standard business hours in Hong Kong are 9:00 AM - 6:00 PM HKT.

Which countries use HKT (Hong Kong Time)?

HKT is used in Hong Kong SAR.

Does HKT observe daylight saving time?

No, HKT does not observe daylight saving time and remains at UTC+08:00 year-round.

What are some interesting facts about HKT?

Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979. HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.