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).

KST to ICT

-2h

KST

KSTSOURCE

UTC+09:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

ICT

UTC+07:00

HH10

MM00

10:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

KST

ICT

12:00 AM

10:00 PM-1

2:00 AM

12:00 AM

4:00 AM

2:00 AM

6:00 AM

4:00 AM

8:00 AM

6:00 AM

10:00 AM

8:00 AM

12:00 PM

10:00 AM

2:00 PM

12:00 PM

4:00 PM

2:00 PM

6:00 PM

4:00 PM

8:00 PM

6:00 PM

10:00 PM

8:00 PM

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

KST and ICT on the World Map

The map below highlights the KST (Korea Standard Time) and ICT (Indochina Time) timezone regions across the globe.

KST Zone

→

ICT Zone

Explore all world timezones interactively →

KST – Korea Standard Time

UTC+09:00

Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.

Countries in KST

South KoreaNorth Korea

Major Cities in KST

SeoulBusanIncheonDaeguDaejeonPyongyang

Key Facts about KST

•South Korea does not observe daylight saving time.
•Seoul is home to Samsung, LG, and Hyundai headquarters.
•KST is the same offset as JST (UTC+09:00).

Daylight Saving:No – UTC+09:00 year-round

Learn more about KST 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

Understanding the -2h Gap: KST vs ICT

KST runs on Korea Standard Time (KST) at UTC+09:00. ICT runs on Indochina Time (ICT) at UTC+07:00. That puts KST 2 hours behind ICT — a difference of -2h at the current offsets.

In practice, when it is 9:00 AM in KST it is 7:00 AM in ICT. Midnight in KST is 10:00 PM in ICT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

KST to ICT time conversion table

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

Why people convert KST to ICT time

Scheduling a call from KST to ICT: a 10:00 AM start in KST lands at 8:00 AM in ICT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both KST and ICT are inside the 9-to-5 working day between 11:00 AM and 5:00 PM KST time (9:00 AM–3:00 PM ICT). That is roughly 6 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in KST is 6:00 PM in ICT makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -2h gap is not.
Block 11:00 AM–5:00 PM KST as the recurring meeting window if you work primarily from KST and need ICT colleagues present.

About KST (Korea Standard Time)

Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.

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 KST and ICT

Both KST and ICT sit inside the 9 AM – 5 PM working day between 11:00 AM–5:00 PM KST, which is 9:00 AM–3:00 PM ICT. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

KST and ICT share 6 hours of working-hours overlap (11:00 AM–5:00 PM KST), so scheduling a live meeting is straightforward.

KST is 2 hours behind ICT (KST UTC+09:00 → ICT UTC+07:00). The shared working window is 11:00 AM–5:00 PM KST. Remember to re-check around daylight-saving transitions.