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).

Seoul to SGT

-1h

Seoul

KSTSOURCE

South Korea · UTC+09:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

SGT

UTC+08:00

HH11

MM00

11:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Seoul

SGT

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)

KST and SGT on the World Map

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

KST Zone

→

SGT 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

SGT – Singapore Standard Time

UTC+08:00

Singapore Standard Time (SGT) is the time zone for Singapore, 8 hours ahead of UTC.

Countries in SGT

Singapore

Major Cities in SGT

Singapore

Key Facts about SGT

•Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00).
•Singapore does not observe daylight saving time.
•The Singapore Exchange (SGX) operates on SGT.

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

Learn more about SGT on Wikipedia

About Seoul

Wikipedia

Seoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.

Population:9.7 million

Metro:25.5 million

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

Currency:KRW (₩)

Stock Exchange:KRX (Korea Exchange)

Key Landmarks

Gyeongbokgung PalaceN Seoul TowerBukchon Hanok VillageDongdaemun Design PlazaCheonggyecheon Stream

Did You Know?

Seoul has the fastest average internet speed in the world.

Learn more about KST timezone →

Time Conversion Guide: Seoul to SGT

Seoul runs on Korean Standard Time (KST) at UTC+09:00. SGT runs on Singapore Standard Time (SGT) at UTC+08:00. That puts Seoul 1 hour behind SGT — a difference of -1h at the current offsets.

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

Seoul to SGT time conversion table

Seoul (KST)	SGT (SGT)	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 Seoul to SGT time

Scheduling a call from Seoul to SGT: a 10:00 AM start in Seoul lands at 9:00 AM in SGT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Seoul and SGT are inside the 9-to-5 working day between 10:00 AM and 5:00 PM KST time (9:00 AM–4:00 PM SGT). That is roughly 7 hours of usable overlap.
Coordinating a Seoul-based team with SGT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -1h gap is not.
Block 10:00 AM–5:00 PM KST as the recurring meeting window if you work primarily from Seoul and need SGT 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 SGT (Singapore Standard Time)

Singapore Standard Time (SGT) is used in Singapore year-round. Singapore does not observe daylight saving time. Despite being geographically close to the UTC+07:00 zone, Singapore uses UTC+08:00 to align with major trading partners like China, Hong Kong, and Malaysia. Singapore is a major global financial hub.

Best time to call between Seoul and SGT

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

Business hours overlap

Seoul and SGT share 7 hours of working-hours overlap (10:00 AM–5:00 PM KST), so scheduling a live meeting is straightforward.

Seoul is 1 hour behind SGT (KST UTC+09:00 → SGT UTC+08:00). The shared working window is 10:00 AM–5:00 PM KST. 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 Seoul and SGT?

Seoul (KST, UTC+09:00) is 1 hour behind SGT (SGT, UTC+08:00). The gap is currently -1h.

How do I convert Seoul time to SGT time?

Add -1h to Seoul local time. For example, 9:00 AM in Seoul is 8:00 AM in SGT.

What time is it in SGT right now?

SGT uses SGT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from Seoul.