KST vs GMT Time Difference
See the current 9-hour difference between Korea Standard Time and Greenwich Mean Time, check overlap hours, and plan meetings faster.
Track the 9-Hour Gap
Korea Standard Time is UTC+9 and Greenwich Mean Time is UTC+0, so KST stays 9 hours ahead of GMT. Use this page to check the live time difference and convert hours between both zones.
Understand DST Effects
Neither Korea Standard Time nor Greenwich Mean Time observes daylight saving time, so their offset remains stable year-round. Automatic timezone data based on the IANA timezone database helps keep comparisons accurate.
Find Best Meeting Times
Review hour-by-hour overlap to spot practical meeting windows for Korea and GMT-based regions. Use the comparison grid, then export plans with ICS download or add events to Google Calendar and Gmail.
KST stands for Korea Standard Time and GMT stands for Greenwich Mean Time. KST is UTC+9, GMT is UTC+0, and GMT is 9 hours behind KST, which also means KST is 9 hours ahead of GMT.
How to Find the Time Difference Between KST and GMT
Open the KST vs GMT page: Visit https://www.xconvert.com/time-converter/kst-vs-gmt to load a visual comparison grid with Korea Standard Time and Greenwich Mean Time already shown as rows. This layout is useful when you are planning a call between Seoul and London-facing teams, scheduling a shipping update with partners in South Korea, or checking whether a Korea-based workday overlaps with GMT business hours.
Add comparison cities: Click “+ Add City” and search for cities that commonly work with these time zones, such as Seoul for South Korea and London for the United Kingdom, then add any other relevant location tied to your workflow. This helps remote teams in technology, manufacturing, logistics, and media compare Korean office hours against GMT-based operations used across the UK, Ghana, Ireland in winter, and other GMT countries.
Select a time range on the grid: Click “Select” to enter selection mode, then drag across the colored timeline on the KST row to highlight a meeting window in purple; you can move it by dragging the center or fine-tune it with the left and right handles. For example, dragging across 9:00 KST to 12:00 KST shows the corresponding GMT period of 0:00 GMT to 3:00 GMT, which immediately tells you that a standard Korean morning meeting lands at midnight to early morning in GMT.
Export and share the result: After selecting a range, use the export options to send the schedule through ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially practical when a Seoul team needs to send a confirmed handoff window to colleagues working on GMT, because the exported event preserves the local time interpretation for each participant.
KST vs GMT Offset Explained
Korea Standard Time is UTC+9, while Greenwich Mean Time is UTC+0. The fixed relationship on this page is simple: GMT is 9 hours behind KST, so when it is 9:00 in KST, it is 0:00 in GMT, and when it is 18:00 in KST, it is 9:00 in GMT.
KST does not observe daylight saving time, so Korea Standard Time stays on the same offset throughout the year. GMT is a standard-time abbreviation, and its daylight saving counterpart is BST, which matters for people comparing Korean schedules with the United Kingdom because the UK does not use GMT year-round.
This seasonal distinction affects real scheduling decisions for international teams. If you are coordinating support coverage, supplier calls, or executive meetings between South Korea and GMT-based locations, the KST side remains stable all year, while GMT specifically refers to the standard-time period rather than the UK’s summer clock setting.
Where KST and GMT Are Used
KST is used in North Korea and South Korea, making it the reference time for business, travel, and communication across the Korean Peninsula. For companies working with Seoul-based electronics, automotive, gaming, semiconductor, and export partners, KST is the main scheduling standard for office hours, production updates, and client meetings.
GMT is used across a broad set of countries and territories: Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom. That broad usage makes GMT relevant for international NGOs, shipping coordination, financial operations, government communication, and media distribution that connect Korea with West Africa, the North Atlantic, and the British Isles during standard time.
Practical KST to GMT Meeting Examples
The most important planning issue is the 9-hour gap between the two time zones. A Korean morning usually falls into the GMT overnight period, which is why many live meetings between KST and GMT teams are pushed toward late afternoon in Korea or early morning in GMT.
Here are the direct conversion examples used most often for business planning: 9:00 KST = 0:00 GMT, 12:00 KST = 3:00 GMT, 15:00 KST = 6:00 GMT, and 18:00 KST = 9:00 GMT. These examples are useful for deciding whether a product review from Seoul, a news briefing for UK stakeholders, or a logistics handoff to a GMT-based operations desk can happen during normal working hours for both sides.
Frequently Asked Questions
What is the time difference between KST and GMT?
The time difference is 9 hours. GMT is 9 hours behind KST, and KST is 9 hours ahead of GMT, so a workday in Korea starts much earlier than the corresponding day in GMT.
This gap is large enough to affect daily collaboration. For example, 9:00 KST = 0:00 GMT, which means a Korean morning meeting happens at midnight in GMT.
Is KST always 9 hours ahead of GMT?
Yes. Korea Standard Time is UTC+9 and does not observe DST, so its offset does not change during the year.
GMT on this page is the standard-time reference at UTC+0. That means the KST-to-GMT relationship remains 9 hours when comparing these two abbreviations directly.
Does Korea Standard Time use daylight saving time?
No. KST does not observe DST, so South Korea and North Korea stay on the same standard offset throughout the year.
This consistency is useful for recurring schedules with Korean teams. If you run weekly calls with Seoul-based staff, the KST side remains fixed even when other countries change clocks seasonally.
Is GMT the same as UK time all year?
No. GMT is a standard-time abbreviation, and its daylight saving counterpart is BST. That means the United Kingdom uses GMT during standard time, but not for the entire year.
This distinction matters when people casually say “London time.” If you are booking meetings with UK colleagues, you need to know whether they are on GMT or BST, because that changes the practical overlap with Korea.
How do I convert KST to GMT quickly?
Use the fixed examples on the comparison grid to anchor your planning. 9:00 KST = 0:00 GMT, 12:00 KST = 3:00 GMT, 15:00 KST = 6:00 GMT, and 18:00 KST = 9:00 GMT.
These examples are especially useful for recurring business tasks such as shift handoffs, release coordination, and customer support coverage. A Korean late-afternoon update at 18:00 KST still reaches GMT teams at 9:00 GMT, which is often more practical than a Korean morning meeting.
Which countries use KST?
KST is used in North Korea and South Korea. It is the standard reference for scheduling flights, business meetings, broadcasts, and office operations across both countries.
For international companies, KST is most commonly encountered when working with South Korean partners in sectors such as electronics, shipbuilding, automotive manufacturing, gaming, and e-commerce. Using the correct KST conversion helps avoid missed calls and delayed approvals.
Which countries use GMT?
GMT is used in Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom. This makes GMT relevant across Europe, West Africa, and Atlantic territories.
Because GMT spans many countries, it often appears in multinational operations, aid coordination, shipping schedules, and cross-border administration. If your Korea-based team works with organizations in the UK or West Africa, GMT can be the common scheduling reference during standard time.
What is a good meeting window between KST and GMT?
A workable window often depends on whether one side can meet early or late, because the 9-hour difference creates limited overlap during normal office hours. The examples show why: 15:00 KST = 6:00 GMT and 18:00 KST = 9:00 GMT, so later Korean meetings are generally more realistic for GMT participants.
This pattern is common in remote team coordination. Korean teams may choose late-afternoon internal reviews so that GMT colleagues can join during their morning rather than in the middle of the night.