KST to GMT Converter

Category: Time Zone Converters

- July 07, 2025

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Korea Standard Time (KST)

UTC+9 • Seoul, Busan, Incheon

Conversion Settings

Configure your timezone conversion preferences

Auto Convert

Daylight Saving Aware

Show UTC Offset

Show Seconds

Greenwich Mean Time (GMT)

UTC+0/+1 • London, Dublin, Lisbon

--:--:--

Select a time to convert

Time Difference: --

UTC Offset (KST): +9

UTC Offset (GMT): +0

DST Status: --

KST Time: --

GMT Time: --

Time Format:

Current KST: --:--:--

Current GMT: --:--:--

🇬🇧 KST is UTC+9 year-round. GMT switches between GMT (UTC+0) and BST (UTC+1) with daylight saving changes.

KST to GMT Conversion Guide

What is KST to GMT Conversion?

KST to GMT conversion helps you translate time between Korea Standard Time and Greenwich Mean Time. KST is UTC+9 year-round with no daylight saving time, while GMT alternates between GMT (UTC+0) and BST (UTC+1). The time difference varies: KST is 9 hours ahead during GMT and 8 hours ahead during BST.

Time Zone Information

Korea Standard Time (KST): Used in South Korea and North Korea. Always UTC+9 throughout the year with no daylight saving time changes.

Greenwich Mean Time (GMT/BST): Used in the UK and Ireland. GMT (UTC+0) during standard time, BST (UTC+1) during daylight time (March-October).

Time Difference: KST is 9 hours ahead during GMT period, 8 hours ahead during BST period.

Daylight Saving Time Impact

KST Consistency: Korean time never changes and remains UTC+9 throughout the year

GMT/BST Changes: UK time observes daylight saving from last Sunday in March to last Sunday in October

Variable Difference: Time difference changes between 8-9 hours depending on whether GMT or BST is in effect

Common Conversion Examples

Business Hours (GMT)

KST 9:00 AM → GMT 12:00 AM

KST 6:00 PM → GMT 9:00 AM

9-hour difference during standard time

Business Hours (BST)

KST 9:00 AM → BST 1:00 AM

KST 6:00 PM → BST 10:00 AM

8-hour difference during daylight time

International Calls

KST 8:00 PM → GMT 11:00 AM

KST 8:00 PM → BST 12:00 PM

Optimal calling times for business

Financial Markets

KST 6:00 AM → GMT 9:00 PM (previous day)

KST 6:00 AM → BST 10:00 PM (previous day)

Market overlap consideration

Conversion Tips & Best Practices

• KST does not change throughout the year - no daylight saving time adjustments

• Time difference changes by 1 hour twice a year when GMT switches to/from BST

• GMT is often used interchangeably with UTC, both representing the global time standard

• Best calling times from KST to GMT/BST are typically KST evening to GMT/BST morning

• Financial markets: Korean markets open when UK is in late evening/early morning

• Always verify whether UK time is currently GMT or BST when scheduling

KST to GMT Time Converter

Matching calendars across time zones doesn't need to be a puzzle. Whether you're planning a meeting, managing a remote team, or simply trying to call a friend abroad, converting between Korea Standard Time (KST) and Greenwich Mean Time (GMT) should be fast and straightforward. This tool handles the math, daylight saving shifts, and display formatting for you. Here's a quick visual of which countries follow KST and GMT to get your bearings:

Korea Standard Time (UTC+9)	Greenwich Mean Time / British Summer Time (UTC+0/+1)
🇰🇷 South Korea 🇰🇵 North Korea 🇯🇵 Japan 🇹🇱 Timor-Leste 🇷🇺 Russia (Yakutsk Region) 🇮🇩 Indonesia (Maluku & Papua) 🇵🇬 Papua New Guinea (some regions)	🇬🇧 United Kingdom 🇮🇪 Ireland 🇬🇳 Guinea 🇬🇲 Gambia 🇬🇼 Guinea-Bissau 🇸🇱 Sierra Leone 🇱🇷 Liberia 🇮🇸 Iceland 🇬🇭 Ghana 🇹🇬 Togo 🇧🇫 Burkina Faso 🇲🇷 Mauritania 🇸🇳 Senegal 🇲🇱 Mali 🇳🇪 Niger 🇧🇯 Benin 🇳🇬 Nigeria (uses WAT but close offset) 🇵🇹 Portugal (mainland) 🇸🇭 Saint Helena 🇸🇴 Somalia (uses EAT but often compared with GMT)

Korea Standard Time (UTC+9)

Greenwich Mean Time / British Summer Time (UTC+0/+1)

🇰🇷 South Korea

🇰🇵 North Korea

🇯🇵 Japan

🇹🇱 Timor-Leste

🇷🇺 Russia (Yakutsk Region)

🇮🇩 Indonesia (Maluku & Papua)

🇵🇬 Papua New Guinea (some regions)

🇬🇧 United Kingdom

🇮🇪 Ireland

🇬🇳 Guinea

🇬🇲 Gambia

🇬🇼 Guinea-Bissau

🇸🇱 Sierra Leone

🇱🇷 Liberia

🇮🇸 Iceland

🇬🇭 Ghana

🇹🇬 Togo

🇧🇫 Burkina Faso

🇲🇷 Mauritania

🇸🇳 Senegal

🇲🇱 Mali

🇳🇪 Niger

🇧🇯 Benin

🇳🇬 Nigeria (uses WAT but close offset)

🇵🇹 Portugal (mainland)

🇸🇭 Saint Helena

🇸🇴 Somalia (uses EAT but often compared with GMT)

What This Time Converter Actually Does

This calculator is designed to convert time between Korea Standard Time and Greenwich Mean Time, including UK daylight saving adjustments. It shows you not only the time conversion but also useful information like UTC offsets, time differences, and whether the UK is currently observing British Summer Time (BST).

The tool supports both directions. You can input a time from Seoul or London and flip the zones easily. It even updates in real-time to show current local time in both regions.

Why You Might Need It

If you're in Seoul and trying to plan a call with someone in London, or scheduling a delivery window, or organizing an international virtual event, this calculator keeps everything aligned. No need to memorize daylight saving rules or count hours manually. It works just as well in reverse too.

Here’s a scenario: you're a project manager in Seoul working with developers in the UK. A daily stand-up at 10:00 AM KST? That’s midnight in London during winter, but 1:00 AM in summer. This tool makes sure no one's joining half-asleep or missing the call entirely.

Step-by-Step: How to Use It

1. Pick the Input Time

Choose a date and time using the calendar and time field. You’ll see these under the “Korea Standard Time” section or "Greenwich Mean Time" depending on which timezone is selected.

2. Choose the Source Time Zone

From the dropdown, select whether you’re entering a time in KST or GMT/BST. The converter will automatically set the output to the opposite.

3. Adjust Settings if Needed

You can tweak the behavior using these options:

Auto Convert: Instantly updates the result as you type.
Daylight Saving Aware: Correctly handles BST when the UK switches clocks.
Show UTC Offset: Displays the offset like +9 or +0 in your result details.
Show Seconds: Includes seconds in the display if you need that level of accuracy.

4. Hit Convert or Use Quick Tools

Tap the “Convert Time” button to see your result. Or use:

Swap: Flips the input/output timezones.
Now: Fills the current time for the selected zone.
Reset: Clears everything and restores defaults.

Extras You Might Overlook

Toggle Between 12 and 24 Hour Format

Click the “12 Hour” button to switch between 12 and 24-hour formats. It updates everything live, including the current KST and GMT clocks.

Live Clock Display

You’ll see the current time ticking in both KST and GMT in real-time at the bottom. This makes it easy to get a live sense of what time it is on either end before you even convert anything.

Daylight Clarity

The converter automatically checks if the UK is in BST (summer time) and adjusts accordingly. You’ll see a note like “UK observing summer time (BST), KST no DST.” This helps avoid the common mistake of being an hour off during seasonal changes.

Watch Out for These Common Mix-Ups

Wrong Input Timezone: Make sure you're selecting the correct input zone. If you're entering a Korean time but have GMT selected, your result will be off.
Outdated Time: Use the “Now” button if you're not sure what time it is. Manual entries may lag a few minutes if you're not careful.
DST Off: If you turn off DST awareness, the time might not match what people in the UK are actually using during summer months.

The Right Time, Whether You're in Seoul or Stirling

This converter takes the guesswork out of time coordination between Korea and the UK. Whether you’re working across continents, planning a webinar, or just setting up a virtual coffee chat, having the right time lined up keeps everything running smoothly. It doesn’t try to do everything, just this one job, precisely and clearly.