GMT to KST Converter

Category: Time Zone Converters

- July 11, 2025

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Greenwich Mean Time (GMT)

UTC+0 • London, Dublin, Accra

Conversion Settings

Configure your timezone conversion preferences

Auto Convert

Daylight Saving Aware

Show UTC Offset

Show Seconds

Korea Standard Time (KST)

UTC+9 • Seoul, Busan, Pyongyang

--:--:--

Select a time to convert

Time Difference: --

UTC Offset (GMT): +0

UTC Offset (KST): +9

DST Status: --

GMT Time: --

KST Time: --

Time Format:

Current GMT: --:--:--

Current KST: --:--:--

🌍 GMT is UTC+0 and may observe BST (UTC+1) during summer. KST is UTC+9 year-round with no daylight saving.

GMT to KST Conversion Guide

What is GMT to KST Conversion?

GMT to KST conversion helps you translate time between Greenwich Mean Time and Korea Standard Time. GMT is UTC+0 (or UTC+1 during British Summer Time), while KST is UTC+9 and remains constant throughout the year. South Korea does not observe daylight saving time, making conversions straightforward. The time difference is typically 9 hours (8 hours during BST), with KST being ahead of GMT.

Time Zone Information

Greenwich Mean Time (GMT): Originally based on mean solar time at the Royal Observatory in Greenwich, London. Now essentially equivalent to UTC+0.

British Summer Time (BST): During summer months (late March to late October), the UK observes BST which is UTC+1.

Korea Standard Time (KST): Used in South Korea and North Korea year-round. Always UTC+9 with no seasonal adjustments.

Time Difference: KST is 9 hours ahead of GMT, or 8 hours ahead when the UK observes BST.

Daylight Saving Time Impact

GMT/BST Changes: The UK switches to BST (UTC+1) from late March to late October, affecting the time difference

KST Consistency: Korea Standard Time never changes and maintains UTC+9 throughout all seasons

Variable Difference: Time difference varies between 8 hours (during BST) and 9 hours (during GMT)

Common Conversion Examples

Business Hours (GMT Period)

GMT 8:00 AM → KST 5:00 PM

GMT 12:00 PM → KST 9:00 PM

Winter time conversion (9-hour difference)

Business Hours (BST Period)

BST 9:00 AM → KST 5:00 PM

BST 1:00 PM → KST 9:00 PM

Summer time conversion (8-hour difference)

International Meetings

GMT 10:00 AM → KST 7:00 PM

GMT 2:00 PM → KST 11:00 PM

Global coordination times

Server Timestamps

GMT 3:00 PM → KST 12:00 AM (next day)

GMT 11:00 PM → KST 8:00 AM (next day)

Date boundary handling

Conversion Tips & Best Practices

• Check if the UK is observing GMT (winter) or BST (summer) for accurate conversion

• Add 9 hours to GMT to get KST (8 hours during BST period)

• KST dates may advance when converting afternoon/evening GMT times

• GMT is also known as "Zulu time" in military and aviation contexts

• KST is shared with Japan Standard Time (JST) - same UTC+9 offset

• For casual use, GMT and UTC are essentially the same

GMT to KST Time Conversion

If you've ever scheduled a meeting between the UK and South Korea, you know the time gap can be a hurdle. This time converter bridges that gap with a clean interface and handy features that keep everyone on the same page. Here's a quick look at the time zones and where they apply:

GMT (UTC+0 / +1 during DST)	KST (UTC+9)
🇬🇧 United Kingdom 🇮🇪 Ireland 🇬🇭 Ghana 🇸🇱 Sierra Leone 🇬🇲 The Gambia 🇬🇳 Guinea 🇬🇼 Guinea-Bissau 🇹🇬 Togo 🇲🇱 Mali 🇸🇳 Senegal 🇲🇷 Mauritania 🇨🇻 Cabo Verde 🇨🇮 Côte d’Ivoire 🇧🇫 Burkina Faso 🇱🇷 Liberia 🇹🇭 Thailand	🇰🇷 South Korea 🇰🇵 North Korea

Why This Tool Just Works

This calculator isn’t stuffed with fluff. You get straight-up conversions between Greenwich Mean Time (GMT) and Korea Standard Time (KST), two zones that rarely see eye to eye on the clock. With just a couple of clicks, you’ll see exactly what time it is in either zone, down to the second if you want it.

GMT can jump an hour forward when the UK moves into British Summer Time, while KST stays put all year. That makes the time difference either 9 or 8 hours, depending on the season. The tool handles that for you automatically if you keep the “Daylight Saving Aware” option checked.

Here’s How You Use It

1. Set Your Date and Time

Pick the date and time you want to convert. You can do this manually or hit the “Now” button for your current time. The date and time fields sit right under the GMT/KST header.

2. Choose Your Starting Zone

Use the dropdown menu to decide whether you’re entering a time in GMT or KST. You can switch it on the fly and the labels above the input and output boxes will adjust automatically. There’s also a “Swap” button if you want to flip your input and output zones with one click.

3. Hit Convert

Click the “Convert Time” button (or just press Enter) to process your selection. You’ll see the converted time displayed prominently, along with the full date, the time difference, and whether daylight saving is in effect.

4. Adjust the Settings (Optional)

If you want more control, scroll to the “Conversion Settings” panel and play with the checkboxes:

Auto Convert: Automatically updates the result when you change the time or date
Daylight Saving Aware: Accounts for UK’s summer shift to BST
Show UTC Offset: Displays the +0, +1, or +9 offsets for reference
Show Seconds: Toggle seconds on or off

5. Reset or Try Again

Click “Reset” to return everything to the default GMT input and clear the results. No need to reload the page or lose your flow.

Need a Real-World Example?

Let’s say you’re coordinating a video call between a tech team in Ghana and an office in South Korea. If your Ghana team is ready at 9:00 AM GMT, that’s 6:00 PM in KST. Without this tool, you’d be double-checking charts or using clunky apps. Here, you plug it in and you’re done. That’s one less meeting missed because of timezone mix-ups.

Other Features You Might Miss If You Don’t Look Twice

Live Clocks: At the bottom, you’ll always see the current time in both GMT and KST. Great for ongoing monitoring.
12/24 Hour Toggle: Prefer military time? Tap the format toggle button and all time displays adjust instantly.
Keyboard Shortcuts: Power users can press Enter to convert, S to swap, R to reset, N for now, and F to toggle formats—no clicks needed.
Date Boundary Awareness: When you convert an evening GMT time to KST, it shows you the correct next-day result.

Keeping UK–Korea Time in Sync Doesn’t Have to Be a Chore

Whether you're managing remote teams, catching up with family overseas, or just syncing your favorite live stream, this GMT to KST converter gets it done fast. With automatic DST handling, flexible settings, and a clutter-free layout, it's built to keep your schedule smooth.