GMT to BST Converter

Category: Time Zone Converters

- June 19, 2025

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Greenwich Mean Time (GMT)

UTC+0 • London, Dublin, Edinburgh

Conversion Settings

Configure your timezone conversion preferences

Auto Convert

Daylight Saving Aware

Show UTC Offset

British Summer Time (BST)

UTC+1 • London, Dublin, Edinburgh

--:--:--

Select a time to convert

Time Difference: --

UTC Offset (GMT): +0:00

UTC Offset (BST): +1:00

DST Status: --

GMT Time: --

BST Time: --

Time Format:

Current GMT: --:--:--

Current BST: --:--:--

🇬🇧 GMT is always UTC+0 and is the standard UK time. BST is UTC+1 and is used from last Sunday in March to last Sunday in October.

GMT to BST Conversion Guide

What is GMT to BST Conversion?

GMT to BST conversion helps you translate time between Greenwich Mean Time and British Summer Time zones. GMT is always UTC+0 and serves as the standard time zone for the UK during winter months. BST is UTC+1 during British Summer Time from late March to late October.

Time Zone Information

Greenwich Mean Time (GMT): The standard time zone for the UK during winter months. Always UTC+0 and serves as the baseline for world time zones.

British Summer Time (BST): Used in the UK during daylight saving time from late March to late October. Always UTC+1 during this period.

Time Difference: BST is 1 hour ahead of GMT. During winter, the UK observes GMT (no time difference).

Daylight Saving Time Impact

Winter Period (GMT): Last Sunday in October to last Sunday in March - No time difference (both GMT)

Summer Period (BST): Last Sunday in March to last Sunday in October - BST is 1 hour ahead of GMT

Transition Times: Clocks change at 1:00 AM GMT/2:00 AM BST on transition dates

Common Conversion Examples

Business Hours (Winter)

GMT 9:00 AM → GMT 9:00 AM

GMT 6:00 PM → GMT 6:00 PM

No time difference during winter months

Business Hours (Summer)

GMT 9:00 AM → BST 10:00 AM

GMT 6:00 PM → BST 7:00 PM

1 hour time difference during summer months

Clock Changes

Spring Forward: Last Sunday in March at 1:00 AM

Fall Back: Last Sunday in October at 2:00 AM

Clocks spring forward to BST, fall back to GMT

Meeting Planning

Winter: Same time in both GMT and BST

Summer: Add 1 hour to GMT for BST

Always check if BST is active for your date

Conversion Tips & Best Practices

• Always check if BST is active - it runs from last Sunday in March to last Sunday in October

• GMT is the same as UTC and never changes throughout the year

• During winter months (GMT period), there is no time difference between GMT and UK local time

• BST is only 1 hour ahead of GMT, making conversions straightforward

• Use 24-hour format to avoid AM/PM confusion when scheduling

• Clock changes happen at 1:00 AM GMT (spring) and 2:00 AM BST (autumn)

Converting Time Between GMT and BST

Whether you're planning a meeting in the UK, coordinating with someone abroad, or just trying to make sense of the clock changes in spring and autumn, this GMT to BST time converter can take a load off your shoulders. It’s designed to quickly and clearly show what a given time in Greenwich Mean Time looks like in British Summer Time - and the other way around.

What This Tool Actually Does

This calculator handles the translation between GMT (Greenwich Mean Time) and BST (British Summer Time), which is the UK's daylight saving time. You choose a date and time in one of the zones, and the tool instantly shows what that same moment looks like in the other.

It doesn’t just give you the hour - it also includes the UTC offset, the current daylight saving status, and a quick breakdown of the date and time in both formats. You can use it year-round, and it adjusts for the seasonal clock changes automatically.

Why You Might Need It

If you’ve ever tried to figure out what 9 AM GMT means during the UK summer, you already know it’s not always obvious. The shift between GMT and BST can create confusion, especially if you're dealing with schedules, flights, remote teams, or broadcasting. This tool saves time by doing all the math for you.

How to Use It Step by Step

Pick a Time

Start by choosing a date and time in the input section labeled either “Greenwich Mean Time” or “British Summer Time.” You can toggle between the two by using the dropdown next to the clock inputs.

Choose the Right Time Zone

The dropdown lets you say whether you're entering the time in GMT or BST. If you're not sure which one applies to your date, the tool will help figure it out - just check the daylight saving setting below.

Hit Convert—or Let It Do That for You

If the “Auto Convert” box is checked (it is by default), the tool will automatically calculate the result as soon as you change the time or date. If you prefer doing it manually, you can uncheck that and press the “Convert Time” button instead.

Read Your Results

The output panel shows the translated time, the date, the time difference, the UTC offsets, and even a sentence telling you whether UK time is currently GMT or BST. Scroll down a bit and you’ll see both formatted time strings—great if you want to copy and paste them into messages or calendars.

Extra Tools Built In

Time Format Toggle

Prefer military-style time over AM/PM? Tap the “12 Hour” button to flip it to 24-hour mode (or back again).

Live Clocks

There’s a real-time display of the current GMT and BST time so you can see the present moment at a glance. It updates every second.

One-Click Shortcuts

Swap: Reverses the conversion direction - handy if you want to go from BST to GMT instead.
Now: Fills in the current time and date based on your chosen zone.
Reset: Puts everything back to the default view.

Keyboard Shortcuts

If you're using a keyboard, you can speed things up with a few quick keys:

Press Enter or Space to convert
S swaps timezones
N sets current time
R resets everything
F toggles between 12/24-hour formats

Things People Often Wonder About

“How do I know if BST is active?”

The converter checks this automatically based on your selected date. But in general, BST runs from the last Sunday in March until the last Sunday in October.

“Why is my time off by an hour?”

This usually comes down to whether BST is turned on for your selected date. Make sure “Daylight Saving Aware” is checked—if it's off, the tool treats all dates as if it's wintertime (GMT only).

“What’s the ‘Show Offset’ setting?”

It controls whether you see time differences with “:00” precision (like +1:00) or a shorter version (like +1). It’s just visual, not functional.

“What if I don’t want the tool to auto-convert every time I change something?”

Uncheck “Auto Convert” in the settings panel. That way, you can tweak the date and time and only convert when you hit the button.

Keep Your Schedule Lined Up - No Matter the Season

Time shifts don’t have to cause trouble. This converter is here to take the pressure off - no guessing, no calendar cross-checking, no mental math. Whether you're looking up a meeting, planning travel, or just checking what time it *really* is over there, you've got everything you need in one spot. Easy, fast, and to the point.