Convert GMT to BST
See the current time difference between GMT and BST, compare hours side by side, and schedule meetings with calendar export tools.
How to Convert GMT to BST
Open the GMT to BST converter: Go to https://www.xconvert.com/time-converter/gmt-to-bst-converter. The page opens with GMT and BST already loaded in the visual comparison grid, which is useful if you are scheduling a London meeting during British Summer Time or checking whether a GMT-based deadline aligns with UK office hours.
Add comparison cities if your schedule involves more than the UK: Click “+ Add City” and search for cities such as London, Dublin, or Lisbon to compare how UK summer time lines up with nearby business centers that may use similar or different seasonal clock rules. This is especially helpful for finance, media, aviation, and remote support teams that work across the UK, Ireland, Portugal, and UTC-based systems.
Drag across the grid to select the GMT time range you want to convert: Click “Select” if needed, then drag on the GMT row from 9:00 AM to 11:00 AM GMT to highlight that block in purple; the BST row will show the matching time as 10:00 AM to 12:00 PM BST. That visual one-hour shift is useful for confirming that a GMT morning handoff becomes a mid-morning meeting in the UK during summer months.
Export or share the selected time range: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. For example, if you are sending a summer project review to a UK client, the ICS file and Google Calendar option ensure everyone sees the meeting in their own local time automatically instead of manually converting GMT to BST.
Understanding the GMT to BST Time Difference
BST is 1 hour ahead of GMT. When it is 9:00 AM GMT, it is 10:00 AM BST. This means any event, deadline, or call listed in GMT needs to be moved forward by one hour to get the BST time.
The difference exists because British Summer Time uses UTC+1, while Greenwich Mean Time uses UTC+0. In practical terms, GMT is the standard baseline time, and BST is the UK’s daylight saving time used to extend evening daylight during the warmer part of the year.
In the UK, BST typically runs from the last Sunday in March to the last Sunday in October. In 2025, BST begins on 30 March 2025, when clocks move forward by one hour at 1:00 AM GMT, and ends on 26 October 2025, when clocks move back by one hour at 2:00 AM BST. During that BST period, the UK is one hour ahead of GMT; outside it, UK local time returns to GMT and there is no difference.
This seasonal change matters for industries that rely on exact timing, including London financial markets, international broadcasting, airline scheduling, and distributed software teams. A meeting fixed at 3:00 PM GMT will be 4:00 PM BST during the summer, but if the UK has switched back to standard time, that same local UK meeting would again be 3:00 PM GMT.
Best Times for Calls and Meetings Between GMT and BST
Because BST is always 1 hour ahead of GMT during the summer period, the overlap is straightforward and usually easy to manage. Standard business hours such as 9:00 AM to 5:00 PM GMT convert to 10:00 AM to 6:00 PM BST, which keeps most meetings within normal office hours for both sides.
A practical morning window is 8:00 AM to 10:00 AM GMT = 9:00 AM to 11:00 AM BST. This works well for daily standups, newsroom coordination, logistics updates, and operations calls where one team uses GMT as a reference and the UK team is working on summer time.
A strong mid-day meeting block is 9:00 AM to 11:00 AM GMT = 10:00 AM to 12:00 PM BST. This is often the easiest slot for legal reviews, agency-client check-ins, and cross-border project meetings because it avoids very early starts and still leaves most of the workday available afterward.
For afternoon scheduling, 1:00 PM to 3:00 PM GMT = 2:00 PM to 4:00 PM BST is a reliable window for longer workshops, training sessions, and handoffs between teams using UTC-based systems and UK-based staff. If a deadline is set for 5:00 PM GMT, UK participants observing BST should treat that as 6:00 PM BST, which is important for contract submissions, support cutoffs, and publishing schedules.
If you are coordinating with organizations that publish schedules in GMT year-round, always verify whether the UK side is currently on BST. That check is especially important between late March and late October, when London offices, UK airports, and many British businesses are operating one hour ahead of GMT.
Frequently Asked Questions
What is the time difference between GMT and BST?
BST is 1 hour ahead of GMT. If the time is 12:00 PM GMT, the corresponding time in BST is 1:00 PM BST. This applies only while the UK is observing British Summer Time, which normally runs from the last Sunday in March to the last Sunday in October.
When is 9 AM GMT in BST?
9:00 AM GMT is 10:00 AM BST. You add one hour to convert GMT to BST during the UK daylight saving period. This is a common conversion for business calls, especially when a schedule is published in GMT but attendees are working from London or elsewhere in the UK during summer.
Does the difference between GMT and BST change during DST?
Yes. The difference is tied directly to the UK daylight saving schedule, because BST is the daylight saving version of UK time. During the BST period, the UK is 1 hour ahead of GMT; when daylight saving ends in late October, UK local time returns to GMT, so the difference becomes 0 hours.
What are the best meeting times between GMT and BST?
The easiest meeting times are usually during shared office hours, such as 9:00 AM to 11:00 AM GMT = 10:00 AM to 12:00 PM BST or 1:00 PM to 3:00 PM GMT = 2:00 PM to 4:00 PM BST. Because the gap is only one hour, most normal workday slots remain practical for both sides, which is helpful for consulting, media planning, financial operations, and internal team meetings.
Why do some schedules use GMT instead of BST?
Many international systems use GMT or UTC-style references because they remain stable and reduce ambiguity across countries. Aviation, shipping, technical infrastructure, and global event planning often publish times in GMT so participants can convert locally; during the UK summer, that means British users must remember to add one hour for BST.
Is London always in BST?
No. London uses GMT in winter and BST in summer. In 2025, London switches to BST on 30 March 2025 and returns to GMT on 26 October 2025, so whether London matches GMT or is one hour ahead depends on the date.
How can I quickly convert GMT to BST on xconvert?
Use the visual grid on the converter page and drag across the GMT row to highlight the time block you want to check. The BST row immediately shows the corresponding one-hour-ahead period, and you can then export the result through ICS, Google Calendar, Gmail, Copy to clipboard, or Share link if you need to send the converted meeting time to colleagues or clients.