UK scheduling guide
UK Time Zones
Last reviewed June 19, 2026 by TheWorldTimeMap editorial team
The UK mainland uses one local time zone, but the label changes between GMT and BST during the year. This guide explains when to use UK local time, when UTC or GMT is clearer, and how to avoid one-hour mistakes in international invitations.
When this guide helps
Use it for UK-US calls, Europe-UK meetings, webinars, travel planning, customer support, and global launch schedules. The table gives a readable overview, while the links open live clocks, converters, and city pages for exact scheduling.
Date-sensitive caution
UK local time can be GMT or BST depending on the date. A meeting described only as GMT may be wrong during the UK summer if the organizer really means London local time. For calendar invitations, include the city name, local time, and date so people and software can verify the intended offset.
Common zones and offsets
Offsets are planning references. Use the linked clock or converter with the exact date when accuracy matters.
| Zone | IANA example | Typical offset | Planning note |
|---|---|---|---|
| UK local time | Europe/London | UTC+0 / UTC+1 | Use this for London and most UK-facing calendar events. Open |
| Greenwich Mean Time | Etc/GMT | UTC+0 | A stable winter and reference label, but not always London local time in summer. Open |
| British Summer Time | Europe/London | UTC+1 | The UK daylight-saving label used during part of the year. Open |
| UTC reference | Etc/UTC | UTC+0 | Best for logs, technical deadlines, APIs, and globally neutral timestamps. Open |
| Central Europe comparison | Europe/Paris or Europe/Berlin | UTC+1 / UTC+2 | Useful when UK teams coordinate with Paris, Berlin, Madrid, or Rome. Open |
Three-step planning workflow
First, pick the real anchor city for the person or team that owns the event. A broad label such as UK Time Zones is useful for discovery, but calendar software needs a place-based zone such as the IANA examples in the table.
Second, test the exact calendar date and at least one future date if the meeting repeats. This catches daylight-saving gaps, half-hour offsets, regional exceptions, and cases where one side changes clocks before the other side does.
Third, write the invitation with both local times, the city names, and the date. For public pages, webinars, release notes, or customer emails, include a UTC reference only when it helps technical readers verify the same instant.
Common mistakes to avoid
Do not assume that today's offset will still be correct next month. Offsets shown on search pages, dashboards, or old email threads can become stale when daylight-saving rules, regional policies, or date boundaries change.
Do not use a short abbreviation without context. Labels such as CST, IST, BST, and GST can point to different regions, and some labels only apply in standard time or daylight time. Use the abbreviation as a reader-friendly hint, not as the source of truth.
Do not force every live call into the same region's convenient hours. If the overlap is narrow, rotate the inconvenient slot, shorten the live meeting, and move routine status work into written handoffs.
Popular city clocks
Open a city page when you need the local clock, local date, and related planning links instead of a broad regional label.
Check current GMT or BST for London.
GMT Time NowUse Greenwich Mean Time as a fixed UTC+0 reference.
GMT to CETConvert GMT to Central European Time.
CET to GMTConvert Central European Time to GMT.
London to New YorkCompare UK and US Eastern time on the exact date.
London to Singapore overlapPlan UK and APAC working hours.
Data and editorial notes
The live clock links use browser-supported IANA time zones through Intl.DateTimeFormat. The written offsets are planning references, not legal time advice, because governments and regions can change daylight-saving or standard-time rules.
Read Time Zone Data And Accuracy for data handling, Editorial Policy for review standards and advertising separation, or Feedback to report a correction.
Data accuracy explains IANA time zone sources, offset limitations, daylight-saving changes, and correction handling.
Editorial policy describes review standards and keeps regional guidance separate from advertising.
Feedback is the path for reporting stale offsets, broken city links, or unclear regional examples.
Privacy policy explains advertising, consent, analytics, cookies, and local browser storage.
UK Time Zones FAQ
Does the UK have more than one time zone?
The UK mainland normally uses one local civil time, Europe/London, but the label changes between GMT and BST depending on the date.
Is GMT the same as London time?
GMT matches London local time in winter. During British Summer Time, London local time is UTC+1, so GMT is not the same as London local time.
What should I put in a UK calendar invite?
Use Europe/London or London local time with the date. Add GMT or BST only as a reader-friendly label after checking the date.