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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse UTC for formal international timestamps and technical references. GMT is a Greenwich-derived historical time reference and the UK’s winter civil-time designation. In UK summer, clocks use British Summer Time (BST), which is one hour ahead of GMT.
UTC and GMT at a glance
| Question | UTC | GMT |
|---|---|---|
| What is it used for? | The international reference time scale, used for formal timestamps and technical reference. | A Greenwich-derived historical reference and the UK’s winter civil-time name. |
| When should you use the name? | For international coordination, technical systems and unambiguous timestamp wording. | When discussing historical timekeeping or UK local time during winter. |
| What applies in the UK in summer? | UTC remains the reference time scale. | The UK uses BST, one hour ahead of GMT; BST is not GMT. |
The terms have related roles, but they are not interchangeable in every context. Use the name that describes the time standard or local civil time you actually mean.
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What UTC means and how it is maintained
UTC (Coordinated Universal Time) is the formal international reference time scale. The Bureau International des Poids et Mesures (BIPM) computes it from clock and time-transfer data contributed by around 80 time laboratories worldwide and approximately 450 atomic clocks, according to its current UTC page accessed in 2026. Those figures describe the contributors and clocks behind the computation; they are not an accuracy score or a comparison with GMT. BIPM: Time metrology · BIPM: UTC — Coordinated Universal Time
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →UTC is derived from International Atomic Time (TAI), with leap seconds used to keep it in approximate agreement with time based on Earth’s rotation. The International Earth Rotation and Reference Systems Service (IERS) provides Earth-rotation information and is responsible for leap-second decisions or announcements. BIPM: Time metrology · IERS: Leap seconds
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Leap seconds can create discontinuities that concern critical digital infrastructure. A 2022 CGPM resolution discusses UTC’s relationship to UT1 and those infrastructure concerns; it is not evidence that a later policy change has already taken effect. CGPM/BIPM: Resolution 4 of the 27th CGPM (2022)
What GMT means today
GMT (Greenwich Mean Time) has historical roots in timekeeping at Greenwich. It became a widely used civil reference and remains the UK’s winter-time designation. It is useful when the subject is historical timekeeping or UK winter local time, but UTC is the better label for a formal international timestamp.
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The history helps explain GMT’s enduring name: Royal Museums Greenwich reports that most railway companies had adopted GMT as their standard time by the 1840s, Greenwich time became Britain’s official legal standard in 1880, and the 1884 International Meridian Conference recommended a global time-zone system based on GMT. These are historical milestones, not a definition of today’s UTC. Royal Museums Greenwich: History of Royal Observatory Greenwich
UK time: when to say GMT and when to say BST
In the UK, clocks go forward for British Summer Time, when local time is one hour ahead; when clocks go back, the UK returns to GMT. The clock-change dates vary by year, so check the official calendar for a particular date. GOV.UK: When do the clocks change?
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- For a UK summer appointment, write “14:00 BST” if that is the local time intended.
- For a UK winter appointment, write “14:00 GMT” if that is the local time intended.
- For an international meeting, “14:00 UTC” gives a clear reference; provide a date and convert to each participant’s local time when needed.
UTC stays the reference scale; the UK’s seasonal civil-time label changes. Avoid calling summer UK time GMT.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which should you use?
- Use UTC for formal international timestamps, technical documentation, logs and coordination across time zones.
- Use GMT for historical discussion or to name UK winter civil time.
- Use BST for UK summer civil time, when local clocks are one hour ahead of GMT.
There is no universally better label for every informal conversation: context determines whether GMT is being used historically or to describe UK local time. For formal cross-border communication, UTC makes the intended reference explicit.
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- 【Large LED Display】The 11" corded wall clock features full-screen time display and large bright numbers, easy to read. Here are all the features that you might expect for a digital wall clock: Time, Date, Week, Temp or Humidity. ATTENTION: Must be plugged in to work. Not battery operated.
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