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GMT to UTC Time Converter

Use this GMT to UTC time converter to compare United Kingdom and UTC time instantly. UTC is 0 hours equal to GMT, so 9:00 AM GMT becomes 9:00 AM UTC and 5:00 PM GMT becomes 5:00 PM UTC. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.

GMT Greenwich Mean Time
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UTC Coordinated Universal Time
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Select a time to convert

GMT to UTC Quick Facts

Use this GMT to UTC converter to compare United Kingdom and Universal time, check the 0 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM GMT / 9:00 AM UTC.

Time Difference
Greenwich Mean Time and Coordinated Universal Time are in the same time zone
Useful when deadlines, handoffs, or calls cross workday boundaries.
Best Call Window
Best overlap starts around 9:00 AM GMT and 9:00 AM UTC.
Common Use Cases
Useful for remote teams, customer support windows, travel planning, webinars, and same-day deadline handoffs.

How to Convert GMT to UTC

Converting between Greenwich Mean Time and Coordinated Universal Time means no offset adjustment — here's how to do it in under 10 seconds with no sign-up.

Enter Your GMT Time

Pick the date and time in Greenwich Mean Time (UTC +0) that you want to convert. Hit "Now" to load the current GMT time instantly, or use "+1h" to step forward and compare.

Read the UTC Result

The equivalent Coordinated Universal Time (UTC +0) time appears immediately. Since UTC is 0 hours behind of GMT, most daytime conversions stay on the same calendar day.

Copy or Fine-Tune

Click "Copy Time" to grab the UTC result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.

Why Choose Our GMT to UTC Converter

Align GMT–UTC Meetings Instantly

When someone in Universal suggests 9:00 AM GMT, that's 9:00 AM UTC. This converter shows the overlap so both sides agree on one slot — no back-and-forth.

Spot Date-Line Shifts at a Glance

Late-night GMT times can land on a different date in UTC because of the 0 hours offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.

Handles DST Transitions Automatically

Daylight Saving adjustments can widen or narrow the GMT–UTC gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.

Never Miss a GMT-Timed Event

Product launches, sports matches, and webinars are often announced in GMT. Convert the event time to UTC so you know exactly when to tune in — since both zones share the same offset, no conversion is needed but this tool confirms it instantly.

GMT to UTC Time Conversion Chart

Quick-reference conversion table covering every hour of the day at a glance.

Complete 24-Hour Conversion

Greenwich Mean Time to Coordinated Universal Time full day schedule

12:00 AM
GMT
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12:00 AM
UTC
1:00 AM
GMT
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1:00 AM
UTC
2:00 AM
GMT
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2:00 AM
UTC
3:00 AM
GMT
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3:00 AM
UTC
4:00 AM
GMT
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4:00 AM
UTC
5:00 AM
GMT
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5:00 AM
UTC
6:00 AM
GMT
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6:00 AM
UTC
7:00 AM
GMT
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7:00 AM
UTC
8:00 AM
GMT
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8:00 AM
UTC
9:00 AM
GMT
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9:00 AM
UTC
10:00 AM
GMT
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10:00 AM
UTC
11:00 AM
GMT
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11:00 AM
UTC
12:00 PM
GMT
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12:00 PM
UTC
1:00 PM
GMT
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1:00 PM
UTC
2:00 PM
GMT
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2:00 PM
UTC
3:00 PM
GMT
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3:00 PM
UTC
4:00 PM
GMT
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4:00 PM
UTC
5:00 PM
GMT
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5:00 PM
UTC
6:00 PM
GMT
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6:00 PM
UTC
7:00 PM
GMT
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7:00 PM
UTC
8:00 PM
GMT
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8:00 PM
UTC
9:00 PM
GMT
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9:00 PM
UTC
10:00 PM
GMT
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10:00 PM
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11:00 PM
GMT
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11:00 PM
UTC
The two zones in context

GMT vs UTC — cities and working rhythm

GMT — Greenwich Mean Time
Primary cities: London, Dublin, Lisbon, Accra, Reykjavík

UK / Ireland / Iceland / Portugal / West Africa. Business hours 9 AM – 5:30 PM GMT typically. Note: London is on GMT in winter, BST (GMT+1) in summer — but "GMT" gets used loosely all year in scheduling contexts. Financial-services London anchors the European trading day.

UTC — Coordinated Universal Time
Primary cities: Reference clock — aviation, IT logs, science, distributed teams

UTC is the reference offset — not a civil timezone anywhere, but the standard for aviation ("Zulu time"), server logs, astronomy, and cross-timezone team calendars. When distributed engineering teams schedule "the daily standup at 15:00 UTC" they're dodging the DST-flip mess entirely.

Time gap: UTC and GMT share the same UTC offset.

Popular GMT Time Converters

Explore more GMT conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.

Convert Other Time Zones to UTC

Find the time difference from any major zone into Coordinated Universal Time. Use these pages when scheduling with Universal from a different region.

🌍 Swap direction — UTC to GMT Converter