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Greenwich Mean Time (GMT) — Live Prime Meridian Clock

Live Greenwich Mean Time (GMT UTC+0) clock. Exact time at the Prime Meridian, UTC vs GMT comparison, and 24-hour conversion chart.

04:15:09Tue, Sep 8
Time now in GMT
UTC
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London New York Tokyo Paris Sydney Dubai Mumbai Singapore 🟢 Live
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🏢 London, Manchester, Birmingham, Glasgow and 16 more
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04:15:09
Tue, Sep 8
📍 UTC
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📍 Greenwich Mean Time Timezone, Daylight & Astronomical Profile

Official geographic coordinates, UTC offset, DST rules, and financial market session hours

Country & RegionMulti-Region Timezone (ISO: GMT)Official CurrencyRegional Currencies
International Calling CodeRegional Calling CodesMetro PopulationMulti-Million Population Zone
Geographic CoordinatesGeographical Timezone BandIANA Timezone IDGMT
Standard UTC / GMT OffsetUTC+0Solar & Twilight CycleVaries by geographical latitude within timezone
Major Financial ExchangeRegional Financial ExchangesRegular Trading HoursStandard Business Hours (09:00 – 17:00 Local)
☀️ Daylight Saving Time (DST) & Transition Rules:

Standard Time only. Regions observing GMT (like the UK) advance to BST (UTC+1) in summer.

🕒 24-Hour Time Conversion Table: Greenwich Mean Time vs Global Hubs

Side-by-side hourly reference mapping Greenwich Mean Time local time to UTC, London, New York, Tokyo, and Mumbai

Greenwich Mean Time (24H)Greenwich Mean Time (12H)UTC TimeLondon (BST)New York (EDT)Tokyo (JST)Mumbai (IST)Activity Window
00:0012:00 AM00:00 UTC01:0020:0009:0005:30 Night
01:0001:00 AM01:00 UTC02:0021:0010:0006:30 Night
02:0002:00 AM02:00 UTC03:0022:0011:0007:30 Night
03:0003:00 AM03:00 UTC04:0023:0012:0008:30 Night
04:0004:00 AM04:00 UTC05:0000:0013:0009:30 Night
05:0005:00 AM05:00 UTC06:0001:0014:0010:30 Night
06:0006:00 AM06:00 UTC07:0002:0015:0011:30 Early Morning
07:0007:00 AM07:00 UTC08:0003:0016:0012:30 Early Morning
08:0008:00 AM08:00 UTC09:0004:0017:0013:30 Early Morning
09:0009:00 AM09:00 UTC10:0005:0018:0014:30 Business Hours (Working)
10:0010:00 AM10:00 UTC11:0006:0019:0015:30 Business Hours (Working)
11:0011:00 AM11:00 UTC12:0007:0020:0016:30 Business Hours (Working)
12:0012:00 PM12:00 UTC13:0008:0021:0017:30 Business Hours (Working)
13:0001:00 PM13:00 UTC14:0009:0022:0018:30 Business Hours (Working)
14:0002:00 PM14:00 UTC15:0010:0023:0019:30 Business Hours (Working)
15:0003:00 PM15:00 UTC16:0011:0000:0020:30 Business Hours (Working)
16:0004:00 PM16:00 UTC17:0012:0001:0021:30 Business Hours (Working)
17:0005:00 PM17:00 UTC18:0013:0002:0022:30 Business Hours (Working)
18:0006:00 PM18:00 UTC19:0014:0003:0023:30 Evening (Personal)
19:0007:00 PM19:00 UTC20:0015:0004:0000:30 Evening (Personal)
20:0008:00 PM20:00 UTC21:0016:0005:0001:30 Evening (Personal)
21:0009:00 PM21:00 UTC22:0017:0006:0002:30 Evening (Personal)
22:0010:00 PM22:00 UTC23:0018:0007:0003:30 Evening (Personal)
23:0011:00 PM23:00 UTC00:0019:0008:0004:30 Night

🏙️ World Clock in Different Cities

🇬🇧London Clock🇺🇸New York Clock🇯🇵Tokyo Clock🇫🇷Paris Clock🇦🇪Dubai Clock🇮🇳Mumbai Clock🇸🇬Singapore Clock🇺🇸Los Angeles Clock🇭🇰Hong Kong Clock🇩🇪Berlin Clock🇦🇺Sydney Clock🇷🇺Moscow Clock🇹🇭Bangkok Clock🇰🇷Seoul Clock🇹🇷Istanbul Clock🇨🇦Toronto Clock🇺🇸Chicago Clock🇺🇸San Francisco Clock🇮🇹Rome Clock🇪🇸Madrid Clock🇳🇱Amsterdam Clock🇨🇳Shanghai Clock🇮🇳Delhi Clock🇪🇬Cairo Clock🇲🇽Mexico City Clock

🌐 Interactive Timezone Converter Studio

Convert time offsets, schedule international meetings, and compare 24-hour schedules on a visual timeline.

⚡CET to GMT⚡EST to GMT⚡GMT to CET⚡GMT to EST⚡GMT to IST⚡GMT to PST⚡GMT to UTC⚡IST to GMT⚡PST to GMT⚡UTC to GMT

🌐 World Clock in Different Time Zones

🌐UTC Clock⏰EST Clock⏰PST Clock⏰CST Clock⏰MST Clock🌐GMT Clock🇮🇳IST Clock⏰CET Clock🇯🇵JST Clock🇦🇺AEDT Clock🇸🇬SGT Clock🇭🇰HKT Clock🇰🇷KST Clock⏰WIB Clock🇬🇧BST Clock⏰EET Clock

Overview & Capabilities

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London (longitude 0°). Historically the world’s time benchmark, GMT represents UTC+0 during winter months in Western Europe and serves as year-round standard time in West African nations.

Tutorial

How to Use

01
Check Prime Meridian Time: View current GMT hours at 0° longitude.
02
Identify GMT vs BST Shifts: In summer, the UK shifts to BST (UTC+1) while Iceland and West Africa stay on GMT.
Capabilities

Key Features

Prime Meridian Greenwich Time: Historical zero meridian reference.
Pre-Rendered 24-Hour GMT Conversion Matrix: Side-by-side mapping against New York, Tokyo, and Mumbai.
Applications

Common Use Cases

International Broadcast Coordination: Schedule global webinars using GMT reference points.
European Navigation: Align marine charts with Greenwich coordinates.
Guidance

Tips & Best Practices

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Iceland Does Not Change Clocks: Iceland remains on GMT (UTC+0) year-round without daylight saving.
Ecosystem

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Answers

Frequently Asked Questions

Q What does GMT stand for?

GMT stands for **Greenwich Mean Time**.

Q What is the UTC offset for GMT?

GMT is offset by **UTC+0**.

Q Which countries and regions use GMT?

United Kingdom (winter), Ireland (winter), Portugal (winter), Iceland (year-round), Ghana, Senegal.