GMT to UTC Converter

UTC is 0 hours the same as GMT · UTC → GMT

GMT

Greenwich Mean Time · UTC · UTC+00:00

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UTC

Coordinated Universal Time · UTC · UTC+00:00

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Current offset note

The live clocks use today's IANA timezone rules. Right now GMT is displaying as UTC (UTC+00:00) and UTC is displaying as UTC (UTC+00:00), so this table reflects the current real-world offset.

Best time to call

Schedule between 9:00 AM – 4:00 PM GMT — that’s 9:00 AM – 4:00 PM UTC. These are the overlapping business hours (9 AM – 5 PM) in both time zones.

Meeting planner for GMT and UTC

Use these notes for recurring calls, handoffs, webinars, and launch timing across both zones.

Current difference

UTC is 0 hours the same as GMT using the current offsets shown by the live clocks.

Workday overlap

Overlap is strong: 9:00 AM – 4:00 PM GMT equals 9:00 AM – 4:00 PM UTC.

Recurring meetings

If either zone changes for daylight saving time, recheck the conversion before March-April and October-November meetings.

Quick Reference

GMT UTC
Midnight (00:00) 12:00 AM
6 AM (06:00) 6:00 AM
9 AM (09:00) 9:00 AM
Noon (12:00) 12:00 PM
3 PM (15:00) 3:00 PM
6 PM (18:00) 6:00 PM
9 PM (21:00) 9:00 PM

GMT to UTC Conversion Table

Green rows indicate overlapping business hours (9 AM – 5 PM) in both zones

GMT (24h) GMT (12h) UTC (24h) UTC (12h)
00:00 12:00 AM 00:00 12:00 AM
01:00 1:00 AM 01:00 1:00 AM
02:00 2:00 AM 02:00 2:00 AM
03:00 3:00 AM 03:00 3:00 AM
04:00 4:00 AM 04:00 4:00 AM
05:00 5:00 AM 05:00 5:00 AM
06:00 6:00 AM 06:00 6:00 AM
07:00 7:00 AM 07:00 7:00 AM
08:00 8:00 AM 08:00 8:00 AM
09:00 9:00 AM 09:00 9:00 AM
10:00 10:00 AM 10:00 10:00 AM
11:00 11:00 AM 11:00 11:00 AM
12:00 12:00 PM 12:00 12:00 PM
13:00 1:00 PM 13:00 1:00 PM
14:00 2:00 PM 14:00 2:00 PM
15:00 3:00 PM 15:00 3:00 PM
16:00 4:00 PM 16:00 4:00 PM
17:00 5:00 PM 17:00 5:00 PM
18:00 6:00 PM 18:00 6:00 PM
19:00 7:00 PM 19:00 7:00 PM
20:00 8:00 PM 20:00 8:00 PM
21:00 9:00 PM 21:00 9:00 PM
22:00 10:00 PM 22:00 10:00 PM
23:00 11:00 PM 23:00 11:00 PM

About GMT and UTC

GMT — Greenwich Mean Time

UTC offset UTC+00:00
IANA identifier Etc/GMT
Abbreviation GMT

UTC — Coordinated Universal Time

UTC offset UTC+00:00
IANA identifier Etc/UTC
Abbreviation UTC

Frequently Asked Questions

What is the time difference between GMT and UTC?

GMT (Greenwich Mean Time) is UTC+00:00, while UTC (Coordinated Universal Time) is UTC+00:00. UTC is 0 hours the same as GMT. When it’s 12:00 PM (noon) in GMT, it’s 12:00 PM in UTC.

When is 9 AM GMT in UTC?

9:00 AM GMT is 9:00 AM UTC. This conversion is useful for scheduling morning meetings or calls across these time zones.

What is the best time to schedule a call between GMT and UTC?

The overlapping business hours are 9:00 AM – 4:00 PM GMT, which corresponds to 9:00 AM – 4:00 PM UTC. Green rows in the conversion table above mark these hours.

Does daylight saving time affect the GMT to UTC conversion?

Yes, if either time zone observes DST, the offset between them may change by 1 hour during spring and autumn transitions (typically March/April and October/November). The table above shows the current offset. Use the live clocks at the top of this page for real-time accuracy, or check our interactive converter for custom dates.

How do I convert GMT to UTC manually?

GMT and UTC are at the same UTC offset, so no conversion is needed. If the result is 24 or more, subtract 24 and add one day. If negative, add 24 and subtract one day.

Convert GMT to Other Time Zones

Convert UTC to Other Time Zones