How do I convert GMT to Z?

To convert GMT to Z, use our free time converter tool. Enter the time in Greenwich Mean Time and instantly see the equivalent time in Zulu Time. The converter automatically accounts for Daylight Saving Time.

What time is it in UTC when it's noon in London?

When it's 12:00 PM (noon) in London (GMT), the time in UTC (Z) depends on the current UTC offset of both zones. Use our converter to get the exact current conversion.

GMT to Z Time Converter

Convert Greenwich Mean Time (GMT) to Zulu Time (Z). Both time zones are shown live below; current offset between them is 1 hour behind.

London · Greenwich Mean Time

09:01:00

Wednesday, May 6, 2026

GMT+1 · UTC+01:00

UTC · Zulu Time

08:01:00

Wednesday, May 6, 2026

UTC · UTC+00:00

Convert a specific time

From: GMT (London)

To: Z (UTC)

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Daylight Saving status right now

GMT (Greenwich Mean Time)

Observes DST: Yes
In DST right now: Yes
Next fall back: 2026-10-25
Offset shift: UTC+01:00 → UTC+00:00

Z (Zulu Time)

Observes DST: No

Heads up: GMT observes DST while Z does not. The 1-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can GMT and Z meet?

7 hours of overlap during standard 9am-5pm working hours.

Best meeting window: 10:00–16:00 GMT (09:00–15:00 Z).

Hour-by-hour GMT to Z conversion table

GMT time (London)	Z time (UTC)	Status
00:00 Wed	23:00 Tue	Off-hours both sides
01:00 Wed	00:00 Wed	Off-hours both sides
02:00 Wed	01:00 Wed	Off-hours both sides
03:00 Wed	02:00 Wed	Off-hours both sides
04:00 Wed	03:00 Wed	Off-hours both sides
05:00 Wed	04:00 Wed	Off-hours both sides
06:00 Wed	05:00 Wed	Off-hours both sides
07:00 Wed	06:00 Wed	Off-hours both sides
08:00 Wed	07:00 Wed	Off-hours both sides
09:00 Wed	08:00 Wed	GMT working
10:00 Wed	09:00 Wed	Both at work
11:00 Wed	10:00 Wed	Both at work
12:00 Wed	11:00 Wed	Both at work
13:00 Wed	12:00 Wed	Both at work
14:00 Wed	13:00 Wed	Both at work
15:00 Wed	14:00 Wed	Both at work
16:00 Wed	15:00 Wed	Both at work
17:00 Wed	16:00 Wed	Z working
18:00 Wed	17:00 Wed	Off-hours both sides
19:00 Wed	18:00 Wed	Off-hours both sides
20:00 Wed	19:00 Wed	Off-hours both sides
21:00 Wed	20:00 Wed	Off-hours both sides
22:00 Wed	21:00 Wed	Off-hours both sides
23:00 Wed	22:00 Wed	Off-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Greenwich Mean Time (GMT)

IANA identifier: Europe/London
Current UTC offset: UTC+01:00
Current abbreviation: GMT+1

Major cities in this zone

LondonManchesterEdinburghBirmingham

Zulu Time (Z)

IANA identifier: UTC
Current UTC offset: UTC+00:00
Current abbreviation: UTC

Major cities in this zone

UTC

Sun today in London and UTC

London

Sunrise

05:24

Sunset

20:31

Solar noon

12:58

Daylight

15h 6m

Related converters

Z to GMT (reverse)GMT to EST GMT to PST GMT to UTC GMT to CET GMT to IST EST to Z PST to Z UTC to Z CET to Z IST to Z

Looking for local time? See time in London or time in UTC.

Frequently asked questions

What is the time difference between GMT and Z right now?+

Z (Zulu Time) is currently 1 hour behind GMT (Greenwich Mean Time). The exact difference can change when one or both zones transition into or out of daylight saving time.

Does GMT or Z observe daylight saving time?+

GMT: observes daylight saving time. Z: does not observe daylight saving time.

When is the best time to schedule a meeting between GMT and Z?+

The strongest overlap is 10:00–16:00 GMT (09:00–15:00 Z), giving 7 hours when both sides are within standard 9am-5pm working hours.

What time is it in UTC when it is 12:00 noon in London?+

When it is 12:00 Wed in London (GMT), it is 11:00 Wed in UTC (Z).

Which IANA time zone identifiers are used for GMT and Z?+

GMT maps to "Europe/London" in the IANA database. Z maps to "UTC". These identifiers are what most software libraries use to convert times accurately, including DST handling.