How do I convert IRST to GMT?

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

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

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

IRST to GMT Time Converter

Convert Irish Standard Time (IRST) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is same time.

Dublin · Irish Standard Time

22:59:43

Wednesday, May 6, 2026

GMT+1 · UTC+01:00

London · Greenwich Mean Time

22:59:43

Wednesday, May 6, 2026

GMT+1 · UTC+01:00

Convert a specific time

From: IRST (Dublin)

To: GMT (London)

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Daylight Saving status right now

IRST (Irish Standard Time)

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

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

When can IRST and GMT meet?

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

Best meeting window: 09:00–16:00 IRST (09:00–16:00 GMT).

Hour-by-hour IRST to GMT conversion table

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

Irish Standard Time (IRST)

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

Major cities in this zone

Dublin

Greenwich Mean Time (GMT)

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

Major cities in this zone

LondonManchesterEdinburghBirmingham

Sun today in Dublin and London

London

Sunrise

05:24

Sunset

20:31

Solar noon

12:58

Daylight

15h 6m

Related converters

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

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

Frequently asked questions

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

GMT (Greenwich Mean Time) is currently same time IRST (Irish Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.

Does IRST or GMT observe daylight saving time?+

IRST: observes daylight saving time. GMT: observes daylight saving time.

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

The strongest overlap is 09:00–16:00 IRST (09:00–16:00 GMT), giving 8 hours when both sides are within standard 9am-5pm working hours.

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

When it is 12:00 Wed in Dublin (IRST), it is 12:00 Wed in London (GMT).

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

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