How do I convert GMT to IRST?

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

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

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

GMT to IRST Time Converter

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

London · Greenwich Mean Time

23:58:33

Wednesday, May 6, 2026

GMT+1 · UTC+01:00

Dublin · Irish Standard Time

23:58:33

Wednesday, May 6, 2026

GMT+1 · UTC+01:00

Convert a specific time

From: GMT (London)

To: IRST (Dublin)

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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

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

When can GMT and IRST meet?

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

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

Hour-by-hour GMT to IRST conversion table

GMT time (London)	IRST time (Dublin)	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

Greenwich Mean Time (GMT)

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

Major cities in this zone

LondonManchesterEdinburghBirmingham

Irish Standard Time (IRST)

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

Major cities in this zone

Dublin

Sun today in London and Dublin

London

Sunrise

05:24

Sunset

20:31

Solar noon

12:58

Daylight

15h 6m

Related converters

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

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

Frequently asked questions

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

IRST (Irish Standard Time) is currently same time 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 IRST observe daylight saving time?+

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

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

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

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

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

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

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