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
07:06:16
Wednesday, May 13, 2026
GMT+1 · UTC+01:00
London · Greenwich Mean Time
07:06:16
Wednesday, May 13, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: IRST (Dublin)
To: GMT (London)
--:--

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?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
IRST
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Dublin (IRST). Each row shows the local working-hours state in that zone for the same moment in time.
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 Wed00:00 WedOff-hours both sides
01:00 Wed01:00 WedOff-hours both sides
02:00 Wed02:00 WedOff-hours both sides
03:00 Wed03:00 WedOff-hours both sides
04:00 Wed04:00 WedOff-hours both sides
05:00 Wed05:00 WedOff-hours both sides
06:00 Wed06:00 WedOff-hours both sides
07:00 Wed07:00 WedOff-hours both sides
08:00 Wed08:00 WedOff-hours both sides
09:00 Wed09:00 WedBoth at work
10:00 Wed10:00 WedBoth at work
11:00 Wed11:00 WedBoth at work
12:00 Wed12:00 WedBoth at work
13:00 Wed13:00 WedBoth at work
14:00 Wed14:00 WedBoth at work
15:00 Wed15:00 WedBoth at work
16:00 Wed16:00 WedBoth at work
17:00 Wed17:00 WedOff-hours both sides
18:00 Wed18:00 WedOff-hours both sides
19:00 Wed19:00 WedOff-hours both sides
20:00 Wed20:00 WedOff-hours both sides
21:00 Wed21:00 WedOff-hours both sides
22:00 Wed22:00 WedOff-hours both sides
23:00 Wed23:00 WedOff-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
05:13
Sunset
20:43
Solar noon
12:58
Daylight
15h 29m

Related converters

GMT to IRST (reverse)IRST to ESTIRST to PSTIRST to UTCIRST to CETIRST to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST 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.
Is Dublin ahead of or behind London?+
Whether Dublin (IRST) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is same time IRST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IRST and GMT?+
IRST is UTC+01:00 (GMT+1) and GMT is UTC+01:00 (GMT+1). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both IRST and GMT?+
Yes. There are 8 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–16:00 IRST.