IST to IRST Time Converter

Convert India Standard Time (IST) to Irish Standard Time (IRST). Both time zones are shown live below; current offset between them is 4h 30m behind.

Mumbai · India Standard Time
04:56:13
Tuesday, May 12, 2026
GMT+5:30 · UTC+05:30
Dublin · Irish Standard Time
00:26:13
Tuesday, May 12, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: IST (Mumbai)
To: IRST (Dublin)
--:--

Daylight Saving status right now

IST (India Standard Time)
Observes DST
No
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

Heads up: IRST observes DST while IST does not. The 4.5-hour difference shown above will shift by one hour when IRST starts or ends DST.

When can IST and IRST meet?

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01
02
03
04
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09
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IST
IRST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Mumbai (IST). Each row shows the local working-hours state in that zone for the same moment in time.
3 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 14:00–16:00 IST (09:30–11:30 IRST).

Hour-by-hour IST to IRST conversion table

IST time (Mumbai)IRST time (Dublin)Status
00:00 Tue19:30 MonOff-hours both sides
01:00 Tue20:30 MonOff-hours both sides
02:00 Tue21:30 MonOff-hours both sides
03:00 Tue22:30 MonOff-hours both sides
04:00 Tue23:30 MonOff-hours both sides
05:00 Tue00:30 TueOff-hours both sides
06:00 Tue01:30 TueOff-hours both sides
07:00 Tue02:30 TueOff-hours both sides
08:00 Tue03:30 TueOff-hours both sides
09:00 Tue04:30 TueIST working
10:00 Tue05:30 TueIST working
11:00 Tue06:30 TueIST working
12:00 Tue07:30 TueIST working
13:00 Tue08:30 TueIST working
14:00 Tue09:30 TueBoth at work
15:00 Tue10:30 TueBoth at work
16:00 Tue11:30 TueBoth at work
17:00 Tue12:30 TueIRST working
18:00 Tue13:30 TueIRST working
19:00 Tue14:30 TueIRST working
20:00 Tue15:30 TueIRST working
21:00 Tue16:30 TueIRST working
22:00 Tue17:30 TueOff-hours both sides
23:00 Tue18:30 TueOff-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

India Standard Time (IST)
IANA identifier
Asia/Kolkata
Current UTC offset
UTC+05:30
Current abbreviation
GMT+5:30
Major cities in this zone
MumbaiNew DelhiBangaloreChennaiKolkata
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 Mumbai and Dublin

Mumbai
Sunrise
06:06
Sunset
19:05
Solar noon
12:36
Daylight
12h 59m

Related converters

IRST to IST (reverse)IST to ESTIST to PSTIST to GMTIST to UTCIST to CETEST to IRSTPST to IRSTGMT to IRSTUTC to IRSTCET to IRST
Looking for local time? See time in Mumbai or time in Dublin.

Frequently asked questions

What is the time difference between IST and IRST right now?+
IRST (Irish Standard Time) is currently 4h 30m behind IST (India Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IST or IRST observe daylight saving time?+
IST: does not observe daylight saving time. IRST: observes daylight saving time.
When is the best time to schedule a meeting between IST and IRST?+
The strongest overlap is 14:00–16:00 IST (09:30–11:30 IRST), giving 3 hours when both sides are within standard 9am-5pm working hours.
What time is it in Dublin when it is 12:00 noon in Mumbai?+
When it is 12:00 Tue in Mumbai (IST), it is 07:30 Tue in Dublin (IRST).
Which IANA time zone identifiers are used for IST and IRST?+
IST maps to "Asia/Kolkata" in the IANA database. IRST maps to "Europe/Dublin". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Mumbai ahead of or behind Dublin?+
Whether Mumbai (IST) is ahead of or behind Dublin (IRST) depends on the current UTC offsets. Right now IRST is 4h 30m behind IST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IST and IRST?+
IST is UTC+05:30 (GMT+5:30) and IRST 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 IST and IRST?+
Yes. There are 3 hours of overlap during standard 9am-5pm working hours, with the strongest window at 14:00–16:00 IST.