IST to GMT Time Converter

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

Mumbai · India Standard Time
02:25:27
Monday, May 11, 2026
GMT+5:30 · UTC+05:30
London · Greenwich Mean Time
21:55:27
Sunday, May 10, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: IST (Mumbai)
To: GMT (London)
--:--

Daylight Saving status right now

IST (India Standard Time)
Observes DST
No
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

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

When can IST and GMT meet?

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01
02
03
04
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08
09
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11
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14
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IST
GMT
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 GMT).

Hour-by-hour IST to GMT conversion table

IST time (Mumbai)GMT time (London)Status
00:00 Mon19:30 SunOff-hours both sides
01:00 Mon20:30 SunOff-hours both sides
02:00 Mon21:30 SunOff-hours both sides
03:00 Mon22:30 SunOff-hours both sides
04:00 Mon23:30 SunOff-hours both sides
05:00 Mon00:30 MonOff-hours both sides
06:00 Mon01:30 MonOff-hours both sides
07:00 Mon02:30 MonOff-hours both sides
08:00 Mon03:30 MonOff-hours both sides
09:00 Mon04:30 MonIST working
10:00 Mon05:30 MonIST working
11:00 Mon06:30 MonIST working
12:00 Mon07:30 MonIST working
13:00 Mon08:30 MonIST working
14:00 Mon09:30 MonBoth at work
15:00 Mon10:30 MonBoth at work
16:00 Mon11:30 MonBoth at work
17:00 Mon12:30 MonGMT working
18:00 Mon13:30 MonGMT working
19:00 Mon14:30 MonGMT working
20:00 Mon15:30 MonGMT working
21:00 Mon16:30 MonGMT working
22:00 Mon17:30 MonOff-hours both sides
23:00 Mon18:30 MonOff-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
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 Mumbai and London

Mumbai
Sunrise
06:06
Sunset
19:05
Solar noon
12:36
Daylight
12h 58m
London
Sunrise
05:18
Sunset
20:38
Solar noon
12:58
Daylight
15h 20m

Related converters

GMT to IST (reverse)IST to ESTIST to PSTIST to UTCIST to CETIST to JSTEST to GMTPST to GMTUTC to GMTCET to GMTJST to GMT
Looking for local time? See time in Mumbai or time in London.

Frequently asked questions

What is the time difference between IST and GMT right now?+
GMT (Greenwich Mean 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 GMT observe daylight saving time?+
IST: does not observe daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between IST and GMT?+
The strongest overlap is 14:00–16:00 IST (09:30–11:30 GMT), giving 3 hours when both sides are within standard 9am-5pm working hours.
What time is it in London when it is 12:00 noon in Mumbai?+
When it is 12:00 Mon in Mumbai (IST), it is 07:30 Mon in London (GMT).
Which IANA time zone identifiers are used for IST and GMT?+
IST maps to "Asia/Kolkata" 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 Mumbai ahead of or behind London?+
Whether Mumbai (IST) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT 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 GMT?+
IST is UTC+05:30 (GMT+5:30) 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 IST and GMT?+
Yes. There are 3 hours of overlap during standard 9am-5pm working hours, with the strongest window at 14:00–16:00 IST.