GMT to IST Time Converter

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

London · Greenwich Mean Time
21:55:26
Sunday, May 10, 2026
GMT+1 · UTC+01:00
Mumbai · India Standard Time
02:25:26
Monday, May 11, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

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

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
IST (India Standard Time)
Observes DST
No

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 GMT and IST 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
GMT
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in London (GMT). Each row shows the local working-hours state in that zone for the same moment in time.
4 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–12:00 GMT (13:30–16:30 IST).

Hour-by-hour GMT to IST conversion table

GMT time (London)IST time (Mumbai)Status
00:00 Sun04:30 SunOff-hours both sides
01:00 Sun05:30 SunOff-hours both sides
02:00 Sun06:30 SunOff-hours both sides
03:00 Sun07:30 SunOff-hours both sides
04:00 Sun08:30 SunOff-hours both sides
05:00 Sun09:30 SunIST working
06:00 Sun10:30 SunIST working
07:00 Sun11:30 SunIST working
08:00 Sun12:30 SunIST working
09:00 Sun13:30 SunBoth at work
10:00 Sun14:30 SunBoth at work
11:00 Sun15:30 SunBoth at work
12:00 Sun16:30 SunBoth at work
13:00 Sun17:30 SunGMT working
14:00 Sun18:30 SunGMT working
15:00 Sun19:30 SunGMT working
16:00 Sun20:30 SunGMT working
17:00 Sun21:30 SunOff-hours both sides
18:00 Sun22:30 SunOff-hours both sides
19:00 Sun23:30 SunOff-hours both sides
20:00 Sun00:30 MonOff-hours both sides
21:00 Sun01:30 MonOff-hours both sides
22:00 Sun02:30 MonOff-hours both sides
23:00 Sun03:30 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

Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham
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

Sun today in London and Mumbai

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

Related converters

IST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to JSTEST to ISTPST to ISTUTC to ISTCET to ISTJST to IST
Looking for local time? See time in London or time in Mumbai.

Frequently asked questions

What is the time difference between GMT and IST right now?+
IST (India Standard Time) is currently 4h 30m ahead 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 IST observe daylight saving time?+
GMT: observes daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between GMT and IST?+
The strongest overlap is 09:00–12:00 GMT (13:30–16:30 IST), giving 4 hours when both sides are within standard 9am-5pm working hours.
What time is it in Mumbai when it is 12:00 noon in London?+
When it is 12:00 Sun in London (GMT), it is 16:30 Sun in Mumbai (IST).
Which IANA time zone identifiers are used for GMT and IST?+
GMT maps to "Europe/London" in the IANA database. IST maps to "Asia/Kolkata". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Mumbai?+
Whether London (GMT) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 4h 30m ahead GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and IST?+
GMT is UTC+01:00 (GMT+1) and IST is UTC+05:30 (GMT+5:30). 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 GMT and IST?+
Yes. There are 4 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–12:00 GMT.