IOT to GMT Time Converter

Convert Indian Ocean Time (IOT) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is 5 hours behind.

Diego Garcia · Indian Ocean Time
03:57:47
Thursday, May 14, 2026
GMT+6 · UTC+06:00
London · Greenwich Mean Time
22:57:47
Wednesday, May 13, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: IOT (Diego Garcia)
To: GMT (London)
--:--

Daylight Saving status right now

IOT (Indian Ocean 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 IOT does not. The 5-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can IOT and GMT meet?

00
01
02
03
04
05
06
07
08
09
10
11
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13
14
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16
17
18
19
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21
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23
IOT
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Diego Garcia (IOT). 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 IOT (09:00–11:00 GMT).

Hour-by-hour IOT to GMT conversion table

IOT time (Diego Garcia)GMT time (London)Status
00:00 Thu19:00 WedOff-hours both sides
01:00 Thu20:00 WedOff-hours both sides
02:00 Thu21:00 WedOff-hours both sides
03:00 Thu22:00 WedOff-hours both sides
04:00 Thu23:00 WedOff-hours both sides
05:00 Thu00:00 ThuOff-hours both sides
06:00 Thu01:00 ThuOff-hours both sides
07:00 Thu02:00 ThuOff-hours both sides
08:00 Thu03:00 ThuOff-hours both sides
09:00 Thu04:00 ThuIOT working
10:00 Thu05:00 ThuIOT working
11:00 Thu06:00 ThuIOT working
12:00 Thu07:00 ThuIOT working
13:00 Thu08:00 ThuIOT working
14:00 Thu09:00 ThuBoth at work
15:00 Thu10:00 ThuBoth at work
16:00 Thu11:00 ThuBoth at work
17:00 Thu12:00 ThuGMT working
18:00 Thu13:00 ThuGMT working
19:00 Thu14:00 ThuGMT working
20:00 Thu15:00 ThuGMT working
21:00 Thu16:00 ThuGMT working
22:00 Thu17:00 ThuOff-hours both sides
23:00 Thu18:00 ThuOff-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

Indian Ocean Time (IOT)
IANA identifier
Indian/Chagos
Current UTC offset
UTC+06:00
Current abbreviation
GMT+6
Major cities in this zone
Diego Garcia
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 Diego Garcia and London

London
Sunrise
05:13
Sunset
20:43
Solar noon
12:58
Daylight
15h 29m

Related converters

GMT to IOT (reverse)IOT to ESTIOT to PSTIOT to UTCIOT to CETIOT to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Diego Garcia or time in London.

Frequently asked questions

What is the time difference between IOT and GMT right now?+
GMT (Greenwich Mean Time) is currently 5 hours behind IOT (Indian Ocean Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IOT or GMT observe daylight saving time?+
IOT: does not observe daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between IOT and GMT?+
The strongest overlap is 14:00–16:00 IOT (09:00–11:00 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 Diego Garcia?+
When it is 12:00 Thu in Diego Garcia (IOT), it is 07:00 Thu in London (GMT).
Which IANA time zone identifiers are used for IOT and GMT?+
IOT maps to "Indian/Chagos" 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 Diego Garcia ahead of or behind London?+
Whether Diego Garcia (IOT) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 5 hours behind IOT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IOT and GMT?+
IOT is UTC+06:00 (GMT+6) 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 IOT and GMT?+
Yes. There are 3 hours of overlap during standard 9am-5pm working hours, with the strongest window at 14:00–16:00 IOT.