SLST to GMT Time Converter

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

Colombo · Sri Lanka Standard Time
12:11:44
Wednesday, May 6, 2026
GMT+5:30 · UTC+05:30
London · Greenwich Mean Time
07:41:44
Wednesday, May 6, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: SLST (Colombo)
To: GMT (London)
--:--

Daylight Saving status right now

SLST (Sri Lanka 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 SLST does not. The 4.5-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can SLST and GMT meet?

3 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 14:00–16:00 SLST (09:30–11:30 GMT).

Hour-by-hour SLST to GMT conversion table

SLST time (Colombo)GMT time (London)Status
00:00 Wed19:30 TueOff-hours both sides
01:00 Wed20:30 TueOff-hours both sides
02:00 Wed21:30 TueOff-hours both sides
03:00 Wed22:30 TueOff-hours both sides
04:00 Wed23:30 TueOff-hours both sides
05:00 Wed00:30 WedOff-hours both sides
06:00 Wed01:30 WedOff-hours both sides
07:00 Wed02:30 WedOff-hours both sides
08:00 Wed03:30 WedOff-hours both sides
09:00 Wed04:30 WedSLST working
10:00 Wed05:30 WedSLST working
11:00 Wed06:30 WedSLST working
12:00 Wed07:30 WedSLST working
13:00 Wed08:30 WedSLST working
14:00 Wed09:30 WedBoth at work
15:00 Wed10:30 WedBoth at work
16:00 Wed11:30 WedBoth at work
17:00 Wed12:30 WedGMT working
18:00 Wed13:30 WedGMT working
19:00 Wed14:30 WedGMT working
20:00 Wed15:30 WedGMT working
21:00 Wed16:30 WedGMT working
22:00 Wed17:30 WedOff-hours both sides
23:00 Wed18:30 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

Sri Lanka Standard Time (SLST)
IANA identifier
Asia/Colombo
Current UTC offset
UTC+05:30
Current abbreviation
GMT+5:30
Major cities in this zone
Colombo
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 Colombo and London

London
Sunrise
05:24
Sunset
20:31
Solar noon
12:58
Daylight
15h 6m

Related converters

GMT to SLST (reverse)SLST to ESTSLST to PSTSLST to UTCSLST to CETSLST to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Colombo or time in London.

Frequently asked questions

What is the time difference between SLST and GMT right now?+
GMT (Greenwich Mean Time) is currently 4h 30m behind SLST (Sri Lanka Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does SLST or GMT observe daylight saving time?+
SLST: does not observe daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between SLST and GMT?+
The strongest overlap is 14:00–16:00 SLST (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 Colombo?+
When it is 12:00 Wed in Colombo (SLST), it is 07:30 Wed in London (GMT).
Which IANA time zone identifiers are used for SLST and GMT?+
SLST maps to "Asia/Colombo" in the IANA database. GMT maps to "Europe/London". These identifiers are what most software libraries use to convert times accurately, including DST handling.