GMT to SLST Time Converter

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

London · Greenwich Mean Time
12:05:35
Wednesday, May 6, 2026
GMT+1 · UTC+01:00
Colombo · Sri Lanka Standard Time
16:35:35
Wednesday, May 6, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

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

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
SLST (Sri Lanka Standard Time)
Observes DST
No

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 GMT and SLST meet?

4 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–12:00 GMT (13:30–16:30 SLST).

Hour-by-hour GMT to SLST conversion table

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

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

Sun today in London and Colombo

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

Related converters

SLST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to SLSTPST to SLSTUTC to SLSTCET to SLSTIST to SLST
Looking for local time? See time in London or time in Colombo.

Frequently asked questions

What is the time difference between GMT and SLST right now?+
SLST (Sri Lanka 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 SLST observe daylight saving time?+
GMT: observes daylight saving time. SLST: does not observe daylight saving time.
When is the best time to schedule a meeting between GMT and SLST?+
The strongest overlap is 09:00–12:00 GMT (13:30–16:30 SLST), giving 4 hours when both sides are within standard 9am-5pm working hours.
What time is it in Colombo when it is 12:00 noon in London?+
When it is 12:00 Wed in London (GMT), it is 16:30 Wed in Colombo (SLST).
Which IANA time zone identifiers are used for GMT and SLST?+
GMT maps to "Europe/London" in the IANA database. SLST maps to "Asia/Colombo". These identifiers are what most software libraries use to convert times accurately, including DST handling.