SLST to CST Time Converter

Convert Sri Lanka Standard Time (SLST) to Central Standard Time (CST). Both time zones are shown live below; current offset between them is 10h 30m behind.

Colombo · Sri Lanka Standard Time
21:33:51
Thursday, May 14, 2026
GMT+5:30 · UTC+05:30
Chicago · Central Standard Time
11:03:51
Thursday, May 14, 2026
CDT · UTC-05:00

Convert a specific time

From: SLST (Colombo)
To: CST (Chicago)
--:--

Daylight Saving status right now

SLST (Sri Lanka Standard Time)
Observes DST
No
CST (Central Standard Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-11-01
Offset shift
UTC-05:00 → UTC-06:00

Heads up: CST observes DST while SLST does not. The 10.5-hour difference shown above will shift by one hour when CST starts or ends DST.

When can SLST and CST 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
SLST
CST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Colombo (SLST). Each row shows the local working-hours state in that zone for the same moment in time.
No business-hours overlap exists between SLST and CST.
The two zones are too far apart for synchronous meetings during normal working hours. Plan async or schedule outside 9-5 on at least one side.

Hour-by-hour SLST to CST conversion table

SLST time (Colombo)CST time (Chicago)Status
00:00 Thu13:30 WedCST working
01:00 Thu14:30 WedCST working
02:00 Thu15:30 WedCST working
03:00 Thu16:30 WedCST working
04:00 Thu17:30 WedOff-hours both sides
05:00 Thu18:30 WedOff-hours both sides
06:00 Thu19:30 WedOff-hours both sides
07:00 Thu20:30 WedOff-hours both sides
08:00 Thu21:30 WedOff-hours both sides
09:00 Thu22:30 WedSLST working
10:00 Thu23:30 WedSLST working
11:00 Thu00:30 ThuSLST working
12:00 Thu01:30 ThuSLST working
13:00 Thu02:30 ThuSLST working
14:00 Thu03:30 ThuSLST working
15:00 Thu04:30 ThuSLST working
16:00 Thu05:30 ThuSLST working
17:00 Thu06:30 ThuOff-hours both sides
18:00 Thu07:30 ThuOff-hours both sides
19:00 Thu08:30 ThuOff-hours both sides
20:00 Thu09:30 ThuCST working
21:00 Thu10:30 ThuCST working
22:00 Thu11:30 ThuCST working
23:00 Thu12:30 ThuCST working

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
Central Standard Time (CST)
IANA identifier
America/Chicago
Current UTC offset
UTC-05:00
Current abbreviation
CDT
Major cities in this zone
ChicagoHoustonDallasAustinNew Orleans

Sun today in Colombo and Chicago

Chicago
Sunrise
05:32
Sunset
20:03
Solar noon
12:48
Daylight
14h 30m

Related converters

CST to SLST (reverse)SLST to ESTSLST to PSTSLST to GMTSLST to UTCSLST to CETEST to CSTPST to CSTGMT to CSTUTC to CSTCET to CST
Looking for local time? See time in Colombo or time in Chicago.

Frequently asked questions

What is the time difference between SLST and CST right now?+
CST (Central Standard Time) is currently 10h 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 CST observe daylight saving time?+
SLST: does not observe daylight saving time. CST: observes daylight saving time.
When is the best time to schedule a meeting between SLST and CST?+
SLST and CST have no business-hour overlap, even at the edges of a typical workday. Async collaboration or non-9-5 scheduling is the practical choice.
What time is it in Chicago when it is 12:00 noon in Colombo?+
When it is 12:00 Thu in Colombo (SLST), it is 01:30 Thu in Chicago (CST).
Which IANA time zone identifiers are used for SLST and CST?+
SLST maps to "Asia/Colombo" in the IANA database. CST maps to "America/Chicago". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Colombo ahead of or behind Chicago?+
Whether Colombo (SLST) is ahead of or behind Chicago (CST) depends on the current UTC offsets. Right now CST is 10h 30m behind SLST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for SLST and CST?+
SLST is UTC+05:30 (GMT+5:30) and CST is UTC-05:00 (CDT). 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 SLST and CST?+
No standard business-hours overlap exists between SLST and CST. Plan asynchronous work or schedule outside 9-5 on at least one side.