CST to SLST Time Converter

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

Chicago · Central Standard Time
14:22:55
Friday, May 15, 2026
CDT · UTC-05:00
Colombo · Sri Lanka Standard Time
00:52:55
Saturday, May 16, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

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

Daylight Saving status right now

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
SLST (Sri Lanka Standard Time)
Observes DST
No

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 CST and SLST 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
CST
SLST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Chicago (CST). Each row shows the local working-hours state in that zone for the same moment in time.
No overlap during strict 9-5 working hours; some flexibility needed.
If both sides are willing to extend to 8am-7pm, the available window is 08:00–08:00 CST (18:30–18:30 SLST).

Hour-by-hour CST to SLST conversion table

CST time (Chicago)SLST time (Colombo)Status
00:00 Fri10:30 FriSLST working
01:00 Fri11:30 FriSLST working
02:00 Fri12:30 FriSLST working
03:00 Fri13:30 FriSLST working
04:00 Fri14:30 FriSLST working
05:00 Fri15:30 FriSLST working
06:00 Fri16:30 FriSLST working
07:00 Fri17:30 FriOff-hours both sides
08:00 Fri18:30 FriOff-hours both sides
09:00 Fri19:30 FriCST working
10:00 Fri20:30 FriCST working
11:00 Fri21:30 FriCST working
12:00 Fri22:30 FriCST working
13:00 Fri23:30 FriCST working
14:00 Fri00:30 SatCST working
15:00 Fri01:30 SatCST working
16:00 Fri02:30 SatCST working
17:00 Fri03:30 SatOff-hours both sides
18:00 Fri04:30 SatOff-hours both sides
19:00 Fri05:30 SatOff-hours both sides
20:00 Fri06:30 SatOff-hours both sides
21:00 Fri07:30 SatOff-hours both sides
22:00 Fri08:30 SatOff-hours both sides
23:00 Fri09:30 SatSLST 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

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

Chicago
Sunrise
05:31
Sunset
20:04
Solar noon
12:48
Daylight
14h 32m

Related converters

SLST to CST (reverse)CST to ESTCST to PSTCST to GMTCST to UTCCST to CETEST to SLSTPST to SLSTGMT to SLSTUTC to SLSTCET to SLST
Looking for local time? See time in Chicago or time in Colombo.

Frequently asked questions

What is the time difference between CST and SLST right now?+
SLST (Sri Lanka Standard Time) is currently 10h 30m ahead CST (Central Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does CST or SLST observe daylight saving time?+
CST: observes daylight saving time. SLST: does not observe daylight saving time.
When is the best time to schedule a meeting between CST and SLST?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 08:00–08:00 CST (18:30–18:30 SLST).
What time is it in Colombo when it is 12:00 noon in Chicago?+
When it is 12:00 Fri in Chicago (CST), it is 22:30 Fri in Colombo (SLST).
Which IANA time zone identifiers are used for CST and SLST?+
CST maps to "America/Chicago" in the IANA database. SLST maps to "Asia/Colombo". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Chicago ahead of or behind Colombo?+
Whether Chicago (CST) is ahead of or behind Colombo (SLST) depends on the current UTC offsets. Right now SLST is 10h 30m ahead CST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for CST and SLST?+
CST is UTC-05:00 (CDT) and SLST 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 CST and SLST?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between CST and SLST is 08:00–08:00 CST.