CHAST to IST Time Converter

Convert Chatham Standard Time (CHAST) to India Standard Time (IST). Both time zones are shown live below; current offset between them is 7h 15m behind.

Chatham Islands · Chatham Standard Time
02:39:56
Thursday, May 14, 2026
GMT+12:45 · UTC+12:45
Mumbai · India Standard Time
19:24:56
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

From: CHAST (Chatham Islands)
To: IST (Mumbai)
--:--

Daylight Saving status right now

CHAST (Chatham Standard Time)
Observes DST
Yes
In DST right now
No
Next spring forward
2026-09-27
Offset shift
UTC+12:45 → UTC+13:45
IST (India Standard Time)
Observes DST
No

Heads up: CHAST observes DST while IST does not. The 7.25-hour difference shown above will shift by one hour when CHAST starts or ends DST.

When can CHAST and IST meet?

00
01
02
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09
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CHAST
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Chatham Islands (CHAST). 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 16:00–18:00 CHAST (08:45–10:45 IST).

Hour-by-hour CHAST to IST conversion table

CHAST time (Chatham Islands)IST time (Mumbai)Status
00:00 Thu16:45 WedIST working
01:00 Thu17:45 WedOff-hours both sides
02:00 Thu18:45 WedOff-hours both sides
03:00 Thu19:45 WedOff-hours both sides
04:00 Thu20:45 WedOff-hours both sides
05:00 Thu21:45 WedOff-hours both sides
06:00 Thu22:45 WedOff-hours both sides
07:00 Thu23:45 WedOff-hours both sides
08:00 Thu00:45 ThuOff-hours both sides
09:00 Thu01:45 ThuCHAST working
10:00 Thu02:45 ThuCHAST working
11:00 Thu03:45 ThuCHAST working
12:00 Thu04:45 ThuCHAST working
13:00 Thu05:45 ThuCHAST working
14:00 Thu06:45 ThuCHAST working
15:00 Thu07:45 ThuCHAST working
16:00 Thu08:45 ThuCHAST working
17:00 Thu09:45 ThuIST working
18:00 Thu10:45 ThuIST working
19:00 Thu11:45 ThuIST working
20:00 Thu12:45 ThuIST working
21:00 Thu13:45 ThuIST working
22:00 Thu14:45 ThuIST working
23:00 Thu15:45 ThuIST 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

Chatham Standard Time (CHAST)
IANA identifier
Pacific/Chatham
Current UTC offset
UTC+12:45
Current abbreviation
GMT+12:45
Major cities in this zone
Chatham Islands
India Standard Time (IST)
IANA identifier
Asia/Kolkata
Current UTC offset
UTC+05:30
Current abbreviation
GMT+5:30
Major cities in this zone
MumbaiNew DelhiBangaloreChennaiKolkata

Sun today in Chatham Islands and Mumbai

Mumbai
Sunrise
06:06
Sunset
19:06
Solar noon
12:36
Daylight
13h 0m

Related converters

IST to CHAST (reverse)CHAST to ESTCHAST to PSTCHAST to GMTCHAST to UTCCHAST to CETEST to ISTPST to ISTGMT to ISTUTC to ISTCET to IST
Looking for local time? See time in Chatham Islands or time in Mumbai.

Frequently asked questions

What is the time difference between CHAST and IST right now?+
IST (India Standard Time) is currently 7h 15m behind CHAST (Chatham Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does CHAST or IST observe daylight saving time?+
CHAST: observes daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between CHAST and IST?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 16:00–18:00 CHAST (08:45–10:45 IST).
What time is it in Mumbai when it is 12:00 noon in Chatham Islands?+
When it is 12:00 Thu in Chatham Islands (CHAST), it is 04:45 Thu in Mumbai (IST).
Which IANA time zone identifiers are used for CHAST and IST?+
CHAST maps to "Pacific/Chatham" in the IANA database. IST maps to "Asia/Kolkata". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Chatham Islands ahead of or behind Mumbai?+
Whether Chatham Islands (CHAST) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 7h 15m behind CHAST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for CHAST and IST?+
CHAST is UTC+12:45 (GMT+12:45) and IST 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 CHAST and IST?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between CHAST and IST is 16:00–18:00 CHAST.