ACST to IST Time Converter

Convert Australian Central Standard Time (ACST) to India Standard Time (IST). Both time zones are shown live below; current offset between them is 4 hours behind.

Adelaide · Australian Central Standard Time
02:23:00
Wednesday, May 13, 2026
GMT+9:30 · UTC+09:30
Mumbai · India Standard Time
22:23:00
Tuesday, May 12, 2026
GMT+5:30 · UTC+05:30

Convert a specific time

From: ACST (Adelaide)
To: IST (Mumbai)
--:--

Daylight Saving status right now

ACST (Australian Central Standard Time)
Observes DST
Yes
In DST right now
No
Next spring forward
2026-10-04
Offset shift
UTC+09:30 → UTC+10:30
IST (India Standard Time)
Observes DST
No

Heads up: ACST observes DST while IST does not. The 4-hour difference shown above will shift by one hour when ACST starts or ends DST.

When can ACST and IST meet?

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01
02
03
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09
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ACST
IST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Adelaide (ACST). Each row shows the local working-hours state in that zone for the same moment in time.
4 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 13:00–16:00 ACST (09:00–12:00 IST).

Hour-by-hour ACST to IST conversion table

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

Australian Central Standard Time (ACST)
IANA identifier
Australia/Adelaide
Current UTC offset
UTC+09:30
Current abbreviation
GMT+9:30
Major cities in this zone
Adelaide
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 Adelaide and Mumbai

Adelaide
Sunrise
07:02
Sunset
17:24
Solar noon
12:13
Daylight
10h 22m
Mumbai
Sunrise
06:06
Sunset
19:05
Solar noon
12:36
Daylight
12h 59m

Related converters

IST to ACST (reverse)ACST to ESTACST to PSTACST to GMTACST to UTCACST to CETEST to ISTPST to ISTGMT to ISTUTC to ISTCET to IST
Looking for local time? See time in Adelaide or time in Mumbai.

Frequently asked questions

What is the time difference between ACST and IST right now?+
IST (India Standard Time) is currently 4 hours behind ACST (Australian Central Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does ACST or IST observe daylight saving time?+
ACST: observes daylight saving time. IST: does not observe daylight saving time.
When is the best time to schedule a meeting between ACST and IST?+
The strongest overlap is 13:00–16:00 ACST (09:00–12:00 IST), giving 4 hours when both sides are within standard 9am-5pm working hours.
What time is it in Mumbai when it is 12:00 noon in Adelaide?+
When it is 12:00 Wed in Adelaide (ACST), it is 08:00 Wed in Mumbai (IST).
Which IANA time zone identifiers are used for ACST and IST?+
ACST maps to "Australia/Adelaide" 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 Adelaide ahead of or behind Mumbai?+
Whether Adelaide (ACST) is ahead of or behind Mumbai (IST) depends on the current UTC offsets. Right now IST is 4 hours behind ACST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for ACST and IST?+
ACST is UTC+09:30 (GMT+9:30) 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 ACST and IST?+
Yes. There are 4 hours of overlap during standard 9am-5pm working hours, with the strongest window at 13:00–16:00 ACST.