IST to ADT Time Converter

Convert India Standard Time (IST) to Atlantic Daylight Time (ADT). Both time zones are shown live below; current offset between them is 8h 30m behind.

Mumbai · India Standard Time
12:21:04
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30
Halifax · Atlantic Daylight Time
03:51:04
Wednesday, May 13, 2026
ADT · UTC-03:00

Convert a specific time

From: IST (Mumbai)
To: ADT (Halifax)
--:--

Daylight Saving status right now

IST (India Standard Time)
Observes DST
No
ADT (Atlantic Daylight Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-11-01
Offset shift
UTC-03:00 → UTC-04:00

Heads up: ADT observes DST while IST does not. The 8.5-hour difference shown above will shift by one hour when ADT starts or ends DST.

When can IST and ADT meet?

00
01
02
03
04
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06
07
08
09
10
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17
18
19
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IST
ADT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Mumbai (IST). 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 17:00–18:00 IST (08:30–09:30 ADT).

Hour-by-hour IST to ADT conversion table

IST time (Mumbai)ADT time (Halifax)Status
00:00 Wed15:30 TueADT working
01:00 Wed16:30 TueADT working
02:00 Wed17:30 TueOff-hours both sides
03:00 Wed18:30 TueOff-hours both sides
04:00 Wed19:30 TueOff-hours both sides
05:00 Wed20:30 TueOff-hours both sides
06:00 Wed21:30 TueOff-hours both sides
07:00 Wed22:30 TueOff-hours both sides
08:00 Wed23:30 TueOff-hours both sides
09:00 Wed00:30 WedIST working
10:00 Wed01:30 WedIST working
11:00 Wed02:30 WedIST working
12:00 Wed03:30 WedIST working
13:00 Wed04:30 WedIST working
14:00 Wed05:30 WedIST working
15:00 Wed06:30 WedIST working
16:00 Wed07:30 WedIST working
17:00 Wed08:30 WedOff-hours both sides
18:00 Wed09:30 WedADT working
19:00 Wed10:30 WedADT working
20:00 Wed11:30 WedADT working
21:00 Wed12:30 WedADT working
22:00 Wed13:30 WedADT working
23:00 Wed14:30 WedADT 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

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
Atlantic Daylight Time (ADT)
IANA identifier
America/Halifax
Current UTC offset
UTC-03:00
Current abbreviation
ADT
Major cities in this zone
Halifax

Sun today in Mumbai and Halifax

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

Related converters

ADT to IST (reverse)IST to ESTIST to PSTIST to GMTIST to UTCIST to CETEST to ADTPST to ADTGMT to ADTUTC to ADTCET to ADT
Looking for local time? See time in Mumbai or time in Halifax.

Frequently asked questions

What is the time difference between IST and ADT right now?+
ADT (Atlantic Daylight Time) is currently 8h 30m behind IST (India Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IST or ADT observe daylight saving time?+
IST: does not observe daylight saving time. ADT: observes daylight saving time.
When is the best time to schedule a meeting between IST and ADT?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 17:00–18:00 IST (08:30–09:30 ADT).
What time is it in Halifax when it is 12:00 noon in Mumbai?+
When it is 12:00 Wed in Mumbai (IST), it is 03:30 Wed in Halifax (ADT).
Which IANA time zone identifiers are used for IST and ADT?+
IST maps to "Asia/Kolkata" in the IANA database. ADT maps to "America/Halifax". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Mumbai ahead of or behind Halifax?+
Whether Mumbai (IST) is ahead of or behind Halifax (ADT) depends on the current UTC offsets. Right now ADT is 8h 30m behind IST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IST and ADT?+
IST is UTC+05:30 (GMT+5:30) and ADT is UTC-03:00 (ADT). 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 IST and ADT?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between IST and ADT is 17:00–18:00 IST.