IST to AST/ADT time converter

AST/ADT is 8 hours 30 minutes behind IST. When it is 9:00 AM in IST, it is 12:30 AM in AST/ADT.

IST UTC+5:30

Saturday, October 17, 2026

AST/ADT ADT

Friday, October 16, 2026

IST
India Standard Time
Sat, Oct 17
UTC+5:30
AST/ADT
Atlantic Daylight Time
Fri, Oct 16
ADTUTC-3-8h 30m
Finding your time zone…
Shared working hours (9:00–18:00)

IST to AST/ADT conversion table

Every hour of today in IST and the matching time in AST/ADT. Light rows are typical working hours (9:00–18:00).

ISTAST/ADT
12:00 AM3:30 PM−1 day
1:00 AM4:30 PM−1 day
2:00 AM5:30 PM−1 day
3:00 AM6:30 PM−1 day
4:00 AM7:30 PM−1 day
5:00 AM8:30 PM−1 day
6:00 AM9:30 PM−1 day
7:00 AM10:30 PM−1 day
8:00 AM11:30 PM−1 day
9:00 AM12:30 AM
10:00 AM1:30 AM
11:00 AM2:30 AM
12:00 PM3:30 AM
1:00 PM4:30 AM
2:00 PM5:30 AM
3:00 PM6:30 AM
4:00 PM7:30 AM
5:00 PM8:30 AM
6:00 PM9:30 AM
7:00 PM10:30 AM
8:00 PM11:30 AM
9:00 PM12:30 PM
10:00 PM1:30 PM
11:00 PM2:30 PM

Best time to call or meet

Working hours don't overlap fully. The closest fit is 3:30 PM – 10:00 PM in IST (7:00 AM – 1:30 PM in AST/ADT): working hours on one side, early or late on the other.

Daylight saving time and the difference

The difference changes during the year because IST and AST/ADT switch clocks on different dates:

  • Oct 17, 2026 – Nov 1, 2026: -8h 30m
  • Nov 1, 2026 – Mar 14, 2027: -9h 30m
  • Mar 14, 2027 – Oct 17, 2027: -8h 30m

More conversions

ADT to ISTIST to UTCIST to GMTIST to ESTIST to CSTIST to MSTIST to PSTIST to CETIST to MSKIST to GSTIST to PKTIST to SGTIST to PHT
UTC to ADTGMT to ADTEST to ADTCST to ADTMST to ADTPST to ADTCET to ADTMSK to ADTGST to ADTPKT to ADTSGT to ADTPHT to ADT

Questions and answers

What is the time difference between IST and AST/ADT?

AST/ADT is 8 hours 30 minutes behind IST.

What time is it in AST/ADT when it is 9 AM in IST?

When it is 9:00 AM in IST, it is 12:30 AM in AST/ADT.

When is the best time to call AST/ADT from IST?

Working hours don't overlap fully. The closest fit is 3:30 PM – 10:00 PM in IST (7:00 AM – 1:30 PM in AST/ADT): working hours on one side, early or late on the other.

Does the time difference between IST and AST/ADT change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.