IST to AST Converter

AST is 9h 30m behind IST. When it's 12:00 PM IST, it's 2:30 AM AST.

From

IST · UTC+5:30

9:39:51AM

India Standard Time

e.g. Kolkata

To

AST · UTC-4

12:09:51AM

Atlantic Standard Time

e.g. Halifax, Puerto Rico

Open in World ClockAST → IST
9:00 AM IST=11:30 PM(−1 day) AST
12:00 PM IST=2:30 AM AST
5:00 PM IST=7:30 AM AST

Hourly conversion (IST → AST)

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

Shaded rows are within standard working hours (8am–6pm) on both sides.

IST here is India Standard Time (UTC+5:30). It can also mean Irish Standard Time or Israel Standard Time.

More IST conversions

Frequently asked questions

What is the time difference between IST and AST?
AST is 9h 30m behind IST. IST is UTC+5:30 and AST is UTC-4.
What is 12:00 PM IST in AST?
12:00 PM IST is 2:30 AM AST.
Does IST change for daylight saving time?
IST here is India Standard Time (UTC+5:30). It can also mean Irish Standard Time or Israel Standard Time.