IST to AST Time — Convert India Standard Time to Atlantic Standard Time

AST is currently 8 hours and 30 minutes behind IST.

On Clockjumper, IST refers to India Standard Time (UTC+5:30). The same three letters are also used for Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1) — check the city or UTC offset to be sure which is meant.

On Clockjumper, AST refers to Atlantic Standard Time in Atlantic Canada and the Caribbean (UTC−4). The same letters are also used for Arabia Standard Time (UTC+3) — check the city or UTC offset to be sure which is meant.

Around January AST is 9 hours and 30 minutes behind IST. Around July it is 8 hours and 30 minutes behind IST. That swing comes from one or both zones observing daylight saving on different schedules — the converter above always reflects the correct offset for the date you pick.

Is AST ahead of or behind IST right now?

AST is currently 8 hours and 30 minutes behind IST.

What is the current IST to AST time difference?

Right now the gap is 8 hours and 30 minutes — AST is 8 hours and 30 minutes behind IST.

Does the IST → AST offset change during the year?

Yes. Around January AST is 9 hours and 30 minutes behind IST; around July it is 8 hours and 30 minutes behind IST. The converter above always reflects the correct offset for the date you pick.

Does IST observe daylight saving time?

No — India Standard Time stays at a fixed UTC offset year-round.

Does AST observe daylight saving time?

AST is itself the standard-time form. Atlantic Standard Time is in force at UTC-4 through the winter months; outside that window the same zone is on ADT (UTC-3).

What time is 3 AM IST in AST?

3:00 AM IST is 6:30 PM (previous day) AST.

What time is 8 AM IST in AST?

8:00 AM IST is 11:30 PM (previous day) AST.

What time is 9 AM IST in AST?

9:00 AM IST is 12:30 AM AST.

What time is 10 AM IST in AST?

10:00 AM IST is 1:30 AM AST.

What time is 11 AM IST in AST?

11:00 AM IST is 2:30 AM AST.

What time is 12 PM (noon) IST in AST?

12:00 PM IST is 3:30 AM AST.

What time is 2 PM IST in AST?

2:00 PM IST is 5:30 AM AST.

What time is 3 PM IST in AST?

3:00 PM IST is 6:30 AM AST.

What time is 4 PM IST in AST?

4:00 PM IST is 7:30 AM AST.

What time is 5 PM IST in AST?

5:00 PM IST is 8:30 AM AST.

What time is 9 PM IST in AST?

9:00 PM IST is 12:30 PM AST.

What time is 10 PM IST in AST?

10:00 PM IST is 1:30 PM AST.

When is the best time to schedule a call between IST and AST?

IST and AST have no direct 09:00–17:00 overlap on the same calendar day. Consider early-morning or late-evening slots on one side, or an asynchronous handoff.

What time zone does IST refer to?

IST refers to India Standard Time (IANA: Asia/Kolkata).

What time zone does AST refer to?

AST refers to Atlantic Standard Time (IANA: America/Halifax).

Is IST on this page the same as other zones that share the letters "IST"?

On Clockjumper, IST refers to India Standard Time (UTC+5:30). The same three letters are also used for Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1) — check the city or UTC offset to be sure which is meant.

Is AST on this page the same as other zones that share the letters "AST"?

On Clockjumper, AST refers to Atlantic Standard Time in Atlantic Canada and the Caribbean (UTC−4). The same letters are also used for Arabia Standard Time (UTC+3) — check the city or UTC offset to be sure which is meant.

• AST to IST
• AEDT to IST
• AST to CST
• AEST to IST
• AST to EST
• Berlin to IST
• AST to GMT
• BST to IST
• AST to MST
• CDT to IST
• AST to PST
• CEST to IST
• CST to AST
• CET to IST
• EST to AST

• About IST (India Standard Time) →
• About AST (Atlantic Standard Time) →
• All timezone conversion pages →
• Research: how daylight saving shifts workday overlap →