Timezone conversion
IST to AST Time — Convert India Standard Time to Atlantic Standard Time
AST is currently 8h30m behind IST. The gap shifts across the year: around January it is 9h30m behind IST, and around July it is 8h30m behind IST, because one or both zones observe daylight saving.
AST is currently 8h30m behind IST.
Abbreviation disambiguation
IST here means India Standard Time. Note: major collisions: Israel Standard Time (Asia/Jerusalem), Irish Standard Time (Europe/Dublin) — canonical=India, page must disambiguate
AST here means Atlantic Standard Time. Note: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate
Interactive converter
12:00PM
Full IST to AST conversion table
| IST | AST |
|---|---|
| 12:00 AM | 3:30 PM(previous day) |
| 1:00 AM | 4:30 PM(previous day) |
| 2:00 AM | 5:30 PM(previous day) |
| 3:00 AM | 6:30 PM(previous day) |
| 4:00 AM | 7:30 PM(previous day) |
| 5:00 AM | 8:30 PM(previous day) |
| 6:00 AM | 9:30 PM(previous day) |
| 7:00 AM | 10:30 PM(previous day) |
| 8:00 AM | 11:30 PM(previous day) |
| 9:00 AM | 12:30 AM |
| 10:00 AM | 1:30 AM |
| 11:00 AM | 2:30 AM |
| 12:00 PM | 3:30 AM |
| 1:00 PM | 4:30 AM |
| 2:00 PM | 5:30 AM |
| 3:00 PM | 6:30 AM |
| 4:00 PM | 7:30 AM |
| 5:00 PM | 8:30 AM |
| 6:00 PM | 9:30 AM |
| 7:00 PM | 10:30 AM |
| 8:00 PM | 11:30 AM |
| 9:00 PM | 12:30 PM |
| 10:00 PM | 1:30 PM |
| 11:00 PM | 2:30 PM |
Daylight saving and how the gap changes
Around January the IST → AST offset is 9h30m behind IST. Around July it is 8h30m 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.
Frequently asked questions
- Is AST ahead of or behind IST right now?
- AST is currently 8h30m behind IST.
- What is the current IST to AST time difference?
- Right now the gap is 8h30m behind — AST is 8h30m behind IST.
- Does the IST → AST offset change during the year?
- Yes. Around January the offset is 9h30m behind IST; around July it is 8h30m 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?
- Yes — Atlantic Standard Time observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
- What time is 9 AM IST in AST?
- 9:00 AM IST is 12:30 AM AST.
- What time is 12 PM (noon) IST in AST?
- 12:00 PM IST is 3:30 AM AST.
- What time is 5 PM IST in AST?
- 5:00 PM IST is 8:30 AM 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 means India Standard Time. Disambiguation: major collisions: Israel Standard Time (Asia/Jerusalem), Irish Standard Time (Europe/Dublin) — canonical=India, page must disambiguate
- Is AST on this page the same as other zones that share the letters "AST"?
- On Clockjumper, AST means Atlantic Standard Time. Disambiguation: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate