IST to ART Time Converter
ART is 8 hours and 30 minutes behind IST. IST is UTC+5:30, and ART is UTC-3:00.
Best Time to Call Between IST and ART
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 4:00 PM to 10:00 PM IST, which is 7:30 AM to 1:30 PM ART.
both at work IST only ART only neither — hours along the strip are IST.
Common Times Converted
IST on the left, ART on the right.
IST to ART: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| IST | ART | Working hours |
|---|---|---|
| 12:00 AM | 3:30 PM prev day | ART only |
| 1:00 AM | 4:30 PM prev day | ART only |
| 2:00 AM | 5:30 PM prev day | — |
| 3:00 AM | 6:30 PM prev day | — |
| 4:00 AM | 7:30 PM prev day | — |
| 5:00 AM | 8:30 PM prev day | — |
| 6:00 AM | 9:30 PM prev day | — |
| 7:00 AM | 10:30 PM prev day | — |
| 8:00 AM | 11:30 PM prev day | — |
| 9:00 AM | 12:30 AM | IST only |
| 10:00 AM | 1:30 AM | IST only |
| 11:00 AM | 2:30 AM | IST only |
| 12:00 PM | 3:30 AM | IST only |
| 1:00 PM | 4:30 AM | IST only |
| 2:00 PM | 5:30 AM | IST only |
| 3:00 PM | 6:30 AM | IST only |
| 4:00 PM | 7:30 AM | IST only |
| 5:00 PM | 8:30 AM | — |
| 6:00 PM | 9:30 AM | ART only |
| 7:00 PM | 10:30 AM | ART only |
| 8:00 PM | 11:30 AM | ART only |
| 9:00 PM | 12:30 PM | ART only |
| 10:00 PM | 1:30 PM | ART only |
| 11:00 PM | 2:30 PM | ART only |
What IST and ART Actually Are
IST — India Standard Time
Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Hyderabad — and Colombo. Standing at UTC+5:30 as written, and the region does not change its clocks, so that offset holds all year. IST also stands for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page covers the Indian one, which is by far the most searched.
India runs a single time zone across a country wide enough for two, which is why sunrise in the north-east can come nearly two hours before Mumbai's. Proposals for a second zone resurface regularly and have never been adopted.
ART — Argentina Time
Buenos Aires, Córdoba, Rosario. Standing at UTC-3:00 as written, and the region does not change its clocks, so that offset holds all year. Argentina does not observe daylight saving, so this offset is fixed year-round.
Argentina has changed its time zone rules more than a dozen times since 1930 and abandoned daylight saving in 2009.
What This Means in Practice
Expect times on the half hour
IST sits on a 30-minute offset rather than a whole hour, so a round number on one side is never a round number on the other. A 9:00 meeting becomes 30 minutes past the hour, which is exactly the detail calendar invitations get wrong when someone converts in their head.
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Major Cities in Each Zone
Cities on IST
Cities on ART
Frequently Asked Questions
What is the time difference between IST and ART?
ART is 8 hours and 30 minutes behind IST.
What is 9:00 AM IST in ART?
9:00 AM IST is 12:30 AM ART.
What are the best hours to schedule a call between IST and ART?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 4:00 PM to 10:00 PM IST, which is 7:30 AM to 1:30 PM ART.
Does the difference between IST and ART change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does IST always mean India Standard Time?
IST also stands for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page covers the Indian one, which is by far the most searched.
Does ART always mean Argentina Time?
Argentina does not observe daylight saving, so this offset is fixed year-round.