IST to NZDT Time Converter
NZDT is 7 hours and 30 minutes ahead of IST. IST is UTC+5:30, and NZDT is UTC+13:00.
Best Time to Call Between IST and NZDT
Both zones are inside normal business hours between 9:00 AM and 10:00 AM IST — that's 4:30 PM to 5:30 PM NZDT. That's a 1-hour window.
both at work IST only NZDT only neither — hours along the strip are IST.
Common Times Converted
IST on the left, NZDT on the right.
IST to NZDT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| IST | NZDT | Working hours |
|---|---|---|
| 12:00 AM | 7:30 AM | — |
| 1:00 AM | 8:30 AM | — |
| 2:00 AM | 9:30 AM | NZDT only |
| 3:00 AM | 10:30 AM | NZDT only |
| 4:00 AM | 11:30 AM | NZDT only |
| 5:00 AM | 12:30 PM | NZDT only |
| 6:00 AM | 1:30 PM | NZDT only |
| 7:00 AM | 2:30 PM | NZDT only |
| 8:00 AM | 3:30 PM | NZDT only |
| 9:00 AM | 4:30 PM | Both zones |
| 10:00 AM | 5:30 PM | IST only |
| 11:00 AM | 6:30 PM | IST only |
| 12:00 PM | 7:30 PM | IST only |
| 1:00 PM | 8:30 PM | IST only |
| 2:00 PM | 9:30 PM | IST only |
| 3:00 PM | 10:30 PM | IST only |
| 4:00 PM | 11:30 PM | IST only |
| 5:00 PM | 12:30 AM next day | — |
| 6:00 PM | 1:30 AM next day | — |
| 7:00 PM | 2:30 AM next day | — |
| 8:00 PM | 3:30 AM next day | — |
| 9:00 PM | 4:30 AM next day | — |
| 10:00 PM | 5:30 AM next day | — |
| 11:00 PM | 6:30 AM next day | — |
What IST and NZDT 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.
NZDT — New Zealand Daylight Time
Auckland, Wellington, Christchurch in the southern summer. Standing at UTC+13:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, April 4, 2027, to NZST.
New Zealand daylight time runs late September to early April, and the Chatham Islands keep their own clock 45 minutes ahead of the mainland throughout.
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.
This gap is not fixed
NZDT changes its clocks and IST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, April 4, 2027 unless someone resets it.
Major Cities in Each Zone
Cities on IST
Cities on NZDT
Frequently Asked Questions
What is the time difference between IST and NZDT?
NZDT is 7 hours and 30 minutes ahead of IST.
What is 9:00 AM IST in NZDT?
9:00 AM IST is 4:30 PM NZDT.
What are the best hours to schedule a call between IST and NZDT?
Between 9:00 AM and 10:00 AM IST, which is 4:30 PM to 5:30 PM NZDT. Both sides are inside normal business hours through that window.
Does the difference between IST and NZDT change during the year?
Yes. NZDT observes daylight saving and IST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, April 4, 2027.
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.