Highlighted rows fall within 09:00–18:00 in both places: 2 shared working hours.
How many hours is IST behind NZDT?
As abbreviations, NZDT is always 7.5 hours ahead of IST: IST is UTC+5:30 and NZDT is UTC+13. To convert, add 7.5 hours.
When the IST to NZDT time difference changes
For most of the year NZDT is 7.5 hours ahead of IST. From 4 April to 25 September 2027, NZDT is 6.5 hours ahead of IST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
NZDT vs IST
Length
27 September 2026 to 31 December 2026
7.5 hours ahead
96 days
1 January 2027 to 3 April 2027
7.5 hours ahead
93 days
4 April 2027 to 25 September 2027
6.5 hours ahead
175 days
26 September 2027 to 31 December 2027
7.5 hours ahead
97 days
Best time for a meeting between IST and NZDT
When NZDT is 7.5 hours ahead of IST: 1 shared office hour, 09:00 to 10:00 in IST (16:30 to 17:30 in NZDT).
When NZDT is 6.5 hours ahead of IST: 2 shared office hours, 09:00 to 11:00 in IST (15:30 to 17:30 in NZDT).
Frequently asked questions about IST and NZDT time
How many hours ahead is NZDT of IST?
NZDT (UTC+13) is 7.5 hours ahead of IST (UTC+5:30).
Does the time difference between IST and NZDT change?
Yes. It is usually 7.5 hours ahead, but changes when one side moves its clocks: 6.5 hours ahead from 4 April to 25 September 2027.