There is no overlap between 09:00–18:00 working days in these two places.
How many hours is GMT behind NZDT?
As abbreviations, NZDT is always 13 hours ahead of GMT: GMT is UTC+0 and NZDT is UTC+13. To convert, add 13 hours.
When the GMT to NZDT time difference changes
For most of the year NZDT is 13 hours ahead of GMT. From 4 April to 25 September 2027, NZDT is 12 hours ahead of GMT 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 GMT
Length
27 September 2026 to 31 December 2026
13 hours ahead
96 days
1 January 2027 to 3 April 2027
13 hours ahead
93 days
4 April 2027 to 25 September 2027
12 hours ahead
175 days
26 September 2027 to 31 December 2027
13 hours ahead
97 days
Best time for a meeting between GMT and NZDT
When NZDT is 13 hours ahead of GMT: no shared 09:00 to 17:00 hours; try 07:00 in GMT (20:00 in NZDT).
When NZDT is 12 hours ahead of GMT: no shared 09:00 to 17:00 hours; try 07:00 in GMT (19:00 in NZDT).
Frequently asked questions about GMT and NZDT time
How many hours ahead is NZDT of GMT?
NZDT (UTC+13) is 13 hours ahead of GMT (UTC+0).
Does the time difference between GMT and NZDT change?
Yes. It is usually 13 hours ahead, but changes when one side moves its clocks: 12 hours ahead from 4 April to 25 September 2027.