How many hours is EST behind NZDT?
As abbreviations, NZDT is always 18 hours ahead of EST: EST is UTC−5 and NZDT is UTC+13. To convert, add 18 hours.
Check which label you actually need: EST (Eastern Time is on EDT today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now NZDT is 17 hours ahead of EST.
When the EST to NZDT time difference changes
For most of the year NZDT is 16 hours ahead of EST. From 27 September to 31 October 2026, NZDT is 17 hours ahead of EST 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 EST | Length |
|---|---|---|
| 27 September 2026 to 31 October 2026 | 17 hours ahead | 35 days |
| 1 November 2026 to 31 December 2026 | 18 hours ahead | 61 days |
| 1 January 2027 to 13 March 2027 | 18 hours ahead | 72 days |
| 14 March 2027 to 3 April 2027 | 17 hours ahead | 21 days |
| 4 April 2027 to 25 September 2027 | 16 hours ahead | 175 days |
| 26 September 2027 to 6 November 2027 | 17 hours ahead | 42 days |
| 7 November 2027 to 31 December 2027 | 18 hours ahead | 55 days |
Best time for a meeting between EST and NZDT
- When NZDT is 16 hours ahead of EST: no shared 09:00 to 17:00 hours; try 17:00 in EST (09:00 in NZDT).
- When NZDT is 18 hours ahead of EST: no shared 09:00 to 17:00 hours; one side has to take the call outside office hours.
- When NZDT is 17 hours ahead of EST: no shared 09:00 to 17:00 hours; one side has to take the call outside office hours.