HST to NZDT Time Converter

Common Times Converted

HST on the left, NZDT on the right.

HST to NZDT: Full 24-Hour Conversion Table

Shaded rows are working hours; the darker shade marks the hours when both zones are at work.

What HST and NZDT Actually Are

HST — Hawaii Standard Time

Honolulu and the rest of Hawaii. Standing at UTC-10:00 as written, and the region does not change its clocks, so that offset holds all year. Hawaii does not observe daylight saving, so this offset holds all year.

Hawaii dropped daylight saving in 1967 and never resumed it. Being close to the equator, its daylight barely varies across the year, so there is little to gain.

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

The date changes mid-working-day

For 8 of the eight hours in a normal HST working day, the equivalent NZDT time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.

This gap is not fixed

NZDT changes its clocks and HST 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.

Nearly opposite sides of the clock

At 23 hours apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.

Major Cities in Each Zone

Cities on HST

Cities on NZDT