The time difference between Niue and mainland New Zealand is -23 hours during the Southern Hemisphere winter and -24 hours when the mainland uses Daylight Saving Time.
Air New Zealand flies to Niue once a week departing Auckland, New Zealand on Saturday morning. It is approximately a 3.5 hour flight. Since Niue is positioned on the opposite side of the international date line to New Zealand, you arrive into Niue on the Friday afternoon. When you depart Niue, you leave on a Friday afternoon, and arrive into Auckland, New Zealand late Saturday afternoon.