New Zealand operates under two time zones:

New Zealand Standard Time (NZST) – UTC +12

This is the time zone during winter (from the first Sunday in April to the last Sunday in September).

New Zealand Daylight Time (NZDT) – UTC +13

This is during summer when daylight saving is in effect (from the last Sunday in September to the first Sunday in April).

During daylight saving time, clocks are moved one hour forward, providing more daylight in the evening. This means in the summer, New Zealand is 13 hours ahead of Coordinated Universal Time (UTC +13), and in winter, it's 12 hours ahead (UTC +12)