New York is 5 zones west of GMT. New Zealand is 12 zones east of GMT.
-- If both places are on Standard time, or both are on Daylight/Summer/Fast time, then it's 11:00 PM Sunday night anywhere in New Zealand.
-- If only New York is on Daylight time, then it's 10:00 PM in New Zealand.
-- If only New Zealand is on Daylight time ... (I'm not even sure they do Daylight time over there) ... then it's 12:00 midnight Sunday night in New Zealand.
The difference in time between New York and Auckland, New Zealand, is due to the fact that the Earth rotates from west to east, causing different locations to experience daylight hours at different times. Given that New York is on the western hemisphere and Auckland is in the southern hemisphere, there's also a significant longitudinal difference. Without considering Daylight Saving Time changes, Auckland is usually 16 hours ahead of New York. This means when it's 6:00 AM Sunday in New York, it's 10:00 PM Sunday in Auckland. However, because New Zealand observes Daylight Saving Time, during certain months, Auckland can be 17 hours ahead. Therefore, it's always best to check a reliable world clock to get the exact time difference during different periods of the year.
If it is 6:00 AM Sunday in New York and New York is on Standard Time, then it is 12:00 AM Monday in Auckland, New Zealand. If New York is on Daylight Saving Time, then it is 11:00 PM Sunday in Auckland. The calculation considers their respective time zones and whether DST is in effect.
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