What will the impact be when crossing international dateline from rarotonga to Auckland?

Crossing the International Date Line from Rarotonga to Auckland will result in a gain of one day.

Explanation:

Rarotonga is located in the Cook Islands, which is in the UTC-10 timezone. Auckland, on the other hand, is located in New Zealand, which is in the UTC+12 timezone. When traveling from Rarotonga to Auckland, you will be crossing 22 timezones. Since you are moving from a negative to a positive timezone, you will gain 22 hours. However, since you cross the International Date Line, you will skip a calendar day. So, if you depart Rarotonga on, let's say, May 10th, 10:00 PM local time (UTC-10), you will arrive in Auckland on May 12th, 12:00 PM local time (UTC+12).