This is going to be interesting. Let's say my flight starts on day 1. I fly from Yap (in the Federated States of Micronesia) to Guam and arrive a full day after I leave (on day 2, 25.5 hours later in calendar time). I spend the night in Guam, and wake up on day 3. Then, I fly from Guam to Honolulu and lose 2 calendar days, arriving back in time on day 1. After a short layover, I get on a plane to New York from Honolulu, and arrive the next morning, on day 2. Entering this itinerary into my travel calendar was not easy.