Because Okinawa is a small tropical island outside the mainland that is a popular vacation destination just like Hawaii is for the US
Okinawa
It's short for "Shima" which means "Island"
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By boat or aircraft.
Hokkaido is like russia. Okinawa is like Hawaii
If you choose to fly from Hawaii eastward to Okinawa, you never cross the International Dateline, so you've cleverly eliminated the whole problem.
The phone number of the Maui Okinawa Cultural Center is: 808-242-1560.
The address of the Maui Okinawa Cultural Center is: 688 Nukuwai Pl, Wailuku, HI 96793
About 7,774 kilometers (4,830 miles) as the bird flies...
If you choose to fly from Hawaii eastward to Okinawa, you never cross the International Dateline, so you've cleverly eliminated the whole problem.
It is called the Yen
Nikkei