Honolulu, United States

Honolulu keeps Hawaii Standard Time (HST) at UTC−10 all year. Hawaii does not observe daylight saving time, so the offset never changes.

A sunrise meeting at 7 AM in Honolulu catches noon in New York, 5 PM in London, and 2 AM the next day in Tokyo. This remote position can make same-day collaboration with Europe nearly impossible.

Hawaii’s strategic mid-Pacific location makes it a vital military and scientific outpost, with observatories and naval bases that require round-the-clock time coordination with both Asian and American mainland partners.