Hanoi is 12 hours ahead of New York during EST, and 11 hours ahead during EDT. Hanoi uses Indochina Time (ICT, UTC+7) while New York uses Eastern Time (EST/EDT). When it's 9:00 AM in New York, it's 9:00 PM the same day in Hanoi.
Vietnam does not observe daylight saving time while New York does, so the difference varies between 11-12 hours throughout the year.
Best calling time: 8:00 PM - 12:00 AM New York time. This corresponds to 8:00 AM - 12:00 PM the next day in Hanoi, catching morning business hours in Vietnam.
Hanoi and New York are connected via Asian hub cities, with travel typically taking 18-24 hours. Vietnam is a growing market for US businesses, with increasing trade and investment ties.