Hong Kong is 1 hour ahead of Hanoi. Hanoi uses Indochina Time (ICT, UTC+7) while Hong Kong uses Hong Kong Time (HKT, UTC+8). When it's 12:00 PM in Hanoi, it's 1:00 PM in Hong Kong.
Neither city observes daylight saving time, so the 1-hour difference remains constant year-round.
Best calling time: 8:00 AM - 4:00 PM Hanoi time. This corresponds to 9:00 AM - 5:00 PM in Hong Kong, covering Hong Kong business hours.
Hanoi and Hong Kong are connected by direct flights taking about 2 hours. Hong Kong is a major business hub for Vietnamese companies, and there's significant investment and trade between Vietnam and Hong Kong.