Smart hours to call Vietnam (+84)
Vietnam runs on ICT — seven hours ahead of GMT, with a distinct midday break culture. Knowing the best time to call Vietnam on +84 keeps you inside Hanoi and Ho Chi Minh City office hours.
ICT, at a glance.
See the live gap between a global reference city and Vietnam's single ICT zone — no calculator needed.
Vietnam against the world's hubs.
Compare live Vietnamese time against New York, London and Dubai so your call lands inside Ho Chi Minh City office hours.
Understanding the time difference between the United States and Vietnam
Time zone differences across other major countries
Why timing matters for calls to Vietnam.
Vietnamese offices often close for an extended midday rest — call before noon ICT or after 1:30 PM to catch active desks.
The best windows to reach Vietnam.
Four factors that decide when a Vietnamese prospect picks up — anchored to the single ICT business day.
Vietnam runs at +07:00
The zone is Asia/Ho_Chi_Minh. Every window on this page is worked out from that offset rather than a rule of thumb, so the times shown are the ones that actually apply to Vietnam.
No daylight saving
Vietnam stays on +07:00 all year. The windows below only move when the caller's own country changes its clocks, not when Vietnam does.
Shared hours with 3 of 5 markets
Callers in London, Mumbai, Sydney share part of the working day with Vietnam. The table above gives the exact intersection for each.
Where the gap is too wide
There is no 9-to-5 overlap with New York, Los Angeles. Calling Vietnam from those cities means someone is working outside normal hours — worth saying so when you book the call.
How to call Vietnam using the +84 code.
Four simple steps for every call into Vietnam — including the leading-zero rule.
Number anatomy
Dial exit code
Press + on mobile or 00 from most landlines. This opens an international line.
Enter +84
Vietnam's international code. Every call to Vietnam must start with +84.
Area prefix
Add the local area or mobile network code — always drop any leading zero used for domestic calls.
Full number
Dial the remaining subscriber digits. Your number is now correctly formatted for international routing.
Best time to call — every country.
Jump to any country's best-time-to-call guide. Search by name, ISO or dial prefix.
Reach Vietnamese customers in their window, on carrier-grade routes.
Free trial · No card required · Port numbers free · Month-to-month
When your working day overlaps Vietnam
Callers in London, Mumbai and Sydney share part of the working day with Vietnam. There is no shared working window with New York and Los Angeles.
| Calling from | Vietnam is | Call at (your time) | Which is (their time) |
|---|---|---|---|
| New York | 12h ahead | No shared working hours — you would need to call outside 9am-5pm | |
| Los Angeles | 15h ahead | No shared working hours — you would need to call outside 9am-5pm | |
| London | 7h ahead | 9:00 AM – 10:00 AM | 4:00 PM – 5:00 PM |
| Mumbai | 1h 30m ahead | 9:00 AM – 3:30 PM | 10:30 AM – 5:00 PM |
| Sydney | 4h behind | 1:00 PM – 5:00 PM | 9:00 AM – 1:00 PM |
Windows are the intersection of a 9am-5pm working day in each place, using Vietnam'sstandard-time offset of +07:00. Vietnam does not observe daylight saving, so these windows hold all year — though they shift when the caller's own country changes its clocks.
FAQ
Calling Vietnam, answered.
Time zone, daylight saving and dialling questions for Vietnam (+84).