International calling guide
Vietnam runs on ICT (UTC+7) year-round with no daylight saving. Business operates Monday–Friday, 8 AM–5:30 PM in Hanoi and Ho Chi Minh City. Tết (Lunar New Year) causes multi-day closures. Best window: 9–11 AM ICT on a Tuesday or Wednesday.
Vietnam
+84 · UTC
Local Time Now
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See the live time gap between a global reference city and Vietnam at a glance no calculator needed.
Reference
New Delhi Time Now
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Destination
Hanoi, Vietnam Time Now
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Vietnam runs on ICT (UTC+7) year-round. Tết (Lunar New Year) causes the most significant annual business disruption.
Pro tip: Call 9–11 AM ICT on a Tuesday or Wednesday — never during Tết.
Vietnam uses ICT (UTC+7) permanently — same as Thailand and Cambodia. No seasonal clock changes.
Business hours in Hanoi and Ho Chi Minh City run 8 AM–5:30 PM Monday–Friday. The growing tech sector often works flexible hours.
Tết is Vietnam's biggest holiday — officially 3 days but businesses commonly close for 5–7 days. Most activity pauses for the full holiday week. This is the most critical closure to plan around.
Vietnamese is the business language. English is used at international companies and in Ho Chi Minh City's startup scene. Outreach in English works at multinationals; Vietnamese is preferred elsewhere.
The time differences range from 8 hours ahead of UTC to 5 hours behind UTC, showcasing the diverse time zones across the globe.
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The right window doubles your answer rate. The wrong one sends you straight to voicemail.
Avoid
Call during Tết Nguyên Đán (Lunar New Year, Jan/Feb — 5 days)
Best Window
Tue–Wed, 9–11 AM ICT
Avoid
Ring without knowing ICT (UTC+7)
Best Window
Fixed offset — no DST in Vietnam
Avoid
Call during Reunification Day (Apr 30–May 1)
Best Window
Schedule around the long weekend
Avoid
Call after 5:30 PM (Hanoi/HCMC close)
Best Window
9–11 AM ICT, Tue or Wed
Smart timing isn't just courtesy it directly drives better outcomes for every call you make.
Morning calls (9–11 AM ICT) on Tue–Wed in Hanoi or HCMC double pickup vs. cold Tết dials.
2×
more pickups
Knowing Vietnam's ICT (UTC+7) fixed offset shows scheduling precision to Vietnamese contacts.
+38%
connect rate
Pre-confirmed calls see 4× more engagement than cold outreach in Vietnam.
4×
engagement
Calling during Tết Nguyên Đán sends 90% of Vietnam calls straight to voicemail.
−90%
voicemail drops
Use these resources to plan every international call with confidence.
Set reminders and plan calls in advance so you never miss the optimal window.
Leverage automated analytics to identify the best call timing for every contact.
Instantly translate your local time to the recipient's timezone before dialling.
Professional outreach with automated scheduling features built into your CRM.
Four simple steps for every international call to Vietnam dial it right, every time.
Press "+" on mobile or "00" from most landlines. This opens an international line.
Vietnam's international code. Every call to Vietnam must start with +84.
Add the local area or mobile network code — always drop any leading zero used for domestic calls.
Dial the remaining subscriber digits. Your number is now correctly formatted for international routing.
Jump to any country's best-time-to-call guide. Click any flag to open the full page.
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Everything you need to know about timing, time zones, and dialing Vietnam (+84). Still have a question? Our wholesale team is one click away.
Tuesday–Wednesday, 9–11 AM ICT (UTC+7). Vietnam uses Indochina Time year-round with no DST — a fixed, reliable offset shared with Thailand and Cambodia. Business operates Monday–Friday, 8 AM–5:30 PM in Hanoi and Ho Chi Minh City. Vietnam is one of Southeast Asia's fastest-growing economies with a strong manufacturing and services sector.