What is the time difference between Tokyo and Hanoi?

Tokyo (JST, UTC+9) is always 2 hours ahead of Hanoi (ICT, UTC+7). Neither country observes Daylight Saving Time, so this gap never changes.

Does Japan or Vietnam use Daylight Saving Time?

No. Japan abolished DST in 1952 and Vietnam has never observed it. The Tokyo–Hanoi offset is a fixed 2 hours every day of the year.

What are the overlapping business hours between Tokyo and Hanoi?

Assuming standard office hours of 09:00–18:00 local time, the overlap window is 09:00–18:00 Hanoi = 11:00–20:00 Tokyo. In practice, teams often treat 09:00–16:00 Hanoi (11:00–18:00 Tokyo) as the comfortable shared window.

If it is noon in Tokyo, what time is it in Hanoi?

10:00. Subtract 2 hours from any Tokyo time to get Hanoi time, or add 2 hours to any Hanoi time to get Tokyo time.

What timezone identifier should I use for Tokyo?

Use "Asia/Tokyo" (JST, UTC+9). For Hanoi use "Asia/Ho_Chi_Minh" or "Asia/Bangkok" (both ICT, UTC+7).

Time Difference: Tokyo to Hanoi

Name: Time Difference: Tokyo to Hanoi
Availability: InStock
Author: Nham Vu

See the live time in both Tokyo and Hanoi and convert any hour between JST and ICT instantly.

Tokyo

--:--:--

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JST (UTC+9)

Hanoi

--:--:--

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ICT (UTC+7)

Current offset

Tokyo is 2 hours ahead of Hanoi

Neither Japan nor Vietnam observes Daylight Saving Time — the gap is always exactly 2 hours.

24-Hour Meeting Planner

Each column is one hour. Green = both cities in business hours (09:00–18:00). Red = Tokyo only. Orange = Hanoi only. Gray = outside business hours.

Overlap (both in office) Tokyo office Hanoi office Outside office

Convert a Specific Time

Tokyo → Hanoi

Tokyo: = --:00

Hanoi → Tokyo

Hanoi: = --:00

Summary

See the live time in both Tokyo and Hanoi and convert any hour between JST and ICT instantly.

How it works

The tool reads your browser clock and converts it to both Tokyo (JST, UTC+9) and Hanoi (ICT, UTC+7) using their IANA timezone identifiers.
Neither Japan nor Vietnam observes Daylight Saving Time, so the offset is a fixed 2 hours throughout the year.
Live clocks update every second so you always see the current local time in each city.
The time converter lets you pick any Tokyo hour and instantly shows the matching Hanoi hour, noting when the result falls on the next or previous calendar day.
The meeting planner grid highlights business hours (09:00–18:00) for each city across all 24 hours so you can spot call windows at a glance.

Use cases

Schedule video calls between a Tokyo office and a Hanoi team.
Check whether a Hanoi colleague is still at work when it is late afternoon in Tokyo.
Convert a flight departure time in Tokyo to local Hanoi arrival context.
Plan client meetings that work for both Japan and Vietnam participants.
Confirm the exact Hanoi time before sending a time-sensitive message.
Understand the fixed 2-hour gap without mental arithmetic.

Frequently Asked Questions

Last updated: 2026-07-26 · Reviewed by Nham Vu