Japan Standard Time (jst) is used in Japan. The IANA timezone identifier is Asia/Tokyo.

Argentina Time (art) is used in Argentina. The IANA timezone identifier is America/Argentina/Buenos_Aires.

JST to ART Time Converter

Japan Standard Time → Argentina Time

JST = UTC+9ART = UTC-3

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

ART (Buenos Aires)

Argentina · -12h

21:00-1 day

London

United Kingdom · -8h

01:00

New York

USA · -13h

20:00-1 day

Dubai

United Arab Emirates · -5h

04:00

Sydney

Australia · +1h

10:00

JST (Tokyo) to ART (Buenos Aires) — exact time difference

JST (Tokyo) is 12 hours ahead of ART (Buenos Aires). Midday in JST (Tokyo) lines up with 00:00 in ART (Buenos Aires).

JST (Tokyo) is in the Asia/Tokyo timezone. ART (Buenos Aires) is in America/Argentina/Buenos_Aires. The difference is 12 hours.

Working hours overlap

JST (Tokyo) and ART (Buenos Aires) have no shared working hours under a standard 9:00–17:00 schedule. One side will always need to join at an off-hour.

When to schedule across time zones

Since JST (Tokyo) and ART (Buenos Aires) don't share working hours, these are the most practical options available.

04:00 Tokyo / 16:00 Buenos Aires⚡ One side off-hours

⚠️ 5h before working hours in Tokyo

09:00 Tokyo / 21:00 Buenos Aires⚡ One side off-hours

⚠️ 5h after working hours in Buenos Aires

16:00 Tokyo / 04:00 Buenos Aires⚡ One side off-hours

⚠️ 5h before working hours in Buenos Aires

Based on standard 09:00–17:00 working hours in each location's local time.

Upcoming public holidays

⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.

JST (Tokyo)7 holidays

Jul 20Marine Day

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

ART (Buenos Aires)6 holidays

Jul 9Independence DaySOON

Aug 17General José de San Martín Memorial Day

Oct 12Day of Respect for Cultural Diversity

Nov 23National Sovereignty Day

Dec 8Immaculate Conception Day

How to work with JST (Tokyo) and ART (Buenos Aires) time zones

Working across JST (Tokyo) (Japan) and ART (Buenos Aires) (Argentina) is a challenge — the 12-hour difference means no shared business hours window under a standard schedule. Flexibility from at least one side is required.

💡 How to schedule across these time zones

⚡

When JST (Tokyo) is at 04:00, ART (Buenos Aires) reads 16:00 — 5h before working hours in Tokyo.

⚡

When JST (Tokyo) is at 09:00, ART (Buenos Aires) reads 21:00 — 5h after working hours in Buenos Aires.

⚡

When JST (Tokyo) is at 16:00, ART (Buenos Aires) reads 04:00 — 5h before working hours in Buenos Aires.

Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.

DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.

Get the Extension — Free →

Use the time slider above to find the exact equivalent time for any moment in JST (Tokyo). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.

JST (Tokyo) ↔ ART (Buenos Aires)

No overlap — one side will join outside working hours

JST (Tokyo)

ART (Buenos Aires)