JST to ART Converter & Meeting Planner
Quick answer: 9:00 AM JST = 9:00 PM ART (fixed +09:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Japan Standard Time (JST) and Argentina Time (ART)? You need to account for the standard time difference. Argentina Time is normally 12 hours behind Japan Standard Time. Whether you are coordinating between teams in Tokyo and Osaka and Buenos Aires and Córdoba, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM JST = 12:00 PM ART. The full 24-hour JST to ART table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM JST = 3:00 AM ART.
| JST Time | ART Time |
|---|---|
| 12:00 AM (00:00) | 12:00 PM (12:00)-1 day |
| 1:00 AM (01:00) | 1:00 PM (13:00)-1 day |
| 2:00 AM (02:00) | 2:00 PM (14:00)-1 day |
| 3:00 AM (03:00) | 3:00 PM (15:00)-1 day |
| 4:00 AM (04:00) | 4:00 PM (16:00)-1 day |
| 5:00 AM (05:00) | 5:00 PM (17:00)-1 day |
| 6:00 AM (06:00) | 6:00 PM (18:00)-1 day |
| 7:00 AM (07:00) | 7:00 PM (19:00)-1 day |
| 8:00 AM (08:00) | 8:00 PM (20:00)-1 day |
| 9:00 AM (09:00) | 9:00 PM (21:00)-1 day |
| 10:00 AM (10:00) | 10:00 PM (22:00)-1 day |
| 11:00 AM (11:00) | 11:00 PM (23:00)-1 day |
| 12:00 PM (12:00) | 12:00 AM (00:00) |
| 1:00 PM (13:00) | 1:00 AM (01:00) |
| 2:00 PM (14:00) | 2:00 AM (02:00) |
| 3:00 PM (15:00) | 3:00 AM (03:00) |
| 4:00 PM (16:00) | 4:00 AM (04:00) |
| 5:00 PM (17:00) | 5:00 AM (05:00) |
| 6:00 PM (18:00) | 6:00 AM (06:00) |
| 7:00 PM (19:00) | 7:00 AM (07:00) |
| 8:00 PM (20:00) | 8:00 AM (08:00) |
| 9:00 PM (21:00) | 9:00 AM (09:00) |
| 10:00 PM (22:00) | 10:00 AM (10:00) |
| 11:00 PM (23:00) | 11:00 AM (11:00) |
Best time to call Buenos Aires from Tokyo
For most work calls, compare the normal business day in Tokyo (JST) with the business day in Buenos Aires (ART). JST commonly covers East Asia, while ART is mainly associated with South America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 9:00 PM JST, which reaches 9:00 AM ART near the start of their workday.
- DST Safety: Neither JST nor ART uses Daylight Saving Time in our dataset, making business-hour relationships stable year-round.
- Tokyo Stock Exchange (TSE): 09:00-15:00 local time in Tokyo.
- Buenos Aires Stock Exchange (BCBA): 11:00-17:00 local time in Buenos Aires.
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Frequently Asked Questions
What is the time difference between JST and ART?
During standard time, Argentina Time is 12 hours behind Japan Standard Time.
Does Japan observe Daylight Saving Time?
Japan has not observed Daylight Saving Time since 1951, when the practice introduced during the Allied occupation was abolished by the Japanese government. JST has remained fixed at UTC+9:00 ever since, and there is no current legislation to reintroduce DST in Japan.
Is JST the same as Korean Standard Time (KST)?
Yes, South Korea's Korean Standard Time (KST) operates at the same UTC+9:00 offset as JST, and South Korea also does not observe Daylight Saving Time. The two countries share an identical clock year-round, which simplifies scheduling for the significant trade, technology, and cultural exchange between Tokyo and Seoul.
Does Argentina observe Daylight Saving Time?
Argentina permanently abolished Daylight Saving Time in 2009 after years of inconsistent observance. Since then, ART has remained fixed at UTC-03:00 every day of the year, with no seasonal clock changes of any kind.
Are Argentina Time (ART) and Brasilia Time (BRT) the same?
ART and BRT are distinct, separately designated time zones, but they currently share the exact same UTC-03:00 offset. Because neither Argentina nor Brazil's southeastern states currently observe DST, the two zones remain perfectly aligned year-round — though that alignment could change if either country's DST policy shifts.