CAT to JST Converter & Meeting Planner
Quick answer: 9:00 AM CAT = 4:00 PM JST (fixed +02:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Central Africa Time (CAT) and Japan Standard Time (JST)? You need to account for the standard time difference. Japan Standard Time is normally 7 hours ahead of Central Africa Time. Whether you are coordinating between teams in Johannesburg and Harare and Tokyo and Osaka, 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 CAT = 7:00 AM JST. The full 24-hour CAT to JST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM CAT = 10:00 PM JST.
| CAT Time | JST Time |
|---|---|
| 12:00 AM (00:00) | 7:00 AM (07:00) |
| 1:00 AM (01:00) | 8:00 AM (08:00) |
| 2:00 AM (02:00) | 9:00 AM (09:00) |
| 3:00 AM (03:00) | 10:00 AM (10:00) |
| 4:00 AM (04:00) | 11:00 AM (11:00) |
| 5:00 AM (05:00) | 12:00 PM (12:00) |
| 6:00 AM (06:00) | 1:00 PM (13:00) |
| 7:00 AM (07:00) | 2:00 PM (14:00) |
| 8:00 AM (08:00) | 3:00 PM (15:00) |
| 9:00 AM (09:00) | 4:00 PM (16:00) |
| 10:00 AM (10:00) | 5:00 PM (17:00) |
| 11:00 AM (11:00) | 6:00 PM (18:00) |
| 12:00 PM (12:00) | 7:00 PM (19:00) |
| 1:00 PM (13:00) | 8:00 PM (20:00) |
| 2:00 PM (14:00) | 9:00 PM (21:00) |
| 3:00 PM (15:00) | 10:00 PM (22:00) |
| 4:00 PM (16:00) | 11:00 PM (23:00) |
| 5:00 PM (17:00) | 12:00 AM (00:00)+1 day |
| 6:00 PM (18:00) | 1:00 AM (01:00)+1 day |
| 7:00 PM (19:00) | 2:00 AM (02:00)+1 day |
| 8:00 PM (20:00) | 3:00 AM (03:00)+1 day |
| 9:00 PM (21:00) | 4:00 AM (04:00)+1 day |
| 10:00 PM (22:00) | 5:00 AM (05:00)+1 day |
| 11:00 PM (23:00) | 6:00 AM (06:00)+1 day |
Best time to call Tokyo from Johannesburg
For most work calls, compare the normal business day in Johannesburg (CAT) with the business day in Tokyo (JST). CAT commonly covers Southern Africa, Central Africa, while JST is mainly associated with East Asia.
⚠️ 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.
✅ The most practical overlap on 2026-07-05 is usually 8:00 AM - 11:00 AM CAT, which corresponds to 3:00 PM - 6:00 PM JST. This window sits inside the typical CAT workday (8:00 AM - 5:00 PM) and the JST workday (9:00 AM - 6:00 PM).
- DST Safety: Neither CAT nor JST uses Daylight Saving Time in our dataset, making business-hour relationships stable year-round.
- Johannesburg Stock Exchange (JSE): 09:00-17:00 local time in Johannesburg.
- Tokyo Stock Exchange (TSE): 09:00-15:00 local time in Tokyo.
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Frequently Asked Questions
What is the time difference between CAT and JST?
During standard time, Japan Standard Time is 7 hours ahead of Central Africa Time.
Does the Central Africa Time zone observe Daylight Saving Time?
None of the countries observing Central Africa Time use Daylight Saving Time. South Africa abolished DST in 1994, and no other CAT-observing nation currently applies seasonal clock changes — CAT remains permanently fixed at UTC+02:00 throughout the year.
Which major countries use Central Africa Time (CAT)?
Central Africa Time is observed by South Africa, Zimbabwe, Zambia, Botswana, Mozambique, Malawi, and Eswatini. South Africa is the zone's dominant economy, with Johannesburg functioning as the region's primary financial center and home to the Johannesburg Stock Exchange (JSE), Africa's largest equity market by capitalization.
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.