JST to CAT Converter & Meeting Planner
Quick answer: 9:00 AM JST = 2:00 AM CAT (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 Central Africa Time (CAT)? You need to account for the standard time difference. Central Africa Time is normally 7 hours behind Japan Standard Time. Whether you are coordinating between teams in Tokyo and Osaka and Johannesburg and Harare, 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 = 5:00 PM CAT. The full 24-hour JST to CAT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM JST = 8:00 AM CAT.
| JST Time | CAT Time |
|---|---|
| 12:00 AM (00:00) | 5:00 PM (17:00)-1 day |
| 1:00 AM (01:00) | 6:00 PM (18:00)-1 day |
| 2:00 AM (02:00) | 7:00 PM (19:00)-1 day |
| 3:00 AM (03:00) | 8:00 PM (20:00)-1 day |
| 4:00 AM (04:00) | 9:00 PM (21:00)-1 day |
| 5:00 AM (05:00) | 10:00 PM (22:00)-1 day |
| 6:00 AM (06:00) | 11:00 PM (23:00)-1 day |
| 7:00 AM (07:00) | 12:00 AM (00:00) |
| 8:00 AM (08:00) | 1:00 AM (01:00) |
| 9:00 AM (09:00) | 2:00 AM (02:00) |
| 10:00 AM (10:00) | 3:00 AM (03:00) |
| 11:00 AM (11:00) | 4:00 AM (04:00) |
| 12:00 PM (12:00) | 5:00 AM (05:00) |
| 1:00 PM (13:00) | 6:00 AM (06:00) |
| 2:00 PM (14:00) | 7:00 AM (07:00) |
| 3:00 PM (15:00) | 8:00 AM (08:00) |
| 4:00 PM (16:00) | 9:00 AM (09:00) |
| 5:00 PM (17:00) | 10:00 AM (10:00) |
| 6:00 PM (18:00) | 11:00 AM (11:00) |
| 7:00 PM (19:00) | 12:00 PM (12:00) |
| 8:00 PM (20:00) | 1:00 PM (13:00) |
| 9:00 PM (21:00) | 2:00 PM (14:00) |
| 10:00 PM (22:00) | 3:00 PM (15:00) |
| 11:00 PM (23:00) | 4:00 PM (16:00) |
Best time to call Johannesburg from Tokyo
For most work calls, compare the normal business day in Tokyo (JST) with the business day in Johannesburg (CAT). JST commonly covers East Asia, while CAT is mainly associated with Southern Africa, Central Africa.
⚠️ 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 3:00 PM - 6:00 PM JST, which corresponds to 8:00 AM - 11:00 AM CAT. This window sits inside the typical JST workday (9:00 AM - 6:00 PM) and the CAT workday (8:00 AM - 5:00 PM).
- DST Safety: Neither JST nor CAT 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.
- Johannesburg Stock Exchange (JSE): 09:00-17:00 local time in Johannesburg.
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Frequently Asked Questions
What is the time difference between JST and CAT?
During standard time, Central Africa Time is 7 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 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.