CAT to GMT Converter & Meeting Planner
Quick answer: 9:00 AM CAT = 7:00 AM GMT (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 Greenwich Mean Time (GMT)? You need to account for the standard time difference. Greenwich Mean Time is normally 2 hours behind Central Africa Time. Whether you are coordinating between teams in Johannesburg and Harare and London and Dublin, 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 = 10:00 PM GMT. The full 24-hour CAT to GMT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM CAT = 1:00 PM GMT.
| CAT Time | GMT Time |
|---|---|
| 12:00 AM (00:00) | 10:00 PM (22:00)-1 day |
| 1:00 AM (01:00) | 11:00 PM (23:00)-1 day |
| 2:00 AM (02:00) | 12:00 AM (00:00) |
| 3:00 AM (03:00) | 1:00 AM (01:00) |
| 4:00 AM (04:00) | 2:00 AM (02:00) |
| 5:00 AM (05:00) | 3:00 AM (03:00) |
| 6:00 AM (06:00) | 4:00 AM (04:00) |
| 7:00 AM (07:00) | 5:00 AM (05:00) |
| 8:00 AM (08:00) | 6:00 AM (06:00) |
| 9:00 AM (09:00) | 7:00 AM (07:00) |
| 10:00 AM (10:00) | 8:00 AM (08:00) |
| 11:00 AM (11:00) | 9:00 AM (09:00) |
| 12:00 PM (12:00) | 10:00 AM (10:00) |
| 1:00 PM (13:00) | 11:00 AM (11:00) |
| 2:00 PM (14:00) | 12:00 PM (12:00) |
| 3:00 PM (15:00) | 1:00 PM (13:00) |
| 4:00 PM (16:00) | 2:00 PM (14:00) |
| 5:00 PM (17:00) | 3:00 PM (15:00) |
| 6:00 PM (18:00) | 4:00 PM (16:00) |
| 7:00 PM (19:00) | 5:00 PM (17:00) |
| 8:00 PM (20:00) | 6:00 PM (18:00) |
| 9:00 PM (21:00) | 7:00 PM (19:00) |
| 10:00 PM (22:00) | 8:00 PM (20:00) |
| 11:00 PM (23:00) | 9:00 PM (21:00) |
Best time to call London from Johannesburg
For most work calls, compare the normal business day in Johannesburg (CAT) with the business day in London (GMT). CAT commonly covers Southern Africa, Central Africa, while GMT is mainly associated with Europe, 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 10:00 AM - 5:00 PM CAT, which corresponds to 9:00 AM - 4:00 PM GMT. This window sits inside the typical CAT workday (8:00 AM - 5:00 PM) and the GMT workday (9:00 AM - 5:00 PM).
- DST Safety: CAT or GMT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Johannesburg Stock Exchange (JSE): 09:00-17:00 local time in Johannesburg.
- London Stock Exchange: 08:00-16:30 local time in London.
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Frequently Asked Questions
What is the time difference between CAT and GMT?
During standard time, Greenwich Mean Time is 2 hours behind 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.
What is the difference between GMT and BST?
GMT (Greenwich Mean Time) is the UK's standard winter offset at UTC+0, observed from the last Sunday in October through the last Sunday in March. BST (British Summer Time) is the daylight saving offset at UTC+1, applied each summer when clocks advance one hour.
Is GMT the same as UTC?
GMT and UTC share exactly the same numerical offset — both represent UTC+00:00 — but they are fundamentally different in nature. UTC is an atomic-clock-based international time standard used as the global reference, while GMT is a geographic time zone legally observed by specific countries including the United Kingdom and Ireland during winter months.