CAT to London
-1hCAT
CATSOURCELondon
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
CAT and BST on the World Map
The map below highlights the CAT (Central Africa Time) and BST (Greenwich Mean Time) timezone regions across the globe.
CAT – Central Africa Time
UTC+02:00Central Africa Time (CAT, UTC+02:00) covers Zimbabwe, Zambia, Mozambique, Malawi and neighbouring countries.
- •Central Africa Time is fixed at UTC+02:00 with no daylight saving.
- •CAT matches South Africa Standard Time (SAST) all year.
- •It is the same offset as Central European Time in winter.
- •Harare is level with Johannesburg and one hour ahead of Lagos.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
Understanding the -1h Gap: CAT vs London
CAT runs on Central Africa Time (CAT) at UTC+02:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts CAT 1 hour behind London — a difference of -1h at the current offsets.
In practice, when it is 9:00 AM in CAT it is 8:00 AM in London. Midnight in CAT is 11:00 PM in London.London observes daylight saving time while CAT does not, so the gap narrows or widens by an hour part of the year.
CAT to London time conversion table
| CAT (CAT) | London (BST) | Day |
|---|---|---|
| 12:00 AM | 11:00 PM | previous day |
| 6:00 AM | 5:00 AM | same day |
| 7:00 AM | 6:00 AM | same day |
| 8:00 AM | 7:00 AM | same day |
| 9:00 AM | 8:00 AM | same day |
| 12:00 PM | 11:00 AM | same day |
| 3:00 PM | 2:00 PM | same day |
| 5:00 PM | 4:00 PM | same day |
| 6:00 PM | 5:00 PM | same day |
| 9:00 PM | 8:00 PM | same day |
Why people convert CAT to London time
- Scheduling a call from CAT to London: a 10:00 AM start in CAT lands at 9:00 AM in London, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both CAT and London are inside the 9-to-5 working day between 10:00 AM and 5:00 PM CAT time (9:00 AM–4:00 PM BST). That is roughly 7 hours of usable overlap.
- Watching a live event or market open: CAT viewers need 8:00 AM in London to catch a 9:00 AM start there, and 1:00 AM if the event is anchored to CAT.
- Always state the zone abbreviation, not just the hour. "3:00 PM CAT" is unambiguous; "3 PM" across a -1h gap is not.
- Block 10:00 AM–5:00 PM CAT as the recurring meeting window if you work primarily from CAT and need London colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
About CAT (Central Africa Time)
Central Africa Time (CAT) is fixed at UTC+02:00 all year across a broad belt of southern and central Africa, including Zimbabwe, Zambia, Mozambique, Malawi, Rwanda, Burundi and the eastern Democratic Republic of the Congo. None of these countries observes daylight saving time, so CAT never shifts. It is the same offset as South Africa Standard Time (SAST) and the winter version of Central European Time, which makes CAT a convenient bridge between African, European and Middle Eastern schedules — Harare is level with Johannesburg all year and one hour ahead of Lagos.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
Best time to call between CAT and London
Both CAT and London sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM CAT, which is 9:00 AM–4:00 PM BST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
CAT and London share 7 hours of working-hours overlap (10:00 AM–5:00 PM CAT), so scheduling a live meeting is straightforward.
CAT is 1 hour behind London (CAT UTC+02:00 → BST UTC+01:00). The shared working window is 10:00 AM–5:00 PM CAT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
CAT
Does not observe DST
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between CAT and London?
CAT (CAT, UTC+02:00) is 1 hour behind London (BST, UTC+01:00). The gap is currently -1h.
How do I convert CAT time to London time?
Add -1h to CAT local time. For example, 9:00 AM in CAT is 8:00 AM in London.
What time is it in London right now?
London uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from CAT.
What is the best time to call London from CAT?
Call between 10:00 AM and 5:00 PM CAT — that maps to 9:00 AM–4:00 PM BST and keeps both parties inside the working day.
Which is behind, CAT or London?
CAT is 1 hour behind London. When it is 12:00 PM in CAT it is 11:00 AM in London.
Do CAT and London use different time zones?
CAT uses CAT at UTC+02:00, while London (UK) uses BST at UTC+01:00. The IANA identifiers are Africa/Harare and Europe/London.
Does daylight saving time affect the CAT–London difference?
Yes at the moment: London is on daylight saving time and CAT is not, so the -1h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share CAT's time zone?
CAT also covers Harare, Lusaka, Maputo, Lilongwe, Kigali.
Which countries use CAT, CAT's zone?
CAT is used in Zimbabwe, Zambia, Mozambique, Malawi, Rwanda, Burundi, DR Congo (east).
Is there a day difference between CAT and London?
Not normally. The -1h gap only pushes the date over the previous day.
What is the time difference between CAT and London?
London is -1h from CAT.
What timezone is CAT in?
CAT operates on its local timezone.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
Which countries use CAT (Central Africa Time)?
CAT is used in Zimbabwe, Zambia, Mozambique, Malawi, Rwanda, Burundi, and 1 more countries.
Does CAT observe daylight saving time?
No, CAT does not observe daylight saving time and remains at UTC+02:00 year-round.
What are some interesting facts about CAT?
Central Africa Time is fixed at UTC+02:00 with no daylight saving. CAT matches South Africa Standard Time (SAST) all year.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
When is it midnight in CAT, what time is it in London?
When it is 12:00 AM (midnight) in CAT (CAT), it is -1h later in London (GMT).
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