Africa Time Zone Abbreviations: A Complete Reference

Africa time zone abbreviations: A Complete Reference

WAT: West Africa Time (UTC+1)

Fourteen countries run on WAT. Nigeria, the continent’s most populous nation, keeps its entire territory on a single offset. Angola, Benin, Cameroon, the Central African Republic, Chad, Equatorial Guinea, Gabon, Niger, the Republic of the Congo, and the Democratic Republic of the Congo’s western regions all share the same clock.

Offices typically run 08:00 to 17:00, Monday to Friday. The Nigerian Exchange opens at 09:30 WAT. Banking hours are generally 08:00 to 16:00 on weekdays. Friday afternoons in Muslim-majority areas may close early for Jumu’ah prayer.

WAT sits one hour ahead of GMT. When London is at 09:00, Lagos is at 10:00. That single hour of difference makes WAT the easiest African zone for European business: the morning overlap is nearly a full working day.

CAT: Central Africa Time (UTC+2)

CAT is 2 hours ahead of GMT. When London is at 09:00, Harare is at 11:00.

The morning overlap with European business hours is generous: a full working day can be shared between CAT and Central European Time with minimal adjustment. The Johannesburg Stock Exchange opens at 09:00 SAST and closes at 17:00. For traders in London, that means a 07:00 GMT start during British winter and an 08:00 BST start during British summer. The JSE’s afternoon session overlaps with the opening of New York markets.

Botswana, Burundi, the Democratic Republic of the Congo’s eastern regions, Eswatini, Lesotho, Malawi, Mozambique, Namibia, Rwanda, South Africa, South Sudan, Sudan, Zambia, and Zimbabwe all operate on CAT. South Sudan adopted the offset upon independence in 2011. Namibia abandoned DST in 2017 and now stays fixed on CAT year-round.

EAT: East Africa Time (UTC+3)

Kenya is the largest economy on EAT. Offices in Nairobi and Addis Ababa typically open at 08:00 EAT. The Nairobi Securities Exchange opens at 09:00 EAT, which is 06:00 GMT. Banking hours run 08:00 to 16:00 on weekdays.

Comoros, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Mayotte, Somalia, Tanzania, and Uganda all use EAT. The zone covers the Horn of Africa and stretches south through the Swahili coast to Madagascar.

EAT is 3 hours ahead of GMT. When New York opens at 09:00 Eastern, Nairobi is at 16:00 or 17:00 depending on US daylight saving. The overlap is tight: one or two hours at most.

SAST: South African Standard Time (UTC+2)

SAST is the time zone of the Johannesburg Stock Exchange, the largest stock exchange in Africa. It opens at 09:00 SAST, which is 07:00 GMT.

The offset is identical to CAT: UTC+2. South Africa, Lesotho, and Eswatini use the SAST label. The name is distinct but the clock reads the same. No DST applies.

GMT: Greenwich Mean Time (UTC+0) in Africa

Not every West African country runs on WAT. Ghana, Ivory Coast, Burkina Faso, Gambia, Guinea, Guinea-Bissau, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, and Togo all keep GMT year-round.

Ghana is the most common point of confusion. It sits in West Africa but does not use West Africa Time. When Nigeria is at 10:00, Accra is at 09:00.

Morocco and Western Sahara also use UTC+0 as their standard offset, but with a complication: DST pushes them to UTC+1 outside Ramadan. The IANA database lists their abbreviation as blank; no short code applies.

Cabo Verde runs on UTC-1, the only African territory west of GMT. No abbreviation is assigned.

CET in Africa: Algeria and Tunisia

Algeria and Tunisia use CET, the same abbreviation as Central European Time. The offset is UTC+1, identical to WAT. Neither country observes DST.

The abbreviation matters because it implies European alignment. A scheduling app that sees “CET” may assume a DST transition in March and October. Algeria and Tunisia do not shift. The clock stays fixed while Europe springs forward and falls back.

EET in Africa: Libya

Libya runs on EET: UTC+2, same offset as CAT and SAST. No DST applies.

EET vs CAT: same offset, different name

Tripoli and Lusaka share the same UTC+2 offset. One uses EET, the other CAT. The practical difference is zero: neither observes DST. The naming difference matters only in software that parses abbreviations literally.

EEST: Egypt’s Summer Time

Egypt is the only African country using EEST. The offset is UTC+3, same as EAT, but only during DST. Egypt’s DST status has been volatile: abolished in 2015, reinstated in 2023, abolished again in 2024. The October 2026 IANA data shows Egypt on EEST, implying DST is active. Check annually.

Morocco and Western Sahara also observe DST, shifting to UTC+1, but no abbreviation is assigned to their summer offset. Morocco suspends DST during Ramadan, reverting to standard time for the holy month. Ramadan dates shift roughly 11 days earlier each Gregorian year, so the suspension period moves.

No other African country observes DST.

Mauritius, Seychelles, Reunion, Mayotte: UTC+4

Four Indian Ocean territories run on UTC+4. Mauritius uses Indian/Mauritius. Seychelles and Reunion alias to Asia/Dubai. Mayotte aliases to Africa/Nairobi for EAT at UTC+3.

No abbreviation is assigned to any of the UTC+4 zones. The offset puts them 4 hours ahead of GMT, 1 hour ahead of EAT, and aligned with Dubai.

Why abbreviations break

WAT, CAT, and EAT are the three most common African time zone abbreviations. They are sequential: UTC+1, UTC+2, UTC+3. That sequence is easy to remember. The country assignments are not.

A programmer writing “CAT” into a scheduling app might mean UTC+2. The app might interpret it as Central Australia Time, which is UTC+9:30 with DST. The result is a meeting off by seven and a half hours. IANA names prevent this. Use Africa/Harare, not “CAT”.

Abbreviation confusion runs deeper. CET appears for Algeria and Tunisia but carries European DST baggage. EET appears for Libya but Libya does not change clocks. GMT is used loosely to mean UTC+0 year-round. SAST and CAT are the same offset under different names. Ghana is in West Africa but not on WAT. The Democratic Republic of the Congo spans two offsets but has four IANA zones.

If you build scheduling tools, trading platforms, or travel software that serves African users, stop relying on abbreviations and switch to IANA zone names. The abbreviations are ambiguous, DST rules change, and your users deserve better than a guess. For everyone else: when you see “CAT” or “EAT” in a meeting invitation, verify the country before you show up an hour early or late.