ACST to Nairobi
-6h 30mACST
ACSTSOURCENairobi
EATGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and EAT on the World Map
The map below highlights the ACST (Australian Central Standard Time) and EAT (East Africa Time) timezone regions across the globe.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •ACST uses a half-hour offset: UTC+09:30.
- •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
- •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
- •Adelaide is one of the few major cities on a 30-minute offset.
EAT – East Africa Time
UTC+03:00East Africa Time (EAT) is the time zone for East Africa, 3 hours ahead of UTC.
- •Nairobi is a major tech hub in Africa, often called 'Silicon Savannah'.
- •Ethiopia uses its own calendar, which is 7-8 years behind the Gregorian calendar.
- •EAT is the same offset as MSK (Moscow Time).
About Nairobi
WikipediaNairobi operates on East Africa Time (EAT), UTC+3. As the tech hub of Africa (Silicon Savannah), Nairobi leads African fintech and mobile innovation.
Nairobi National Park is the only national park within a capital city, with lions visible against the skyline.
Comparing Time Zones: ACST and Nairobi
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Nairobi runs on East Africa Time (EAT) at UTC+03:00. That puts ACST 6 hours 30 minutes behind Nairobi — a difference of -6h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 2:30 AM in Nairobi. Midnight in ACST is 5:30 PM in Nairobi. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to Nairobi time conversion table
| ACST (ACST) | Nairobi (EAT) | Day |
|---|---|---|
| 12:00 AM | 5:30 PM | previous day |
| 6:00 AM | 11:30 PM | previous day |
| 7:00 AM | 12:30 AM | same day |
| 8:00 AM | 1:30 AM | same day |
| 9:00 AM | 2:30 AM | same day |
| 12:00 PM | 5:30 AM | same day |
| 3:00 PM | 8:30 AM | same day |
| 5:00 PM | 10:30 AM | same day |
| 6:00 PM | 11:30 AM | same day |
| 9:00 PM | 2:30 PM | same day |
Why people convert ACST to Nairobi time
- Scheduling a call from ACST to Nairobi: a 10:00 AM start in ACST lands at 3:30 AM in Nairobi, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and Nairobi are inside the 9-to-5 working day between 3:30 PM and 5:00 PM ACST time (9:00 AM–10:30 AM EAT). That is roughly 1 hours 30 minutes of usable overlap.
- Booking travel or deliveries: tracking Nairobi local time against ACST keeps pickup windows and arrival estimates honest across the -6h 30m offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -6h 30m gap is not.
- Block 3:30 PM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need Nairobi colleagues present.
About ACST (Australian Central Standard Time)
Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.
About EAT (East Africa Time)
East Africa Time (EAT) is used in the countries of East Africa including Kenya, Ethiopia, Tanzania, Uganda, and others. EAT does not observe daylight saving time and shares the same offset as Moscow Standard Time (MSK).
Best time to call between ACST and Nairobi
Both ACST and Nairobi sit inside the 9 AM – 5 PM working day between 3:30 PM–5:00 PM ACST, which is 9:00 AM–10:30 AM EAT. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and Nairobi overlap for only 90 minutes (3:30 PM–5:00 PM ACST), so meetings have to be booked precisely.
ACST is 6 hours 30 minutes behind Nairobi (ACST UTC+09:30 → EAT UTC+03:00). The shared working window is 3:30 PM–5:00 PM ACST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
Nairobi
Does not observe DST
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 ACST and Nairobi?
ACST (ACST, UTC+09:30) is 6 hours 30 minutes behind Nairobi (EAT, UTC+03:00). The gap is currently -6h 30m.
How do I convert ACST time to Nairobi time?
Add -6h 30m to ACST local time. For example, 9:00 AM in ACST is 2:30 AM in Nairobi.
What time is it in Nairobi right now?
Nairobi uses EAT at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h 30m offset from ACST.
What is the best time to call Nairobi from ACST?
Call between 3:30 PM and 5:00 PM ACST — that maps to 9:00 AM–10:30 AM EAT and keeps both parties inside the working day.
Which is behind, ACST or Nairobi?
ACST is 6 hours 30 minutes behind Nairobi. When it is 12:00 PM in ACST it is 5:30 AM in Nairobi.
Do ACST and Nairobi use different time zones?
ACST uses ACST at UTC+09:30, while Nairobi (Kenya) uses EAT at UTC+03:00. The IANA identifiers are Australia/Adelaide and Africa/Nairobi.
Does daylight saving time affect the ACST–Nairobi difference?
Neither zone observes daylight saving time, so the -6h 30m offset between ACST and Nairobi is fixed all year.
Which other cities share ACST's time zone?
ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.
Which countries use ACST, ACST's zone?
ACST is used in Australia (South Australia, Northern Territory).
Is there a day difference between ACST and Nairobi?
Not normally. The -6h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and Nairobi?
Nairobi is -6h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is Nairobi in?
Nairobi operates on East Africa Time (EAT), UTC+3. As the tech hub of Africa (Silicon Savannah), Nairobi leads African fintech and mobile innovation.
What are the business hours in Nairobi?
Standard business hours in Nairobi are 8:00 AM - 5:00 PM EAT.
Which countries use ACST (Australian Central Standard Time)?
ACST is used in Australia (South Australia, Northern Territory).
Does ACST observe daylight saving time?
Yes, ACST switches to ACDT during summer months.
What are some interesting facts about ACST?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
Which cities are in the EAT timezone?
Major cities in the EAT timezone include Nairobi, Addis Ababa, Dar es Salaam, Kampala, Mogadishu, Antananarivo.
What is the UTC offset for EAT?
East Africa Time (EAT) is at UTC+03:00.
What should I know about the EAT timezone?
Nairobi is a major tech hub in Africa, often called 'Silicon Savannah'. Ethiopia uses its own calendar, which is 7-8 years behind the Gregorian calendar.
When is it midnight in ACST, what time is it in Nairobi?
When it is 12:00 AM (midnight) in ACST (ACST), it is -6h 30m later in Nairobi (EAT).
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