HST to EAT
+13hHST
HSTSOURCEEAT
EATGreen rows indicate typical business hours (9 AM - 5 PM)
HST and EAT on the World Map
The map below highlights the HST (Hawaii Standard Time) and EAT (East Africa Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
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).
HST to EAT Time Difference – Complete Guide
HST runs on Hawaii Standard Time (HST) at UTC-10:00. EAT runs on East Africa Time (EAT) at UTC+03:00. That puts HST 13 hours ahead of EAT — a difference of +13h at the current offsets.
In practice, when it is 9:00 AM in HST it is 10:00 PM in EAT. Midnight in HST is 1:00 PM in EAT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to EAT time conversion table
| HST (HST) | EAT (EAT) | Day |
|---|---|---|
| 12:00 AM | 1:00 PM | same day |
| 6:00 AM | 7:00 PM | same day |
| 7:00 AM | 8:00 PM | same day |
| 8:00 AM | 9:00 PM | same day |
| 9:00 AM | 10:00 PM | same day |
| 12:00 PM | 1:00 AM | next day |
| 3:00 PM | 4:00 AM | next day |
| 5:00 PM | 6:00 AM | next day |
| 6:00 PM | 7:00 AM | next day |
| 9:00 PM | 10:00 AM | next day |
Why people convert HST to EAT time
- Scheduling a call from HST to EAT: a 10:00 AM start in HST lands at 11:00 PM in EAT, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +13h gap: HST and EAT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in EAT is 10:00 PM in HST.
- Keeping family and friends in sync: knowing that 8:00 PM in HST is 9:00 AM in EAT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" is unambiguous; "3 PM" across a +13h gap is not.
- With a +13h gap there is no shared 9-to-5 window, so alternate the early start: one week HST takes the early slot, the next week EAT does.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
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 HST and EAT
With a +13h offset there is no overlap inside a normal 9 AM – 5 PM day. EAT opens at 9:00 AM EAT, which is 10:00 PM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and EAT have no shared working hours because of the +13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 13 hours ahead of EAT (HST UTC-10:00 → EAT UTC+03:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
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 HST and EAT?
HST (HST, UTC-10:00) is 13 hours ahead of EAT (EAT, UTC+03:00). The gap is currently +13h.
How do I convert HST time to EAT time?
Add +13h to HST local time. For example, 9:00 AM in HST is 10:00 PM in EAT.
What time is it in EAT right now?
EAT 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 +13h offset from HST.
What is the best time to call EAT from HST?
There is no shared working-hours window because of the +13h gap. The closest option is 1:00 PM in HST, which is 2:00 AM in EAT.
Which is ahead, HST or EAT?
HST is 13 hours ahead of EAT. When it is 12:00 PM in HST it is 1:00 AM in EAT.
Does daylight saving time affect the HST–EAT difference?
Neither zone observes daylight saving time, so the +13h offset between HST and EAT is fixed all year.
Which other cities share HST's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, HST's zone?
HST is used in United States (Hawaii).
Is there a day difference between HST and EAT?
Sometimes. The +13h gap is large enough that 8:00 PM or later in HST already falls on the next day in EAT.
What is the time difference between HST and EAT?
EAT is +13h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is EAT in?
EAT operates on its local timezone.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting facts about HST?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
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 HST, what time is it in EAT?
When it is 12:00 AM (midnight) in HST (HST), it is +13h later in EAT (EAT).
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See every conversion from HST →·See every conversion from EAT →