Convert HST to EAT
EAT is 13 hours ahead of HST. HST is UTC−10 and EAT is UTC+3.
Right now: HST · EAT
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between HST and EAT. Someone has to take an early or late call — or use asynchronous communication instead.
| HST | EAT | Suitable? |
|---|---|---|
| 9:00 AM | 10:00 PM | outside 9–5 |
| 10:00 AM | 11:00 PM | outside 9–5 |
| 11:00 AM | 12:00 AM (next day) | outside 9–5 |
| 12:00 PM | 1:00 AM (next day) | outside 9–5 |
| 1:00 PM | 2:00 AM (next day) | outside 9–5 |
| 2:00 PM | 3:00 AM (next day) | outside 9–5 |
| 3:00 PM | 4:00 AM (next day) | outside 9–5 |
| 4:00 PM | 5:00 AM (next day) | outside 9–5 |
| 5:00 PM | 6:00 AM (next day) | outside 9–5 |
HST to EAT conversion table
| HST | EAT |
|---|---|
| 12:00 AM | 1:00 PM |
| 1:00 AM | 2:00 PM |
| 2:00 AM | 3:00 PM |
| 3:00 AM | 4:00 PM |
| 4:00 AM | 5:00 PM |
| 5:00 AM | 6:00 PM |
| 6:00 AM | 7:00 PM |
| 7:00 AM | 8:00 PM |
| 8:00 AM | 9:00 PM |
| 9:00 AM | 10:00 PM |
| 10:00 AM | 11:00 PM |
| 11:00 AM | 12:00 AM (next day) |
| 12:00 PM | 1:00 AM (next day) |
| 1:00 PM | 2:00 AM (next day) |
| 2:00 PM | 3:00 AM (next day) |
| 3:00 PM | 4:00 AM (next day) |
| 4:00 PM | 5:00 AM (next day) |
| 5:00 PM | 6:00 AM (next day) |
| 6:00 PM | 7:00 AM (next day) |
| 7:00 PM | 8:00 AM (next day) |
| 8:00 PM | 9:00 AM (next day) |
| 9:00 PM | 10:00 AM (next day) |
| 10:00 PM | 11:00 AM (next day) |
| 11:00 PM | 12:00 PM (next day) |
About HST
Hawaii Standard Time (HST) is UTC−10. It is used in Hawaii, which does not observe daylight saving at all.
Hawaii–Aleutian Standard Time is UTC−10 and Hawaii does not observe daylight saving. That makes it the North American zone whose relationship to everywhere else changes twice a year without it doing anything: Hawaii is two hours behind Los Angeles in winter and three in summer. It is also far enough west that the working day barely overlaps with the US east coast at all.
About EAT
East Africa Time (EAT) is UTC+3. It is used in Kenya, Tanzania, Ethiopia, Uganda and Somalia.
East Africa Time is UTC+3 and fixed. Nairobi, Addis Ababa and Dar es Salaam all keep it. Ethiopia additionally uses a clock that counts from dawn rather than midnight for everyday purposes, six hours off the international one, so a time given locally in Addis may need converting twice rather than once.
Does this gap change with the seasons?
Neither HST nor EAT shifts with the seasons, so this 13-hour difference holds all year. That is unusual enough to be worth relying on: most cross-continental gaps move twice a year.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM HST in EAT?
9:00 AM HST is 10:00 PM EAT.
Is EAT ahead of HST?
EAT is 13 hours ahead of HST.
Which time zone does this use?
HST is UTC−10 and EAT is UTC+3. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.