CAT to HST
-12hCAT
CATSOURCEHST
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
CAT and HST on the World Map
The map below highlights the CAT (Central Africa Time) and HST (Hawaii Standard 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.
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).
Everything You Need to Know About CAT and HST Time
CAT runs on Central Africa Time (CAT) at UTC+02:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts CAT 12 hours behind HST — a difference of -12h at the current offsets.
In practice, when it is 9:00 AM in CAT it is 9:00 PM in HST on the previous day. Midnight in CAT is 12:00 PM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
CAT to HST time conversion table
| CAT (CAT) | HST (HST) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | previous day |
| 6:00 AM | 6:00 PM | previous day |
| 7:00 AM | 7:00 PM | previous day |
| 8:00 AM | 8:00 PM | previous day |
| 9:00 AM | 9:00 PM | previous day |
| 12:00 PM | 12:00 AM | same day |
| 3:00 PM | 3:00 AM | same day |
| 5:00 PM | 5:00 AM | same day |
| 6:00 PM | 6:00 AM | same day |
| 9:00 PM | 9:00 AM | same day |
Why people convert CAT to HST time
- Scheduling a call from CAT to HST: a 10:00 AM start in CAT lands at 10:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -12h gap: CAT and HST 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 HST is 9:00 PM in CAT.
- Coordinating a CAT-based team with HST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM CAT" is unambiguous; "3 PM" across a -12h gap is not.
- With a -12h gap there is no shared 9-to-5 window, so alternate the early start: one week CAT takes the early slot, the next week HST does.
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 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.
Best time to call between CAT and HST
With a -12h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 9:00 PM in CAT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
CAT and HST have no shared working hours because of the -12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
CAT is 12 hours behind HST (CAT UTC+02:00 → HST UTC-10:00). 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 CAT and HST?
CAT (CAT, UTC+02:00) is 12 hours behind HST (HST, UTC-10:00). The gap is currently -12h.
How do I convert CAT time to HST time?
Add -12h to CAT local time. For example, 9:00 AM in CAT is 9:00 PM in HST (previous day).
What time is it in HST right now?
HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -12h offset from CAT.
What is the best time to call HST from CAT?
There is no shared working-hours window because of the -12h gap. The closest option is 1:00 PM in CAT, which is 1:00 AM in HST.
Which is behind, CAT or HST?
CAT is 12 hours behind HST. When it is 12:00 PM in CAT it is 12:00 AM in HST.
Does daylight saving time affect the CAT–HST difference?
Neither zone observes daylight saving time, so the -12h offset between CAT and HST is fixed all year.
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 HST?
Sometimes. The -12h gap is large enough that 8:00 PM or later in CAT already falls on the in HST.
What is the time difference between CAT and HST?
HST is -12h from CAT.
What timezone is CAT in?
CAT operates on its local timezone.
What timezone is HST in?
HST operates on its local timezone.
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 HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in CAT, what time is it in HST?
When it is 12:00 AM (midnight) in CAT (CAT), it is -12h later in HST (HST).
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