HST to SAST
+12hHST
HSTSOURCESAST
SASTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and SAST on the World Map
The map below highlights the HST (Hawaii Standard Time) and SAST (South Africa Standard 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).
SAST – South Africa Standard Time
UTC+02:00South Africa Standard Time (SAST) is the time zone for South Africa and neighboring countries, 2 hours ahead of UTC.
- •South Africa does not observe daylight saving time.
- •SAST is the same offset as EET and Israel Standard Time.
- •The Johannesburg Stock Exchange (JSE) is Africa's largest.
Time Conversion Guide: HST to SAST
HST runs on Hawaii Standard Time (HST) at UTC-10:00. SAST runs on South Africa Standard Time (SAST) at UTC+02:00. That puts HST 12 hours ahead of SAST — a difference of +12h at the current offsets.
In practice, when it is 9:00 AM in HST it is 9:00 PM in SAST. Midnight in HST is 12:00 PM in SAST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to SAST time conversion table
| HST (HST) | SAST (SAST) | Day |
|---|---|---|
| 12:00 AM | 12:00 PM | same day |
| 6:00 AM | 6:00 PM | same day |
| 7:00 AM | 7:00 PM | same day |
| 8:00 AM | 8:00 PM | same day |
| 9:00 AM | 9:00 PM | same day |
| 12:00 PM | 12:00 AM | next day |
| 3:00 PM | 3:00 AM | next day |
| 5:00 PM | 5:00 AM | next day |
| 6:00 PM | 6:00 AM | next day |
| 9:00 PM | 9:00 AM | next day |
Why people convert HST to SAST time
- Scheduling a call from HST to SAST: a 10:00 AM start in HST lands at 10:00 PM in SAST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +12h gap: HST and SAST 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 SAST is 9:00 PM in HST.
- Watching a live event or market open: HST viewers need 9:00 PM in SAST to catch a 9:00 AM start there, and 12:00 PM if the event is anchored to HST.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" 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 HST takes the early slot, the next week SAST 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 SAST (South Africa Standard Time)
South Africa Standard Time (SAST) is used in South Africa, Lesotho, and Eswatini. SAST does not observe daylight saving time. Johannesburg and Cape Town are major economic hubs in Africa.
Best time to call between HST and SAST
With a +12h offset there is no overlap inside a normal 9 AM – 5 PM day. SAST opens at 9:00 AM SAST, which is 9:00 PM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and SAST have no shared working hours because of the +12h gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 12 hours ahead of SAST (HST UTC-10:00 → SAST UTC+02:00). 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 SAST?
HST (HST, UTC-10:00) is 12 hours ahead of SAST (SAST, UTC+02:00). The gap is currently +12h.
How do I convert HST time to SAST time?
Add +12h to HST local time. For example, 9:00 AM in HST is 9:00 PM in SAST.
What time is it in SAST right now?
SAST uses SAST at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +12h offset from HST.
What is the best time to call SAST from HST?
There is no shared working-hours window because of the +12h gap. The closest option is 1:00 PM in HST, which is 1:00 AM in SAST.
Which is ahead, HST or SAST?
HST is 12 hours ahead of SAST. When it is 12:00 PM in HST it is 12:00 AM in SAST.
Does daylight saving time affect the HST–SAST difference?
Neither zone observes daylight saving time, so the +12h offset between HST and SAST 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 SAST?
Sometimes. The +12h gap is large enough that 8:00 PM or later in HST already falls on the next day in SAST.
What is the time difference between HST and SAST?
SAST is +12h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is SAST in?
SAST 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 SAST timezone?
Major cities in the SAST timezone include Johannesburg, Cape Town, Durban, Pretoria, Port Elizabeth.
What is the UTC offset for SAST?
South Africa Standard Time (SAST) is at UTC+02:00.
What should I know about the SAST timezone?
South Africa does not observe daylight saving time. SAST is the same offset as EET and Israel Standard Time.
When is it midnight in HST, what time is it in SAST?
When it is 12:00 AM (midnight) in HST (HST), it is +12h later in SAST (SAST).
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See every conversion from HST →·See every conversion from SAST →