Convert HST to SAST

SAST is 12 hours ahead of HST. HST is UTC−10 and SAST is UTC+2.

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Standard 9–5 working hours do not overlap at all between HST and SAST. Someone has to take an early or late call — or use asynchronous communication instead.

HST to SAST conversion table

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 SAST

South Africa Standard Time (SAST) is UTC+2. It is used in South Africa, Lesotho and Eswatini.

South Africa Standard Time is UTC+2 with no daylight saving, unchanged since 1903 apart from two wartime years. The whole country keeps it, and so do Lesotho and Eswatini. Against the UK it is two hours ahead in winter and one in summer, which is the shift that catches London–Johannesburg standing calls every March and October.

Does this gap change with the seasons?

Neither HST nor SAST shifts with the seasons, so this 12-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

Other HST conversions

• HST to UTC
• HST to GMT
• HST to EST
• HST to EDT
• HST to CST
• HST to CDT
• HST to MST
• HST to MDT
• HST to PST
• HST to PDT
• HST to AKST
• HST to BRT
• HST to BST
• HST to CET
• HST to CEST
• HST to EET

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