ART to HST Time Converter
HST is 7 hours behind ART. ART is UTC-3:00, and HST is UTC-10:00.
Best Time to Call Between ART and HST
Both zones are inside normal business hours between 4:00 PM and 5:00 PM ART — that's 9:00 AM to 10:00 AM HST. That's a 1-hour window.
both at work ART only HST only neither — hours along the strip are ART.
Common Times Converted
ART on the left, HST on the right.
ART to HST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| ART | HST | Working hours |
|---|---|---|
| 12:00 AM | 5:00 PM prev day | — |
| 1:00 AM | 6:00 PM prev day | — |
| 2:00 AM | 7:00 PM prev day | — |
| 3:00 AM | 8:00 PM prev day | — |
| 4:00 AM | 9:00 PM prev day | — |
| 5:00 AM | 10:00 PM prev day | — |
| 6:00 AM | 11:00 PM prev day | — |
| 7:00 AM | 12:00 AM | — |
| 8:00 AM | 1:00 AM | — |
| 9:00 AM | 2:00 AM | ART only |
| 10:00 AM | 3:00 AM | ART only |
| 11:00 AM | 4:00 AM | ART only |
| 12:00 PM | 5:00 AM | ART only |
| 1:00 PM | 6:00 AM | ART only |
| 2:00 PM | 7:00 AM | ART only |
| 3:00 PM | 8:00 AM | ART only |
| 4:00 PM | 9:00 AM | Both zones |
| 5:00 PM | 10:00 AM | HST only |
| 6:00 PM | 11:00 AM | HST only |
| 7:00 PM | 12:00 PM | HST only |
| 8:00 PM | 1:00 PM | HST only |
| 9:00 PM | 2:00 PM | HST only |
| 10:00 PM | 3:00 PM | HST only |
| 11:00 PM | 4:00 PM | HST only |
What ART and HST Actually Are
ART — Argentina Time
Buenos Aires, Córdoba, Rosario. Standing at UTC-3:00 as written, and the region does not change its clocks, so that offset holds all year. Argentina does not observe daylight saving, so this offset is fixed year-round.
Argentina has changed its time zone rules more than a dozen times since 1930 and abandoned daylight saving in 2009.
HST — Hawaii Standard Time
Honolulu and the rest of Hawaii. Standing at UTC-10:00 as written, and the region does not change its clocks, so that offset holds all year. Hawaii does not observe daylight saving, so this offset holds all year.
Hawaii dropped daylight saving in 1967 and never resumed it. Being close to the equator, its daylight barely varies across the year, so there is little to gain.
What This Means in Practice
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Major Cities in Each Zone
Cities on ART
Cities on HST
Frequently Asked Questions
What is the time difference between ART and HST?
HST is 7 hours behind ART.
What is 9:00 AM ART in HST?
9:00 AM ART is 2:00 AM HST.
What are the best hours to schedule a call between ART and HST?
Between 4:00 PM and 5:00 PM ART, which is 9:00 AM to 10:00 AM HST. Both sides are inside normal business hours through that window.
Does the difference between ART and HST change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does ART always mean Argentina Time?
Argentina does not observe daylight saving, so this offset is fixed year-round.
Does HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.