HST to ART Converter & Meeting Planner
Quick answer: 9:00 AM HST = 4:00 PM ART (fixed -10:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Hawaii-Aleutian Standard Time (HST) and Argentina Time (ART)? You need to account for the standard time difference. Argentina Time is normally 7 hours ahead of Hawaii-Aleutian Standard Time. Whether you are coordinating between teams in Honolulu and Hilo and Buenos Aires and Córdoba, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM HST = 7:00 AM ART. The full 24-hour HST to ART table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM HST = 10:00 PM ART.
| HST Time | ART Time |
|---|---|
| 12:00 AM (00:00) | 7:00 AM (07:00) |
| 1:00 AM (01:00) | 8:00 AM (08:00) |
| 2:00 AM (02:00) | 9:00 AM (09:00) |
| 3:00 AM (03:00) | 10:00 AM (10:00) |
| 4:00 AM (04:00) | 11:00 AM (11:00) |
| 5:00 AM (05:00) | 12:00 PM (12:00) |
| 6:00 AM (06:00) | 1:00 PM (13:00) |
| 7:00 AM (07:00) | 2:00 PM (14:00) |
| 8:00 AM (08:00) | 3:00 PM (15:00) |
| 9:00 AM (09:00) | 4:00 PM (16:00) |
| 10:00 AM (10:00) | 5:00 PM (17:00) |
| 11:00 AM (11:00) | 6:00 PM (18:00) |
| 12:00 PM (12:00) | 7:00 PM (19:00) |
| 1:00 PM (13:00) | 8:00 PM (20:00) |
| 2:00 PM (14:00) | 9:00 PM (21:00) |
| 3:00 PM (15:00) | 10:00 PM (22:00) |
| 4:00 PM (16:00) | 11:00 PM (23:00) |
| 5:00 PM (17:00) | 12:00 AM (00:00)+1 day |
| 6:00 PM (18:00) | 1:00 AM (01:00)+1 day |
| 7:00 PM (19:00) | 2:00 AM (02:00)+1 day |
| 8:00 PM (20:00) | 3:00 AM (03:00)+1 day |
| 9:00 PM (21:00) | 4:00 AM (04:00)+1 day |
| 10:00 PM (22:00) | 5:00 AM (05:00)+1 day |
| 11:00 PM (23:00) | 6:00 AM (06:00)+1 day |
Best time to call Buenos Aires from Honolulu
For most work calls, compare the normal business day in Honolulu (HST) with the business day in Buenos Aires (ART). HST commonly covers Pacific Ocean, North America, while ART is mainly associated with South America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 11:00 AM HST, which corresponds to 4:00 PM - 6:00 PM ART. This window sits inside the typical HST workday (9:00 AM - 5:00 PM) and the ART workday (9:00 AM - 6:00 PM).
- DST Safety: HST or ART may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Buenos Aires Stock Exchange (BCBA): 11:00-17:00 local time in Buenos Aires.
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Frequently Asked Questions
What is the time difference between HST and ART?
During standard time, Argentina Time is 7 hours ahead of Hawaii-Aleutian Standard Time.
Does Hawaii observe Daylight Saving Time?
Hawaii does not observe Daylight Saving Time and has not done so since 1947, remaining fixed at UTC-10:00 year-round. At roughly 20° North latitude, Hawaii's daylight hours vary by only about 1.5 hours between the summer and winter solstices — far too little to justify the disruption of a seasonal clock change.
Why is it called Hawaii-Aleutian time?
The name combines two geographically distant US territories that share the same UTC-10:00 standard offset: the Hawaiian Islands in the central Pacific and the westernmost Aleutian Islands of Alaska, which extend past the 180° meridian into the Eastern Hemisphere. Despite sharing a base offset, they behave differently — Hawaii observes no DST, while the Aleutian communities such as Adak do advance to HDT (UTC-9) each summer.
Does Argentina observe Daylight Saving Time?
Argentina permanently abolished Daylight Saving Time in 2009 after years of inconsistent observance. Since then, ART has remained fixed at UTC-03:00 every day of the year, with no seasonal clock changes of any kind.
Are Argentina Time (ART) and Brasilia Time (BRT) the same?
ART and BRT are distinct, separately designated time zones, but they currently share the exact same UTC-03:00 offset. Because neither Argentina nor Brazil's southeastern states currently observe DST, the two zones remain perfectly aligned year-round — though that alignment could change if either country's DST policy shifts.