HST to AKDT Converter
Convert time between Hawaii Standard Time (HST) and Alaska Daylight Time (AKDT)
Hawaii Standard Time (HST)
Alaska Daylight Time (AKDT)
Time Difference
Alaska Daylight Time (AKDT) is 0 hours ahead of Hawaii Standard Time (HST)
Select Date
Select Time
Quick Reference
| HST | AKDT |
|---|---|
| 16:00 | 18:00 |
| 18:00 | 20:00 |
| 20:00 | 22:00 |
| 22:00 | 00:00 |
| 00:00 | 02:00 |
| 02:00 | 04:00 |
| 04:00 | 06:00 |
| 06:00 | 08:00 |
| 08:00 | 10:00 |
| 10:00 | 12:00 |
| 12:00 | 14:00 |
| 14:00 | 16:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About HST to AKDT Time Conversion
Converting time between Hawaii Standard Time (HST) and Alaska Daylight Time (AKDT) bridges Honolulu, Hilo, and the rest of Hawaii with Anchorage and Fairbanks. HST is UTC-10 while AKDT is UTC-8, placing AKDT 2 hours ahead of HST.
This converter uses the IANA timezone database for accurate calculations. Hawaii does not observe daylight saving time, so HST is constant year-round. AKDT is in effect from March to November; during the rest of the year Alaska uses AKST (UTC-9), and the offset to HST shrinks to 1 hour.
Common Use Cases for HST to AKDT Conversion
Business & Work
- Scheduling meetings between Hawaii-based teams and Alaska partners
- Coordinating tourism, fishing, and military operations across the Pacific
- Planning conference calls between Honolulu and Anchorage
Personal & Travel
- Planning travel itineraries between Hawaii and Alaska
- Coordinating with family and friends in Alaska from Hawaii
- Scheduling virtual events for HST and AKDT audiences
Time Zone Information
Hawaii Standard Time (HST)
- UTC Offset: UTC-10
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: Hawaii does not observe daylight saving time
- Major Cities: Honolulu, Hilo, Kailua, Pearl City, Kaneohe
- Coverage: Hawaii year-round
Alaska Daylight Time (AKDT)
- UTC Offset: UTC-8
- IANA Timezone: America/Anchorage
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Anchorage, Fairbanks, Juneau, Sitka
- Coverage: Most of Alaska during daylight saving period
Quick Reference: HST to AKDT
Remember: AKDT is 2 hours ahead of HST during Alaska's daylight saving period. After DST ends in November, the offset shrinks to 1 hour (HST to AKST).
Frequently Asked Questions
What is the time difference between HST and AKDT?
Hawaii Standard Time (HST) is UTC-10, while Alaska Daylight Time (AKDT) is UTC-8. AKDT is 2 hours ahead of HST. When it is 12:00 PM in Honolulu, it is 2:00 PM in Anchorage.
When does this HST to AKDT conversion apply?
AKDT runs from the second Sunday in March to the first Sunday in November. Hawaii does not observe DST and stays on HST year-round. The 2-hour offset applies during Alaska's DST window.
How does the time difference change throughout the year?
When Alaska reverts to AKST (UTC-9) in November, the offset to HST shrinks to 1 hour. HST itself never changes because Hawaii does not observe daylight saving.
What are the best times for HST-AKDT business calls?
Most working hours overlap cleanly. 9:00 AM–5:00 PM HST corresponds to 11:00 AM–7:00 PM AKDT — both regions are awake and at work for most of that span.
Which countries/regions use AKDT timezone?
AKDT covers most of Alaska during daylight saving, including Anchorage, Fairbanks, Juneau, and Sitka. The Aleutian Islands use Hawaii-Aleutian Time and follow a different rule set.
Which countries/regions use HST timezone?
HST is observed in Hawaii year-round. Major cities include Honolulu, Hilo, Kailua, Pearl City, and Kaneohe. The western Aleutian Islands also use Hawaii-Aleutian Time.
Pro Tips
- • AKDT is 2 hours ahead of HST — add 2 hours to a Honolulu time to get the Anchorage time.
- • Both regions sit in the Pacific. Most working hours overlap cleanly — easy real-time collaboration.
- • Best meeting window: 9:00 AM–3:00 PM HST overlaps with 11:00 AM–5:00 PM AKDT.
- • Hawaii never observes DST. Only the AKDT side shifts; HST is constant year-round.
- • Use IANA identifiers (Pacific/Honolulu and America/Anchorage) in calendar tools to handle DST transitions automatically.
- • When Alaska reverts to AKST in November, the offset to Hawaii shrinks to 1 hour — even tighter overlap.