EDT to HST Converter
Convert time between Eastern Daylight Time (EDT) and Hawaii Standard Time (HST)
Eastern Daylight Time (EDT)
Hawaii Standard Time (HST)
Time Difference
Hawaii Standard Time (HST) is 0 hours ahead of Eastern Daylight Time (EDT)
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Select Time
Quick Reference
| EDT | HST |
|---|---|
| 21:00 | 16:00 |
| 23:00 | 18:00 |
| 01:00 | 20:00 |
| 03:00 | 22:00 |
| 05:00 | 00:00 |
| 07:00 | 02:00 |
| 09:00 | 04:00 |
| 11:00 | 06:00 |
| 13:00 | 08:00 |
| 15:00 | 10:00 |
| 17:00 | 12:00 |
| 19:00 | 14:00 |
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
Related Time Zone Conversions
About EDT to HST Time Conversion
Converting time between Eastern Daylight Time (EDT) and Hawaii Standard Time (HST) is essential for coordinating between the US East Coast and Hawaii during summer months. EDT is UTC-4 (observed from the second Sunday in March to the first Sunday in November), while HST is UTC-10 year-round. EDT is 6 hours ahead of HST during the summer season.
This conversion is crucial for businesses coordinating between East Coast cities and Hawaii. Whether you're scheduling meetings between New York and Honolulu headquarters, managing distributed teams across the Atlantic and Pacific, or planning travel between mainland and island offices, our accurate IANA-based converter ensures precise timezone calculations. The 6-hour difference during EDT season is substantial and requires careful attention to scheduling to find overlapping business hours between these distant regions.
Common Use Cases for EDT to HST Conversion
Business & Work
- Scheduling East Coast to Hawaii business meetings during summer months
- Coordinating between mainland and Hawaii headquarters during EDT season
- Managing business operations across East Coast and Hawaiian regions
- Planning conference calls between East Coast and Hawaii teams during daylight saving period
Personal & Travel
- Coordinating with family and friends in Hawaii during summer
- Planning travel between East Coast and Hawaiian destinations
- Scheduling virtual events for East Coast-Hawaii audiences during summer
- Arranging online meetings with Hawaii-based colleagues during EDT months
Time Zone Information
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4
- IANA Timezone: America/New_York
- Daylight Saving: Daylight saving time (second Sunday in March to first Sunday in November)
- Major Cities: New York, Boston, Philadelphia, Miami, Washington DC, Atlanta
- Coverage: Eastern United States and Canada (summer months)
Hawaii Standard Time (HST)
- UTC Offset: UTC-10
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: No daylight saving time (consistent year-round)
- Major Cities: Honolulu, Hilo, Kailua, Maui, Kauai
- Coverage: All Hawaiian islands (consistent year-round)
Quick Reference: EDT to HST
Remember: EDT is 6 hours ahead of HST (during summer months, March to November). When daylight saving time ends (first Sunday in November) and EDT becomes EST, the difference decreases to 5 hours. Hawaii does not observe daylight saving time, so HST remains constant year-round.
Frequently Asked Questions
What is the time difference between EDT and HST?
Eastern Daylight Time (EDT) is UTC-4, while Hawaii Standard Time (HST) is UTC-10. EDT is 6 hours ahead of HST. When it's 2:00 PM in New York (EDT), it's 8:00 AM the same day in Honolulu (HST).
When is EDT active and how does it affect Hawaii coordination?
EDT is observed from the second Sunday in March to the first Sunday in November. During this period, the East Coast is 6 hours ahead of Hawaii. From November to March, when the East Coast observes EST (UTC-5), the difference decreases to 5 hours. This makes summer coordination (EDT season) have a larger time gap than winter coordination.
Does Hawaii observe daylight saving time like EDT does?
No, Hawaii does not observe daylight saving time. Hawaii Standard Time (HST) remains UTC-10 year-round. This is why the time difference between Hawaii and the mainland varies - the mainland changes its clocks twice per year while Hawaii stays constant. EDT is specifically the summer offset for the East Coast.
What major cities are in EDT and HST timezones?
EDT covers major East Coast cities including New York, Boston, Philadelphia, Miami, Washington DC, and Atlanta during summer months. HST covers all Hawaiian islands with major cities being Honolulu, Hilo, Kailua, Waihuku, and Kaneohe. These regions represent the US East Coast during daylight saving season and the Hawaiian Islands.
What are the best times to schedule calls between EDT and HST regions?
The 6-hour difference during EDT season provides limited overlap. Early morning EDT times (7-8 AM) correspond to very early morning HST (1-2 AM), and late morning EDT (10 AM-12 PM) corresponds to very early morning HST (4-6 AM). Late afternoon EDT (3-5 PM) aligns well with late morning/midday HST (9-11 AM), making this an ideal window for summer business coordination.
How does summer (EDT) coordination differ from winter (EST) coordination with Hawaii?
During summer (March-November, EDT season), the East Coast is 6 hours ahead of Hawaii, creating a larger time gap for mainland-Hawaii coordination. During winter (November-March, EST season), the difference is only 5 hours, providing better overlap for business hours. Many businesses adjust their summer schedules to account for the larger time difference, while winter offers more flexibility for overlapping work hours.
Pro Tips
- • EDT is always 6 hours ahead of HST during summer months (March-November).
- • When daylight saving time ends (first Sunday in November), EDT becomes EST and the difference decreases to 5 hours.
- • Early morning EDT times (8-10 AM) correspond to early morning HST times (2-4 AM), but late afternoon EDT (3-5 PM) provides better overlap with late morning HST times (9-11 AM).
- • Hawaii does not observe daylight saving time, so HST is consistent year-round while EDT changes once per season.
- • For long-term projects spanning both seasons, account for the time difference change when EDT transitions to EST in November.
- • Late afternoon EDT (3-5 PM) aligns well with late morning/midday HST (9-11 AM), providing excellent overlap for summer business calls and coordination.
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