HST to EEST Converter
Convert time between Hawaii-Aleutian Standard Time (HST) and Eastern European Summer Time (EEST)
Hawaii-Aleutian Standard Time (HST)
Eastern European Summer Time (EEST)
Time Difference
Eastern European Summer Time (EEST) is 0 hours ahead of Hawaii-Aleutian Standard Time (HST)
Select Date
Select Time
Quick Reference
| HST | EEST |
|---|---|
| 16:00 | 04:00 |
| 18:00 | 06:00 |
| 20:00 | 08:00 |
| 22:00 | 10:00 |
| 00:00 | 12:00 |
| 02:00 | 14:00 |
| 04:00 | 16:00 |
| 06:00 | 18:00 |
| 08:00 | 20:00 |
| 10:00 | 22:00 |
| 12:00 | 00:00 |
| 14:00 | 02:00 |
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 HST to EEST Time Conversion
Converting time between Hawaii-Aleutian Standard Time (HST) and Eastern European Summer Time (EEST) involves a significant 13-hour difference. HST is UTC-10, while EEST is UTC+3, making Eastern Europe 13 hours ahead of Hawaii during summer months.
EEST is the daylight saving time for Eastern Europe, active from late March to late October. Hawaii does not observe daylight saving time, staying at UTC-10 year-round. During winter when Eastern Europe uses EET (UTC+2), the difference reduces to 12 hours.
Common Use Cases for HST to EEST Conversion
Business & Work
- International shipping and logistics during summer months
- Global IT companies with distributed teams across Hawaii and Eastern Europe
- Summer tourism coordination between Hawaii and Eastern European destinations
- Multinational corporations managing summer operations across these regions
Personal & Travel
- Coordinating with family and friends during Eastern European summer
- Planning summer travel between Hawaii and EEST countries
- Scheduling virtual meetings during the 13-hour time difference
- Managing international relationships during daylight saving period
Time Zone Information
Hawaii-Aleutian Standard Time (HST)
- UTC Offset: UTC-10
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: None - Hawaii does not observe daylight saving time
- Major Cities: Honolulu, Hilo, Kailua, Pearl City, Waipahu
- Coverage: Hawaii and the Aleutian Islands of Alaska
Eastern European Summer Time (EEST)
- UTC Offset: UTC+3
- IANA Timezone: Europe/Kiev
- Daylight Saving: Active from late March to late October
- Major Cities: Kyiv, Athens, Bucharest, Sofia, Helsinki, Tallinn, Riga, Vilnius
- Coverage: Eastern Europe during daylight saving time
Quick Reference: HST to EEST
EEST is 13 hours ahead of HST during summer (late March to late October). When EEST ends and EET begins (late October), the difference decreases to 12 hours. Hawaii does not observe daylight saving time.
Frequently Asked Questions
What is the time difference between HST and EEST?
Hawaii-Aleutian Standard Time (HST) is UTC-10, while Eastern European Summer Time (EEST) is UTC+3. This means EEST is 13 hours ahead of HST. When it's 12:00 PM (noon) in Honolulu, it's 1:00 AM the next day in Kyiv or Athens.
When is EEST active?
Eastern European Summer Time (EEST) is the daylight saving time observed from the last Sunday in March to the last Sunday in October. During winter months (late October to late March), Eastern Europe uses EET (UTC+2) instead, making the difference with Hawaii 12 hours instead of 13.
Does Hawaii observe daylight saving time?
No, Hawaii does not observe daylight saving time. HST remains UTC-10 year-round. This means the time difference with Eastern Europe changes seasonally: 13 hours during EEST (summer) and 12 hours during EET (winter).
What are the best times for calls between Hawaii and EEST regions?
With a 13-hour gap, finding overlap is challenging. Early morning in Hawaii (6-8 AM HST) corresponds to evening in EEST (7-9 PM). Late evening in Hawaii (7-9 PM HST) aligns with morning in EEST (8-10 AM next day). These windows offer the best meeting times.
Which countries use EEST?
EEST is used during summer by countries including Ukraine, Greece, Romania, Bulgaria, Finland, Estonia, Latvia, Lithuania, Moldova, and Cyprus. These countries switch to EET (UTC+2) during winter months.
How does the date change work with a 13-hour difference?
Since EEST is 13 hours ahead, any time after 11:00 AM HST means it's already the next calendar day in EEST regions. For example, Monday 2:00 PM in Honolulu is Tuesday 3:00 AM in Athens. Always double-check the date when scheduling.
Pro Tips
- • The 13-hour difference during summer is one of the largest gaps - use asynchronous communication for routine updates.
- • Morning Hawaii (7-8 AM HST) = Evening EEST (8-9 PM) - one of the few windows where both parties are awake during reasonable hours.
- • Remember the difference drops to 12 hours when EEST ends (late October) and Eastern Europe switches to EET.
- • For follow-the-sun workflows, Hawaii can hand off work at end of day to Eastern Europe starting their morning.
- • Always specify both the time AND date when scheduling - HST afternoon is already the next calendar day in EEST.
- • Mark your calendar for the last Sundays of March and October when EEST transitions occur.
Update Logs
View the latest updates and features