PST to HST Converter
Convert time between Pacific Standard Time (PST) and Hawaii Standard Time (HST)
Pacific Standard Time (PST)
Hawaii Standard Time (HST)
Time Difference
Hawaii Standard Time (HST) is 0 hours ahead of Pacific Standard Time (PST)
Select Date
Select Time
Quick Reference
| PST | HST |
|---|---|
| 18:00 | 16:00 |
| 20:00 | 18:00 |
| 22:00 | 20:00 |
| 00:00 | 22:00 |
| 02:00 | 00:00 |
| 04:00 | 02:00 |
| 06:00 | 04:00 |
| 08:00 | 06:00 |
| 10:00 | 08:00 |
| 12:00 | 10:00 |
| 14:00 | 12:00 |
| 16:00 | 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 PST to HST Time Conversion
Converting time between Pacific Standard Time (PST) and Hawaii Standard Time (HST) is essential for coordinating between the US West Coast and Hawaii. PST is UTC-8 (standard time, typically November to March), while HST is UTC-10 (year-round, Hawaii does not observe daylight saving time). PST is 2 hours ahead of HST during standard time. When daylight saving time is active on the mainland (March-November), the West Coast observes PDT (UTC-7), making it 3 hours ahead of HST.
This conversion is crucial for businesses operating between California, Oregon, Washington, and Hawaii. Tech companies, tourism operations, government agencies, and enterprises coordinating mainland and island operations rely on accurate time conversions. Hawaii Standard Time is unique as it remains constant throughout the year without daylight saving adjustments. This makes the offset with mainland time zones inconsistent - during winter months (PST) the difference is 2 hours, but during summer months (PDT) the difference is 3 hours, requiring careful attention when scheduling calls and managing operations across both regions.
Common Use Cases for PST to HST Conversion
Business & Work
- Scheduling calls between California headquarters and Hawaii branch offices
- Coordinating business operations between mainland US and Hawaiian locations
- Managing tourist operations and hospitality services across the mainland and islands
- Planning conference calls for tech companies with presence in both regions
Personal & Travel
- Coordinating with family and friends in Hawaii from the mainland
- Planning travel between West Coast and Hawaiian destinations
- Scheduling virtual meetings with Hawaii-based relatives or business partners
- Arranging online collaboration with Hawaii-based colleagues
Time Zone Information
Pacific Standard Time (PST)
- UTC Offset: UTC-8
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Standard time (first Sunday in November to second Sunday in March)
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, San Diego, Sacramento
- Coverage: Pacific United States and Canada (winter 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: PST to HST
Remember: PST is 2 hours ahead of HST (during winter). When daylight saving time begins (second Sunday in March) and PST becomes PDT, the difference increases to 3 hours. Hawaii does not observe daylight saving time.
Frequently Asked Questions
What is the time difference between PST and HST?
Pacific Standard Time (PST) is UTC-8, while Hawaii Standard Time (HST) is UTC-10. PST is 2 hours ahead of HST. When it's 8:00 AM in Los Angeles (PST), it's 6:00 AM the same day in Honolulu (HST).
Does Hawaii observe daylight saving time like PST does?
No, Hawaii does not observe daylight saving time. Hawaii Standard Time (HST) remains UTC-10 year-round. However, the mainland West Coast observes daylight saving time, transitioning from PST (UTC-8) to PDT (UTC-7, March to November). This means the time difference varies between 2 hours (when PST is active) and 3 hours (when PDT is active).
What is the time difference during Pacific Daylight Time (PDT)?
When the West Coast observes Pacific Daylight Time (PDT, UTC-7) from mid-March to early November, the difference becomes 3 hours. During this period, when it's 8:00 AM PDT, it would be 5:00 AM HST. This is why it's crucial to verify whether PST or PDT is currently active when scheduling calls.
What major cities are in PST and HST timezones?
PST covers major West Coast cities including Los Angeles, San Francisco, Seattle, San Diego, Portland, and Sacramento. HST covers all Hawaiian islands with major cities being Honolulu, Hilo, Kailua, Waihuku, and Kaneohe. These regions represent the US Pacific Coast and the Hawaiian Islands.
What are the best times to schedule calls between PST and HST regions?
Business hour overlap is moderate due to the 2-3 hour difference. Morning hours in PST (8-10 AM) correspond to early morning in HST (6-8 AM), and late morning PST (10 AM-12 PM) corresponds to morning HST (8-10 AM). Afternoon PST (3-5 PM) aligns well with late morning/midday HST (1-3 PM), making this an ideal window for business coordination.
Why do businesses coordinate between the mainland West Coast and Hawaii?
Hawaii is a strategic business hub for tourism, tech, government, and military operations. Many companies have headquarters on the mainland (California, Washington) with significant operations in Hawaii. The 2-3 hour time difference is much more manageable than with the East Coast, and the substantial daily overlap (unlike East Coast-Hawaii coordination) makes real-time collaboration feasible for critical operations.
Pro Tips
- • PST is always 2 hours ahead of HST - but becomes 3 hours when PDT is active (March-November).
- • Hawaii does not observe daylight saving time, so HST is consistent year-round while PST/PDT changes twice annually.
- • Morning hours (8-10 AM PST = 6-8 AM HST) work well for Hawaii-West Coast coordination during business hours.
- • Unlike Hawaii-East Coast coordination, Hawaii and the West Coast have significant daily overlap, making real-time communication feasible.
- • Use 24-hour time format when communicating across PST-HST to eliminate AM/PM confusion, especially around early morning/evening transitions.
- • Tourism, hospitality, and tech businesses between Hawaii and the West Coast can easily coordinate across both regions during shared business hours.
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