HST to PST Converter
Convert time between Hawaii Standard Time (HST) and Pacific Standard Time (PST)
Hawaii Standard Time (HST)
Pacific Standard Time (PST)
Time Difference
Pacific Standard Time (PST) is 0 hours ahead of Hawaii Standard Time (HST)
Select Date
Select Time
Quick Reference
| HST | PST |
|---|---|
| 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
Related Time Zone Conversions
About HST to PST Time Conversion
Converting time between Hawaii Standard Time (HST) and Pacific Standard Time (PST) is important for coordinating between Hawaii and the US West Coast. HST is UTC-10, while PST is UTC-8, making PST 2 hours ahead of HST. Hawaii does not observe daylight saving time, but the West Coast does, adding complexity to the conversion.
This conversion is vital for business operations between Hawaii and the mainland US West Coast, including California, Washington, and Oregon. Understanding this time difference is crucial for scheduling meetings, managing customer service, and coordinating operations between these important economic regions.
Common Use Cases for HST to PST Conversion
Business & Work
- Scheduling calls between Hawaii offices and West Coast headquarters
- Coordinating shipping and logistics operations across Pacific regions
- Managing tourism reservations and customer service across Hawaii-West Coast
Personal & Travel
- Scheduling video calls with family and friends in California, Oregon, or Washington
- Planning travel between Hawaii and the West Coast
- Coordinating vacation and leisure time across regions
Time Zone Information
Hawaii Standard Time (HST)
- UTC Offset: UTC-10
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: No daylight saving time observed
- Major Cities: Honolulu, Hilo, Maui, Kauai, Big Island
- Coverage: State of Hawaii
Pacific Standard Time (PST)
- UTC Offset: UTC-8 (UTC-7 during PDT)
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, Seattle, San Diego, Portland, Sacramento
- Coverage: Pacific Coast United States and Canada
Quick Reference: HST to PST
Remember: PST is always 2 hours ahead of HST, but becomes 3 hours during PDT (daylight saving time)
Frequently Asked Questions
What is the time difference between HST and PST?
Hawaii Standard Time (HST) is UTC-10, while Pacific Standard Time (PST) is UTC-8. PST is 2 hours ahead of HST. This means when it's 8:00 AM in HST, it's 10:00 AM the same day in PST.
Does Hawaii observe daylight saving time?
No, Hawaii does not observe daylight saving time. Hawaii Standard Time (HST) remains UTC-10 year-round. However, the West Coast does observe daylight saving time, transitioning from PST (UTC-8) to PDT (UTC-7). 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 HST, it would be 11:00 AM PDT. This is why it's important to verify whether PST or PDT is currently active.
What major cities are in HST and PST timezones?
HST covers Hawaii cities including Honolulu, Hilo, Maui, Kauai, and the Big Island. PST covers major West Coast cities like Los Angeles, San Francisco, Seattle, San Diego, Portland, and Sacramento. These regions represent Hawaii and the Pacific Coast of the continental US.
How do I convert HST to PST manually?
To convert from HST to PST, add 2 hours to the HST time. For example, if it's 9:00 AM HST, it would be 11:00 AM PST the same day. Remember that the difference becomes 3 hours when the West Coast observes PDT (daylight saving time).
What should I know about scheduling across HST and PST?
Hawaii is 2-3 hours behind the West Coast, making scheduling easier than with the East Coast. Early morning PST times (8-10 AM) correspond to early morning HST times (6-8 AM), and late afternoon PST (3-5 PM) corresponds to late morning/early afternoon HST (1-3 PM). These overlaps make Hawaii-West Coast coordination more feasible than Hawaii-East Coast coordination.
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 HST-PST to eliminate AM/PM confusion, especially around morning/evening transitions.
- • Tourism and hospitality businesses between Hawaii and the West Coast can easily coordinate across both regions during shared business hours.