JST to PST Converter
Convert time between Japan Standard Time (JST) and Pacific Standard Time (PST)
Japan Standard Time (JST)
Pacific Standard Time (PST)
Time Difference
Pacific Standard Time (PST) is 0 hours ahead of Japan Standard Time (JST)
Select Date
Select Time
Quick Reference
| JST | PST |
|---|---|
| 11:00 | 18:00 |
| 13:00 | 20:00 |
| 15:00 | 22:00 |
| 17:00 | 00:00 |
| 19:00 | 02:00 |
| 21:00 | 04:00 |
| 23:00 | 06:00 |
| 01:00 | 08:00 |
| 03:00 | 10:00 |
| 05:00 | 12:00 |
| 07:00 | 14:00 |
| 09:00 | 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 JST to PST Time Conversion
Converting time between Japan Standard Time (JST) and Pacific Standard Time (PST) is essential for Japan to US West Coast coordination. JST is UTC+9 while PST is UTC-8, making JST 17 hours ahead of PST. Japan does not observe daylight saving time, so JST remains constant year-round. However, the US West Coast observes daylight saving time, transitioning from PST (UTC-8) to PDT (UTC-7). This means the actual difference varies between 17 hours (when PST is active) and 16 hours (when PDT is active).
This conversion is crucial for business operations between Japan and Silicon Valley or other West Coast tech hubs. Whether you're scheduling international meetings, coordinating product launches, or managing global teams, our accurate IANA-based converter ensures precise timezone calculations accounting for seasonal daylight saving changes on the West Coast.
Common Use Cases for JST to PST Conversion
Business & Work
- Scheduling Japan to US West Coast business meetings
- Coordinating Tokyo and Silicon Valley tech operations
- Managing global business operations between Japan and West Coast USA
Personal & Travel
- Planning travel from Japan to US West Coast
- Coordinating with West Coast family and friends from Japan
- Scheduling virtual events for Japan-West Coast USA audiences
Time Zone Information
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: None - JST remains constant year-round
- Major Cities: Tokyo, Osaka, Kyoto, Yokohama, Nagoya
- Coverage: All of Japan
Pacific Standard Time (PST)
- UTC Offset: UTC-8
- IANA Timezone: America/Los_Angeles
- Daylight Saving: First Sunday in November to Second Sunday in March
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, San Diego
- Coverage: Pacific Coast of United States and Canada
Quick Reference: JST to PST
Remember: JST is always 17 hours ahead of PST, but becomes 16 hours when PDT is active (daylight saving time)
Frequently Asked Questions
What is the time difference between JST and PST?
Japan Standard Time (JST) is UTC+9, while Pacific Standard Time (PST) is UTC-8. JST is 17 hours ahead of PST. This means when it's 8:00 AM in JST, it's 3:00 PM the previous day in PST.
Does Japan observe daylight saving time?
No, Japan does not observe daylight saving time. Japan Standard Time (JST) remains UTC+9 year-round. However, the US West Coast observes daylight saving time, transitioning from PST (UTC-8) to PDT (UTC-7). This means the time difference varies between 17 hours (when PST is active) and 16 hours (when PDT is active).
What is the time difference during Pacific Daylight Time (PDT)?
When the US West Coast observes Pacific Daylight Time (PDT, UTC-7) from mid-March to early November, the difference becomes 16 hours. During this period, when it's 8:00 AM JST, it would be 4:00 PM PDT the previous day. This is why it's important to verify whether PST or PDT is currently active.
What major cities are in JST and PST timezones?
JST covers major Japanese cities including Tokyo, Osaka, Kyoto, Yokohama, and Nagoya, as well as all cities throughout Japan. PST covers major West Coast US cities like Los Angeles, San Francisco, Seattle, Portland, and San Diego.
How do I convert JST to PST manually?
To convert from JST to PST, subtract 17 hours from the JST time. For example, if it's 9:00 AM JST, it would be 4:00 PM PST the previous day. Remember that the difference becomes 16 hours when the US West Coast observes PDT (daylight saving time).
What should I know about scheduling across JST and PST?
Japan is 16-17 hours ahead of the US West Coast, with very limited overlap. Morning JST times (8-10 AM) correspond to evening PST times (3-5 PM previous day), while afternoon JST (2-4 PM) corresponds to late morning PST (9-11 AM previous day). Scheduling requires careful coordination to find mutually acceptable times for both regions.
Pro Tips
- • JST is always 17 hours ahead of PST - but becomes 16 hours when PDT is active (March-November).
- • Japan does not observe daylight saving time, so JST is consistent year-round while PST/PDT changes twice annually.
- • Morning JST (8-10 AM) equals evening PST (3-5 PM previous day), making same-day coordination challenging.
- • For Silicon Valley business coordination, afternoon JST (2-4 PM = 9-11 AM PST previous day) provides early morning options.
- • Use 24-hour time format when communicating across JST-PST to eliminate AM/PM confusion across day boundaries.
- • Between March and November, remember the 16-hour difference when PST transitions to PDT due to daylight saving time.