PDT to JST Converter
Convert time between Pacific Daylight Time (PDT) and Japan Standard Time (JST)
Pacific Daylight Time (PDT)
Japan Standard Time (JST)
Time Difference
Japan Standard Time (JST) is 0 hours ahead of Pacific Daylight Time (PDT)
Select Date
Select Time
Quick Reference
| PDT | JST |
|---|---|
| 18:00 | 11:00 |
| 20:00 | 13:00 |
| 22:00 | 15:00 |
| 00:00 | 17:00 |
| 02:00 | 19:00 |
| 04:00 | 21:00 |
| 06:00 | 23:00 |
| 08:00 | 01:00 |
| 10:00 | 03:00 |
| 12:00 | 05:00 |
| 14:00 | 07:00 |
| 16:00 | 09:00 |
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
About PDT to JST Time Conversion
Converting time between Pacific Daylight Time (PDT) and Japan Standard Time (JST) is essential for US West Coast to Japan coordination. PDT is UTC-7 while JST is UTC+9, making JST 16 hours ahead of PDT. The US West Coast observes daylight saving time, transitioning from PDT (UTC-7) to PST (UTC-8). Japan does not observe daylight saving time, so JST remains constant at UTC+9 year-round. This means the actual difference varies between 16 hours (when PDT is active) and 17 hours (when PST is active).
This conversion is crucial for business operations between the US West Coast and Japan. Whether you're scheduling international meetings, coordinating between San Francisco and Tokyo, managing customer service operations, or coordinating with business partners across both regions, our accurate IANA-based converter ensures precise timezone calculations accounting for seasonal daylight saving changes.
Common Use Cases for PDT to JST Conversion
Business & Work
- Scheduling US West Coast to Japan business meetings
- Coordinating San Francisco and Tokyo corporate operations
- Managing global business operations between West Coast USA and Japan
Personal & Travel
- Planning travel from US West Coast to Japan
- Coordinating with Japanese family and friends from US West Coast
- Scheduling virtual events for West Coast USA-Japan audiences
Time Zone Information
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, San Diego
- Coverage: US West Coast and Pacific region
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: None - JST is standard time year-round
- Major Cities: Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka
- Coverage: All of Japan
Quick Reference: PDT to JST
Remember: JST is always 16 hours ahead of PDT, but becomes 17 hours when PST is active (daylight saving time)
Frequently Asked Questions
What is the time difference between PDT and JST?
Pacific Daylight Time (PDT) is UTC-7, while Japan Standard Time (JST) is UTC+9. JST is always 16 hours ahead of PDT. This means when it's 12:00 AM (midnight) PDT, it's 4:00 PM JST on the same day.
What is PDT and when is it used?
PDT (Pacific Daylight Time) is the daylight saving time zone used on the US West Coast from mid-March to early November. During winter months (November to March), the US West Coast uses PST (Pacific Standard Time, UTC-8). PDT covers cities like Los Angeles, San Francisco, Seattle, and Portland.
Does the PDT to JST conversion change seasonally?
Yes, the PDT to JST conversion changes seasonally because PDT transitions to PST. Japan does not observe daylight saving time, so JST remains UTC+9 year-round. When the US West Coast switches to PST (UTC-8), the time difference becomes 17 hours instead of 16 hours.
What major cities are in PDT and JST timezones?
PDT covers West Coast US cities including Los Angeles, San Francisco, Seattle, Portland, San Diego, Oakland, and Sacramento. JST covers all of Japan including Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka, and Kobe.
How do I convert PDT to JST manually?
To convert from PDT to JST, add 16 hours to the PDT time. For example, if it's 3:00 PM (15:00) PDT, add 16 hours to get 7:00 AM (07:00) JST the next day. When PST is active (November-March), add 17 hours instead.
What should I know about scheduling across PDT and JST?
When coordinating between PDT and JST, remember that JST is 16 hours ahead. Late afternoon PDT (4-6 PM) equals morning JST (8-10 AM next day), offering good overlap for real-time communication. Early morning PDT (9-11 AM) equals evening JST (1-3 AM next day), making those times less suitable for business.
Pro Tips
- • JST is always 16 hours ahead of PDT, but becomes 17 hours when PST is active (November to March).
- • Japan does not observe daylight saving time, so JST is consistent while PDT/PST changes twice annually.
- • Late afternoon PDT (4-6 PM) equals morning JST (8-10 AM next day), providing excellent overlap for calls and collaboration.
- • Early morning PDT (9-11 AM) equals late night JST (1-3 AM), making those times less ideal for business coordination.
- • When the US transitions between PDT and PST, the time difference changes from 16 to 17 hours; always verify which is currently active.
- • Use the converter during timezone transitions (March and November) to ensure accurate scheduling across PDT and JST regions.