PST to KST Converter
Convert time between Pacific Standard Time (PST) and Korea Standard Time (KST)
Pacific Standard Time (PST)
Korea Standard Time (KST)
Time Difference
Korea Standard Time (KST) is 0 hours ahead of Pacific Standard Time (PST)
Select Date
Select Time
Quick Reference
| PST | KST |
|---|---|
| 19:00 | 11:00 |
| 21:00 | 13:00 |
| 23:00 | 15:00 |
| 01:00 | 17:00 |
| 03:00 | 19:00 |
| 05:00 | 21:00 |
| 07:00 | 23:00 |
| 09:00 | 01:00 |
| 11:00 | 03:00 |
| 13:00 | 05:00 |
| 15:00 | 07:00 |
| 17:00 | 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 PST to KST Time Conversion
Converting time from Pacific Standard Time (PST) to Korea Standard Time (KST) is essential for US West Coast to South Korea coordination. PST is UTC-8 while KST is UTC+9, making KST 17 hours ahead of PST. The US Pacific region observes daylight saving time, transitioning from PST (UTC-8) to PDT (UTC-7), which means the actual difference varies between 17 hours (when PST is active) and 16 hours (when PDT is active). South Korea does not observe daylight saving time, so KST remains constant at UTC+9 year-round.
This conversion is crucial for business operations between the US West Coast and South Korea. Whether you're scheduling international meetings, coordinating between Los Angeles or San Francisco and Seoul, managing technology partnerships with Korean firms, or working with Korean entertainment and gaming companies, our accurate IANA-based converter ensures precise timezone calculations.
Common Use Cases for PST to KST Conversion
Business & Work
- Scheduling US West Coast to South Korea business meetings
- Coordinating Los Angeles and Seoul corporate operations
- Managing global business operations between Pacific USA and Korea
Personal & Travel
- Planning travel from US West Coast to South Korea
- Coordinating with Korean family and friends from West Coast
- Scheduling virtual events for Pacific USA-Korea audiences
Time Zone Information
Pacific Standard Time (PST)
- UTC Offset: UTC-8 (UTC-7 during PDT)
- 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, Las Vegas, Vancouver
- Coverage: Western United States and Canada
Korea Standard Time (KST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Seoul
- Daylight Saving: None - KST remains constant year-round
- Major Cities: Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, Suwon
- Coverage: All of South Korea
Quick Reference: PST to KST
Remember: KST 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 PST and KST?
Pacific Standard Time (PST) is UTC-8, while Korea Standard Time (KST) is UTC+9. KST is 17 hours ahead of PST. When it's 12:00 PM (noon) PST in Los Angeles, it's 5:00 AM KST the next day in Seoul.
When does this PST to KST conversion apply?
PST (UTC-8) is used on the US West Coast from early November to mid-March. From mid-March to early November, the region switches to PDT (UTC-7), which reduces the KST gap from 17 hours to 16 hours. Korea does not observe daylight saving time, so KST stays at UTC+9 year-round.
How does the time difference change throughout the year?
The PST-KST gap is 17 hours during the winter when PST is active. When the US West Coast switches to PDT in mid-March, the gap narrows to 16 hours. KST itself never changes, so all seasonal variation is driven by US daylight saving time transitions.
What are the best times for PST-KST business calls?
The 17-hour gap is significant but workable. Late afternoon PST (4-6 PM) corresponds to morning KST (9-11 AM next day) - the best window for real-time meetings, since Koreans are starting their workday and West Coast US is finishing theirs. Avoid PST mornings, which translate to late evening KST.
Which countries/regions use KST timezone?
Korea Standard Time (KST) covers all of South Korea, including Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, and Suwon. North Korea also uses UTC+9 (called Pyongyang Time since 2018).
Which countries/regions use PST timezone?
Pacific Standard Time (PST) is used on the US West Coast, including Los Angeles, San Francisco, Seattle, Portland, San Diego, and Las Vegas. It also covers western Canada (Vancouver) and parts of Mexico (Baja California). The PST/PDT region is a major hub for technology, entertainment, and Pacific trade.
Pro Tips
- • KST is 17 hours ahead of PST — 9 AM Tuesday in Los Angeles equals 2 AM Wednesday in Seoul.
- • Korea does not observe daylight saving time, so KST is always UTC+9.
- • When the US West Coast switches to PDT in March, the gap narrows to 16 hours until November.
- • Best window for PST-KST calls: 4-6 PM PST equals 9-11 AM next day KST — perfect overlap.
- • Tech and entertainment partnerships are common between Silicon Valley/Hollywood and Seoul/Busan.
- • Use date qualifiers (today/tomorrow) and 24-hour format when communicating between US West Coast and Korea.