PDT to KST Converter
Convert time between Pacific Daylight Time (PDT) and Korea Standard Time (KST)
Pacific Daylight Time (PDT)
Korea Standard Time (KST)
Time Difference
Korea Standard Time (KST) is 0 hours ahead of Pacific Daylight Time (PDT)
Select Date
Select Time
Quick Reference
| PDT | 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 PDT to KST Time Conversion
Converting time between Pacific Daylight Time (PDT) and Korea Standard Time (KST) involves a 16-hour difference. PDT is UTC-7, while KST is UTC+9, making KST 16 hours ahead of PDT during US daylight saving months. This is one of the widest gaps between major business regions, so live overlap between the US West Coast and South Korea is extremely limited and most coordination happens through asynchronous handoffs.
This time zone converter uses the IANA timezone database for accurate calculations. PDT applies on the US West Coast from the second Sunday in March to the first Sunday in November, while KST is observed year-round across the Korean peninsula with no daylight saving time. During US winter the West Coast reverts to PST (UTC-8), increasing the gap to 17 hours.
Common Use Cases for PDT to KST Conversion
Business & Work
- Scheduling Los Angeles, San Francisco, or Seattle calls with Seoul partners during US summer
- Coordinating semiconductor, tech, gaming, and entertainment projects between the US West Coast and South Korea
- Planning early-morning PDT calls to catch end-of-day KST business hours
Personal & Travel
- Planning travel between the US West Coast and South Korea during summer
- Coordinating with family or friends in Seoul, Busan, or Incheon from California, Oregon, or Washington
- Scheduling video calls with study groups or K-pop fan communities across the 16-hour gap
Time Zone Information
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7 (during daylight saving time)
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, San Diego, Seattle, Portland, Las Vegas
- Coverage: US Pacific region during daylight saving time (summer months)
Korea Standard Time (KST)
- UTC Offset: UTC+9 (no daylight saving time)
- IANA Timezone: Asia/Seoul
- Daylight Saving: None — KST is observed year-round
- Major Cities: Seoul, Busan, Incheon, Daegu, Daejeon
- Coverage: South Korea (and historically North Korea)
Quick Reference: PDT to KST
Remember: KST is always 16 hours ahead of PDT (17 hours ahead when the West Coast is on PST in winter)
Frequently Asked Questions
What is the time difference between PDT and KST?
Pacific Daylight Time (PDT) is UTC-7, while Korea Standard Time (KST) is UTC+9. KST is 16 hours ahead of PDT. When it's 9:00 AM in Los Angeles (PDT), it's 1:00 AM the next day in Seoul (KST).
When does the PDT to KST conversion apply?
PDT is observed on the US West Coast from the second Sunday in March to the first Sunday in November. Outside this period, the West Coast uses PST (UTC-8), increasing the gap to 17 hours ahead of KST. KST stays fixed year-round.
How does the time difference change throughout the year?
During US summer (March–November), the gap is 16 hours (PDT vs KST). During US winter (November–March), the West Coast reverts to PST (UTC-8) and the gap becomes 17 hours. South Korea never observes daylight saving time.
What are the best times for PDT-KST business calls?
With a 16-hour gap, live overlap is extremely limited. The most workable window is 4:00–6:00 PM PDT (8:00–10:00 AM KST next day), catching the West Coast end-of-day as Seoul starts the morning. Asynchronous handoffs work better for everyday collaboration.
Which countries use Korea Standard Time (KST)?
KST (UTC+9) is used year-round by South Korea (and historically North Korea, though Pyongyang Time exists separately). Major cities include Seoul, Busan, Incheon, Daegu, and Daejeon. KST never observes daylight saving time.
Which regions use Pacific Daylight Time (PDT)?
PDT (UTC-7) is observed during summer months by the US Pacific time zone, including California, Oregon, Washington, and Nevada. Major cities include Los Angeles, San Francisco, San Diego, Seattle, and Portland. Hawaii and most of Arizona do not use PDT.
Pro Tips
- • KST is 16 hours ahead of PDT — add 16 hours and roll one calendar day forward to convert from West Coast summer time.
- • In US winter (PST), the gap grows to 17 hours — confirm whether PDT or PST is active before scheduling.
- • Best meeting window: 4–6 PM PDT (8–10 AM KST next day) is the only practical live overlap.
- • South Korea never observes DST — KST stays fixed at UTC+9, so only the West Coast side shifts.
- • Korean business hours (9 AM–6 PM KST) are 5 PM–2 AM PDT — most coordination is asynchronous.
- • Tech, gaming, and entertainment partnerships between LA/SF and Seoul typically rely on early-morning Pacific calls or late-evening Korean calls.