KST to PDT Converter
Convert time between Korea Standard Time (KST) and Pacific Daylight Time (PDT)
Korea Standard Time (KST)
Pacific Daylight Time (PDT)
Time Difference
Pacific Daylight Time (PDT) is 0 hours ahead of Korea Standard Time (KST)
Select Date
Select Time
Quick Reference
| KST | PDT |
|---|---|
| 11:00 | 19:00 |
| 13:00 | 21:00 |
| 15:00 | 23:00 |
| 17:00 | 01:00 |
| 19:00 | 03:00 |
| 21:00 | 05:00 |
| 23:00 | 07:00 |
| 01:00 | 09:00 |
| 03:00 | 11:00 |
| 05:00 | 13:00 |
| 07:00 | 15:00 |
| 09:00 | 17:00 |
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 KST to PDT Time Conversion
Converting time from Korea Standard Time (KST) to Pacific Daylight Time (PDT) is essential for South Korea-US West Coast coordination during US daylight saving time. KST is UTC+9, while PDT is UTC-7, making KST 16 hours ahead of PDT. South Korea does not observe DST.
PDT applies from the second Sunday in March to the first Sunday in November. Outside that window, the US Pacific region uses PST (UTC-8), and the gap from KST grows to 17 hours. This converter uses the IANA timezone database (America/Los_Angeles) to apply the correct offset automatically based on the date you pick.
Common Use Cases for KST to PDT Conversion
Business & Work
- Scheduling calls between Korean teams and San Francisco, Los Angeles, or Seattle offices
- Coordinating tech projects between South Korea and Silicon Valley during DST
- Planning end-of-day handoffs from Seoul into the start of a US West Coast workday
Personal & Travel
- Keeping in touch with family or friends on the US West Coast
- Planning travel from South Korea to San Francisco, Los Angeles, or Seattle
- Scheduling virtual events that span Asia and the US
Time Zone Information
Korea Standard Time (KST)
- UTC Offset: UTC+9 (no DST observed)
- IANA Timezone: Asia/Seoul
- Daylight Saving: South Korea does not observe daylight saving time
- Major Cities: Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, Jeju
- Coverage: All of South Korea
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7 (PST UTC-8 outside DST)
- 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, Las Vegas, Vancouver
- Coverage: US Pacific time zone and western Canada (British Columbia, Yukon)
Quick Reference: KST to PDT
Remember: PDT is 16 hours behind KST during US DST; outside that window the US West Coast uses PST and the gap grows to 17 hours
Frequently Asked Questions
What is the time difference between KST and PDT?
Korea Standard Time (KST) is UTC+9, while Pacific Daylight Time (PDT) is UTC-7. KST is 16 hours ahead of PDT, so when it is 12:00 PM Monday in Seoul, it is 8:00 PM Sunday in San Francisco.
When does PDT apply versus PST?
PDT runs from the second Sunday in March to the first Sunday in November. Outside that window, the US Pacific region uses PST (UTC-8), which is 17 hours behind KST. Korea does not observe DST.
Is the date always different between Korea and the US West Coast?
Often. With KST 16 hours ahead of PDT, mornings in Korea fall on the previous day in San Francisco or Los Angeles. Late evenings in Korea are pre-dawn the same day on the US West Coast.
What are the best times to schedule KST to PDT business calls?
Live overlap is narrow. A workable bridge is early-morning Korea (8–10 AM KST), which is 4–6 PM PDT the previous day — end-of-day for the US side. Asynchronous handoffs are often more practical for long-running collaboration.
Which regions and cities use PDT?
PDT (UTC-7) covers the US Pacific time zone during DST. Major cities include Los Angeles, San Francisco, Seattle, Portland, San Diego, Las Vegas, and Vancouver. Western Canada (British Columbia, Yukon) also uses PDT.
Which regions use KST?
KST (UTC+9) is used by all of South Korea. Major cities include Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, and Jeju. South Korea does not observe daylight saving time.
Pro Tips
- • PDT is 16 hours behind KST — subtract 16 hours from Korean time, and roll the date back if needed.
- • PDT applies only during US DST (mid-March to early November); use PST and a 17-hour gap the rest of the year.
- • Korea never observes DST, so all seasonal change is on the US side.
- • For live calls, early-morning Korea (8–10 AM KST) lines up with late-afternoon US West Coast (4–6 PM PDT) the previous day.
- • For recurring meetings, fix the US local time and let KST shift automatically with PDT/PST transitions.
- • Korean tech firms work closely with Silicon Valley partners; this 16-hour gap means handoffs follow the sun across the Pacific.