Compare KST vs PST
See the current time difference between KST and PST, how DST changes Pacific Time, and the best hours to schedule meetings.
How to Find the Time Difference Between KST and PST
Open the KST vs PST comparison page: Visit https://www.xconvert.com/time-converter/kst-vs-pst to load a visual comparison between Korea Standard Time (KST, UTC+9) and Pacific Time, which appears as Pacific Standard Time (PST, UTC-8) in winter and Pacific Daylight Time (PDT, UTC-7) in summer. This page is useful when you are scheduling a supplier call with Seoul, coordinating a game release between Korea and California, or checking whether a Los Angeles-based teammate will still be online during Korean business hours.
Add relevant comparison cities with the + Add City button: Click “+ Add City” and add cities such as Seoul, Los Angeles, San Francisco, or Vancouver to compare real working windows across East Asia and the U.S. West Coast. These city pairs matter for industries that frequently connect these regions, including semiconductors, gaming, e-commerce, entertainment, and trans-Pacific logistics, where Korean headquarters often work with engineering, media, or operations teams in California.
Use Select mode and drag across the grid to highlight a meeting window: Click “Select” if the page is in scroll mode, then drag across the colored timeline on the KST row to choose a block such as 9:00 AM to 11:00 AM KST. In standard time, that window converts to 4:00 PM to 6:00 PM PST on the previous day, and during U.S. daylight saving time it becomes 5:00 PM to 7:00 PM PDT on the previous day, which immediately shows why a Seoul morning meeting usually lands in California’s late afternoon or early evening the day before.
Resize, review, and export the selected range: Drag the purple selection’s left or right handles to fine-tune the overlap, or drag the center to move the whole block until you find a practical handoff time for both sides. Once selected, use ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link to send the exact cross-time-zone slot to a distributed team, for example when confirming a launch review between a Seoul product team and a Santa Monica marketing group.
KST vs PST Offset Explained
Korea Standard Time is always UTC+9 and does not observe daylight saving time. South Korea keeps the same offset all year, so Seoul, Busan, and Incheon remain fixed at UTC+9 in January, July, and every month in between. That consistency makes KST easy to plan around for manufacturing schedules, regional support shifts, and recurring meetings with Korean offices.
Pacific Time changes seasonally in the United States and Canada. The Pacific zone is UTC-8 during Pacific Standard Time (PST) and UTC-7 during Pacific Daylight Time (PDT). In the U.S., daylight saving time begins on the second Sunday in March and ends on the first Sunday in November; for example, in 2025 it starts on March 9, 2025 and ends on November 2, 2025.
The exact KST vs Pacific difference depends on the season. When the Pacific zone is on PST, KST is 17 hours ahead. When the Pacific zone switches to PDT, KST is 16 hours ahead, so the gap narrows by one hour for roughly eight months of the year.
That difference also changes the calendar date between the two regions. If it is 9:00 AM in Seoul, it is 4:00 PM the previous day in Los Angeles during PST or 5:00 PM the previous day during PDT. If it is 6:00 PM in California, it is already 11:00 AM the next day in Korea during PST or 10:00 AM the next day during PDT, which is why cross-Pacific coordination often involves either Korea mornings or U.S. late afternoons.
This time relationship matters in real business operations. South Korea is a major hub for electronics, automotive manufacturing, shipping, and online gaming, while Pacific Time covers major business centers such as Los Angeles, San Francisco, San Diego, Seattle, and Vancouver, where technology, media, venture capital, and international trade are concentrated. Teams handling semiconductor supply chains, entertainment licensing, cloud operations, or e-commerce fulfillment often use the KST-PST comparison to find the narrow overlap between Korean office hours and West Coast end-of-day availability.
Frequently Asked Questions
What is the time difference between KST and PST right now?
KST is 17 hours ahead of PST when the Pacific zone is on standard time, and 16 hours ahead when the Pacific zone is on daylight saving time as PDT. Because South Korea does not change clocks, the only seasonal shift comes from the U.S. and Canadian Pacific zone moving forward in March and back in November.
Is Seoul always ahead of Los Angeles?
Yes, Seoul is always ahead of Los Angeles throughout the year. The gap is 17 hours during PST and 16 hours during PDT, so a workday in Korea usually lines up with the previous afternoon or evening in California.
Why does KST vs PST sometimes show 16 hours and sometimes 17 hours?
The change happens because South Korea stays on UTC+9 year-round, while the Pacific zone alternates between UTC-8 and UTC-7. From the second Sunday in March to the first Sunday in November, cities like Los Angeles and San Francisco observe daylight saving time, reducing the difference by one hour.
When is the best meeting time between Korea and the U.S. West Coast?
A practical overlap is often 8:00 AM to 10:00 AM KST, which corresponds to 3:00 PM to 5:00 PM PST the previous day or 4:00 PM to 6:00 PM PDT the previous day. This works well for engineering handoffs, vendor updates, and project reviews because it catches Korea at the start of the day and California before the end of business.
Does South Korea use daylight saving time?
No, South Korea does not currently observe daylight saving time. That means KST remains fixed at UTC+9, which simplifies recurring scheduling with Korean teams because only the Pacific side changes seasonally.
How do I convert 9 AM KST to Pacific Time?
9:00 AM KST converts to 4:00 PM PST on the previous day in winter and 5:00 PM PDT on the previous day in summer. The “previous day” part is important for travel planning, release coordination, and support coverage, because a Korean morning often falls in the late afternoon of the prior calendar day on the U.S. West Coast.
Is PST the same as Pacific Time for Los Angeles and San Francisco?
Not always. People often say “PST” casually, but Los Angeles and San Francisco use Pacific Time, which is PST in winter and PDT in summer. If you are booking a call with Korea, checking whether the date falls between March and November can prevent a one-hour scheduling mistake.
What industries commonly need KST and PST conversion?
This conversion is especially common in semiconductors, consumer electronics, gaming, entertainment, logistics, and software development. Korean companies and teams in Seoul frequently coordinate with West Coast partners in California, Washington, and British Columbia for product launches, cloud infrastructure work, media approvals, and trans-Pacific shipping schedules.