Convert KST to PST
See the 17-hour time difference between Korea Standard Time and Pacific Standard Time, compare hours, and plan meetings fast.
How to Convert KST to PST
Open the KST to PST converter: Visit https://www.xconvert.com/time-converter/kst-to-pst-converter, where the page is pre-loaded to compare Korea Standard Time and Pacific Time for the U.S. West Coast. This is useful when you are scheduling a product meeting between Seoul and San Francisco, confirming a customer support handoff to Los Angeles, or checking whether a Korean evening call lands during California business hours.
Add comparison cities relevant to your schedule: Click + Add City and add cities such as Seoul, Los Angeles, and San Francisco; you can also add Vancouver or Seattle if your team works across North American Pacific offices. This is especially practical for gaming, semiconductor, e-commerce, and software teams, since South Korean companies often coordinate with West Coast partners in tech, media, and manufacturing supply chains.
Drag across the grid to select a meeting window: Click Select if needed, then drag across the colored timeline on the KST row to highlight a time range in purple; you can resize it with the left and right handles or move it by dragging the center. For example, if you drag 9:00 AM to 11:00 AM KST, the tool will show that as 4:00 PM to 6:00 PM PST on the previous day during standard time, which immediately tells you that a Seoul morning meeting usually means a late-afternoon California meeting the day before.
Export and share the selected time: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link to send the exact converted time to colleagues. This is helpful for distributed teams because an ICS file or Google Calendar link will place the meeting in each participant’s local time automatically, reducing mistakes around overnight scheduling between Korea and the U.S. West Coast.
Understanding the KST to PST Time Difference
Korea Standard Time is UTC+9 all year, and South Korea does not observe daylight saving time. Pacific Standard Time is UTC-8, so KST is 17 hours ahead of PST. That means when it is 9:00 AM in Seoul, it is 4:00 PM in Pacific Standard Time on the previous day in places such as Los Angeles, San Francisco, and Seattle.
The time difference changes when Pacific Time switches to daylight saving time. During the U.S. daylight saving period, the West Coast uses PDT (UTC-7) instead of PST, so KST becomes 16 hours ahead of Pacific Daylight Time rather than 17 hours ahead. In the United States, daylight saving time begins on the second Sunday in March and ends on the first Sunday in November, so the KST-Pacific difference changes for roughly March through early November each year.
For practical scheduling, this means you must check whether your U.S. contact is actually on PST or PDT before confirming a meeting. If a Korean company is coordinating with a California office in January, the gap is 17 hours; if the same team schedules a call in July, the gap is 16 hours because California is then observing daylight saving time.
This date shift matters just as much as the hour difference. Because Korea is so far ahead, many KST-to-PST conversions fall on the previous calendar day in North America; for example, 10:00 PM KST Tuesday = 5:00 AM PST Tuesday, but 9:00 AM KST Tuesday = 4:00 PM PST Monday. That previous-day effect is critical for remote engineering teams, cross-border logistics planning, and customer support coverage.
Best Times for Calls and Meetings Between KST and PST
The biggest challenge between KST and PST is that normal office hours do not overlap naturally. A standard Korean workday of 9:00 AM to 6:00 PM KST corresponds to 4:00 PM to 1:00 AM PST on the previous day, which means only the late afternoon in California overlaps with the following morning in Korea.
One of the most practical windows is 9:00 AM to 11:00 AM KST = 4:00 PM to 6:00 PM PST (previous day) during standard time. This works well for teams where Seoul starts early and California can stay online slightly later, such as software releases, semiconductor operations, gaming live-ops, or e-commerce platform coordination between Korea and the U.S. West Coast.
Another workable option is 8:00 AM to 10:00 AM PST = 1:00 AM to 3:00 AM KST the next day, but this is usually only suitable for urgent incidents rather than routine meetings. It may be used for production outages, security escalations, or launch-night support when a West Coast team needs immediate input from a Korea-based engineering or operations group.
For recurring meetings, the least disruptive compromise is often to place the meeting at 10:00 AM KST = 5:00 PM PST (previous day) in winter, or 10:00 AM KST = 6:00 PM PDT (previous day) during U.S. daylight saving time. This timing avoids very late nights in Seoul while still allowing California participants to join near the end of their workday.
If both teams want to stay within something close to business hours, alternating schedules is often more realistic than forcing one fixed slot year-round. For example, a weekly sync could rotate between a Seoul-friendly morning slot and a California-friendly morning slot, which is common for multinational companies with product, design, and vendor management teams split between East Asia and the U.S. West Coast.
Frequently Asked Questions
What is the time difference between KST and PST?
KST is 17 hours ahead of PST because Korea Standard Time is UTC+9 and Pacific Standard Time is UTC-8. This means if it is 12:00 PM noon in Seoul, it is 7:00 PM PST on the previous day in Los Angeles or San Francisco.
When is 9 AM KST in PST?
9:00 AM KST = 4:00 PM PST on the previous day. The previous-day shift is important, because a Monday morning meeting in Seoul actually lands on Sunday afternoon or evening in Pacific time depending on whether you are comparing against PST or PDT.
Does the difference between KST and PST change during daylight saving time?
Yes, the difference changes when the U.S. West Coast moves from PST to PDT. South Korea stays on UTC+9 all year, but Pacific Time changes from UTC-8 in standard time to UTC-7 in daylight time, so the gap becomes 16 hours instead of 17 between the second Sunday in March and the first Sunday in November.
What is the best meeting time between KST and PST?
A common meeting window is 9:00 AM to 11:00 AM KST, which equals 4:00 PM to 6:00 PM PST on the previous day during standard time. This is often the most sustainable option for regular business calls because it keeps the Korean side in the morning and the California side in late afternoon rather than forcing overnight attendance.
Why does KST to PST often show the previous day?
Korea is so far ahead of Pacific Standard Time that converting from Seoul to California often crosses midnight backward. For example, 8:00 AM Tuesday in KST converts to 3:00 PM Monday in PST, so anyone booking travel, interviews, or release windows needs to verify both the time and the date.
Is KST the same as Seoul time?
Yes, Seoul uses Korea Standard Time (KST), which is UTC+9 year-round. South Korea does not currently observe daylight saving time, so the time in Seoul remains stable throughout the year, making it easier to plan around fixed Korean business hours.
How can I schedule a call between Seoul and Los Angeles without making a mistake?
Use the visual grid on the converter page to compare the two rows directly and drag a meeting block instead of calculating manually. That approach helps you see not only the converted hour but also whether the call falls on the previous day in California, which is one of the most common errors in KST-to-PST scheduling.
Is PST used all year in California?
No, California uses PST only during standard time, typically from early November to mid-March. For the rest of the year, California uses Pacific Daylight Time (PDT), so if you are scheduling with a company in Los Angeles, San Diego, or San Francisco, you should confirm whether the date falls in the daylight saving period before relying on a 17-hour difference.