Convert KST to UTC
See the time difference between Korea Standard Time and Coordinated Universal Time, compare hours, and plan meetings accurately.
How KST to UTC Works
Korea Standard Time is UTC+9 and Coordinated Universal Time is UTC+0, so UTC is 9 hours behind KST. Enter any hour to convert it instantly across both time zones.
Hour-by-Hour Conversion Table
Use the visual grid and hour-by-hour table to compare KST and UTC across the day. Export selected times with ICS download or send them to Google Calendar and Gmail.
Schedule Meetings with Confidence
Find overlapping working hours between Korea Standard Time and Coordinated Universal Time for calls and events. Time calculations adjust automatically using the IANA timezone database for accuracy.
KST stands for Korea Standard Time, and UTC stands for Coordinated Universal Time.
How to Convert KST to UTC
Open the KST to UTC converter: Go to https://www.xconvert.com/time-converter/kst-to-utc-converter to load a visual comparison grid with Korea Standard Time and Coordinated Universal Time already set up for side-by-side viewing. This layout is useful when you are planning a call with teams in South Korea or coordinating systems, logs, or deadlines that are recorded in UTC.
Add comparison cities if your schedule involves more than KST and UTC: Click “+ Add City” and search for cities that matter to your workflow, such as Seoul-focused partners using KST alongside UTC-based infrastructure, aviation planning, or international engineering teams. This is especially practical for remote operations, cloud support, and global product teams that need to compare Korean office hours with UTC-based monitoring, release windows, or reporting schedules.
Select the time range on the grid: Click “Select” to enter selection mode, then drag across the KST row to highlight a meeting window in purple; you can move the whole block by dragging the center or fine-tune it with the left and right handles. For example, selecting 9:00 KST shows 0:00 UTC, 12:00 KST shows 3:00 UTC, 15:00 KST shows 6:00 UTC, and 18:00 KST shows 9:00 UTC, which helps confirm whether a Korean business-day slot lands in a practical UTC working period.
Export and share the selected time: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. These options are useful when sending a confirmed handoff window to a distributed engineering team, inviting UTC-based stakeholders to a Seoul-led meeting, or sharing an exact cross-time-zone slot with vendors and clients.
Understanding the KST to UTC Time Difference
UTC is 9 hours behind KST, and KST is 9 hours ahead of UTC. In practical terms, when it is 9:00 KST, it is 0:00 UTC; when it is 12:00 KST, it is 3:00 UTC; when it is 15:00 KST, it is 6:00 UTC; and when it is 18:00 KST, it is 9:00 UTC.
This time difference stays the same throughout the year because KST does not observe DST and UTC does not observe DST. That means there are no months when the KST–UTC difference changes, which is useful for recurring meetings, scheduled deployments, and international reporting cycles that need a stable conversion rule.
KST is used in North Korea and South Korea, so this conversion is especially relevant for companies coordinating with Korean offices, manufacturers, gaming studios, electronics suppliers, and shipping partners while using UTC for technical infrastructure or global scheduling standards. Because the offset remains fixed, teams can standardize recurring communication without seasonal adjustments.
Best Times for Calls and Meetings Between KST and UTC
The most practical meeting windows are usually found by starting with standard business hours in KST and then checking where they land in UTC. Using the fixed examples, 9:00 KST = 0:00 UTC, 12:00 KST = 3:00 UTC, 15:00 KST = 6:00 UTC, and 18:00 KST = 9:00 UTC, so a Korean workday maps to early-morning UTC hours.
For teams that need overlap with a KST-based office, 15:00 KST to 18:00 KST is often one of the most workable ranges because it corresponds to 6:00 UTC to 9:00 UTC. That window can support morning coordination for UTC-based teams while still staying inside normal afternoon business hours in Korea, which is helpful for product reviews, support escalations, and release coordination.
Earlier KST slots are less convenient for many UTC participants. For example, 9:00 KST = 0:00 UTC and 12:00 KST = 3:00 UTC, so a Korean morning meeting may fall at midnight or very early morning in UTC, which is usually better suited to asynchronous updates than live calls.
Because neither time standard uses daylight saving time, recurring meetings remain predictable all year. A weekly sync scheduled at 15:00 KST will continue to appear at 6:00 UTC, and a late-afternoon Korean meeting at 18:00 KST will continue to align with 9:00 UTC without seasonal drift.
Frequently Asked Questions
What is the time difference between KST and UTC?
UTC is 9 hours behind KST, and KST is 9 hours ahead of UTC. This means you convert from KST to UTC by using that fixed 9-hour gap shown in the comparison grid and examples on the page.
This stable difference is especially useful for recurring business processes such as weekly meetings, handoff schedules, and reporting deadlines. Since the offset does not change seasonally, teams can rely on the same conversion throughout the year.
When is 9 AM KST in UTC?
9:00 KST = 0:00 UTC. This means a 9 AM start to the business day in Korea corresponds to midnight in UTC.
That timing matters for global teams because a Korean morning standup may be outside normal live meeting hours for UTC-based participants. In those cases, teams often use recorded updates, written handoffs, or later KST meetings for real-time discussion.
When is 12 PM KST in UTC?
12:00 KST = 3:00 UTC. A noon meeting in Korea therefore lands at 3:00 in UTC.
This is still an early hour for many UTC-based work schedules, so it may be more suitable for operational teams, infrastructure monitoring, or participants who start early. For broader attendance, later KST times are usually easier to manage.
Does the difference between KST and UTC change during DST?
No, the difference does not change during daylight saving time because KST does not observe DST and UTC does not observe DST. There are no seasonal clock changes affecting this pair.
As a result, there are no months when the KST-to-UTC difference shifts. This makes long-term calendar planning simpler for recurring calls, service windows, and cross-border project management.
What is the best meeting time between KST and UTC?
A practical live-meeting window is often in the later part of the Korean workday. Using the examples on this page, 15:00 KST = 6:00 UTC and 18:00 KST = 9:00 UTC, so 15:00–18:00 KST can work well for teams trying to create overlap.
By contrast, earlier Korean business hours map to very early UTC times, such as 9:00 KST = 0:00 UTC and 12:00 KST = 3:00 UTC. For many organizations, that makes afternoon KST meetings more realistic than morning KST meetings when UTC participants need to join live.
How do I convert KST to UTC for a work schedule?
Use the visual grid to compare a KST row directly against the UTC row, then drag across the Korean time block you are considering. This is useful for planning support shifts, release windows, or vendor calls where a Seoul-based schedule needs to be translated into a UTC-based operations calendar.
For example, if your team works with a Korean office in the afternoon, the grid will show that 15:00 KST aligns with 6:00 UTC and 18:00 KST aligns with 9:00 UTC. That makes it easier to identify whether a task should be handled synchronously or passed through an asynchronous handoff.
Is KST always ahead of UTC?
Yes, KST is always 9 hours ahead of UTC. The relationship does not reverse or vary during the year.
This consistency is important for industries that depend on precise timestamps, such as software operations, logistics coordination, and international customer support. Once a team adopts a recurring KST-to-UTC schedule, it can keep using the same conversion without seasonal updates.