Hagåtña to Seoul Time
ChST to KST Converter — 9 AM ChST is 8:00 AM KST
Hagåtña is 1 hour ahead of Seoul. Convert any time between Hagåtña (ChST) and Seoul (KST) instantly.
Hagåtña
Guam
Seoul
South Korea
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Time Zone Comparison
Hagåtña to Seoul Time Conversion Table
| Hagåtña (ChST) | Seoul (KST) |
|---|---|
| 12:00 AM | 11:00 PM |
| 2:00 AM | 1:00 AM |
| 4:00 AM | 3:00 AM |
| 6:00 AM | 5:00 AM |
| 8:00 AM | 7:00 AM |
| 10:00 AM | 9:00 AM |
| 12:00 PM | 11:00 AM |
| 2:00 PM | 1:00 PM |
| 4:00 PM | 3:00 PM |
| 6:00 PM | 5:00 PM |
| 8:00 PM | 7:00 PM |
| 10:00 PM | 9:00 PM |
Hagåtña & Seoul — Business & Scheduling Guide
Hagåtña (Guam) is a US territory and strategic Pacific military base, with key industries in US military, tourism, construction, and fishing. Seoul is a global tech and cultural powerhouse, known for Samsung, LG, K-pop, e-sports, semiconductors, and 5G leadership. With a 1-hour time difference, professionals frequently schedule cross-border calls between these two cities for international trade, remote team collaboration, and client meetings.
Scheduling Meetings Between Hagåtña and Seoul
With only a 1-hour gap, Hagåtña and Seoul have generous overlapping work hours. Morning calls in the earlier time zone align well with mid-day in the other. Guam business hours are typically 8 AM–5 PM, with a US-style business environment. South Korean work culture is fast-paced with typical hours of 9 AM–6 PM, though recent reforms have reduced maximum weekly hours. Most teams find that late morning to early afternoon offers the widest window for collaboration.
Daylight Saving Time Considerations
Neither Hagåtña nor Seoul observes Daylight Saving Time — Hagåtña stays on ChST and Seoul stays on KST year-round. This makes scheduling between these two cities simpler, as the 1-hour time difference remains constant throughout the year with no DST surprises.
Collaboration Tools & Workflow
Teams working between Hagåtña and Seoul enjoy strong real-time collaboration potential. With just a 1-hour time difference, daily standups, pair programming, and spontaneous video calls are all practical. Popular tools for Hagåtña–Seoul teams include Slack for real-time messaging, Google Meet or Zoom for video calls, and Notion or Linear for project management. The overlapping work window is wide enough that most teams can operate nearly synchronously.
Remote Work Between Hagåtña & Seoul
Hagåtña, a key city in Guam, and Seoul, Samsung, are well-connected for remote work. With a manageable 1-hour time difference, distributed teams can maintain a near-synchronous workflow. Both cities have strong internet infrastructure, coworking spaces, and established remote work cultures. For freelancers and remote workers, this time zone pairing is ideal — you can serve clients in Seoul from Hagåtña (or vice versa) without disrupting your standard workday.
ChST to KST — Quick Reference
ChST (ChST) stands for the timezone used in Hagåtña, Guam (UTC+10). KST (KST) is the timezone used in Seoul, South Korea (UTC+9). Hagåtña is 1 hour ahead of Seoul.
To convert ChST to KST, subtract 1 hours from ChST time. For example, ChST 9:00 AM = KST 8:00 AM.
Key Facts
- •Time difference: Hagåtña (UTC+10) is 1 hour ahead of Seoul (UTC+9).
- •Daylight Saving Time: Hagåtña does not observe DST (ChST). Seoul does not observe DST (KST).
- •Regions: Hagåtña is located in Guam and uses the ChST time zone. Seoul is located in South Korea and uses the KST time zone.
- •Best time to call: The best time to call between Hagåtña and Seoul is 10:00 AM to 4:00 PM in Hagåtña time, when both cities have overlapping standard working hours.
Frequently Asked Questions
What is the time difference between Hagåtña and Seoul?
Hagåtña is 1 hour ahead of Seoul.
What time is it in Seoul when it's 9 AM in Hagåtña?
When it's 9:00 AM in Hagåtña, it is 8:00 AM in Seoul.
What time is 9 PM ChST in KST?
9 PM ChST (Hagåtña time) is 8:00 PM KST (Seoul time). This is a common time people check when scheduling evening calls across these two time zones.
When is the best time to schedule a meeting between Hagåtña and Seoul?
The best time to schedule a meeting is between 10:00 AM to 4:00 PM in Hagåtña time, when both cities are within standard working hours (9 AM – 5 PM). This gives you the maximum overlap window for real-time collaboration.
How do I convert ChST to KST?
ChST (ChST) is the timezone for Hagåtña, Guam (UTC+10). KST (KST) is the timezone for Seoul, South Korea (UTC+9). Hagåtña is 1 hour ahead of Seoul. Quick examples: 9 AM ChST = 8:00 AM KST, 12 PM ChST = 11:00 AM KST, 3 PM ChST = 2:00 PM KST, 6 PM ChST = 5:00 PM KST.
Is Hagåtña ahead of or behind Seoul?
Hagåtña is 1 hour ahead of Seoul. When it's noon in Hagåtña, it's 11:00 AM in Seoul.
Does Hagåtña or Seoul change clocks for Daylight Saving Time?
No, Hagåtña does not observe DST — it stays on ChST year-round. Seoul does not observe DST — it stays on KST year-round.
What time is noon in Hagåtña in Seoul time?
When it is 12:00 PM (noon) in Hagåtña (ChST), it is 11:00 AM in Seoul (KST). This is often a popular time for scheduling lunch-hour calls across the Hagåtña–Seoul corridor.
What are the overlapping work hours between Hagåtña and Seoul?
The overlapping work hours between Hagåtña and Seoul are approximately 10:00 AM to 4:00 PM in Hagåtña time, when both cities are within the standard 9 AM–5 PM workday. This is the ideal window for meetings, pair programming, and real-time collaboration.
What timezone is Hagåtña in?
Hagåtña is in the ChST time zone (UTC+10). It is located in Guam. Hagåtña does not observe Daylight Saving Time.
What timezone is Seoul in?
Seoul is in the KST time zone (UTC+9). It is located in South Korea. Seoul does not observe Daylight Saving Time.
How do I schedule a call between Hagåtña and Seoul?
To schedule a call between Hagåtña and Seoul, aim for the overlapping window of 10:00 AM to 4:00 PM in Hagåtña time. Use Google Calendar or Calendly with both time zones visible, share the meeting invite with the KST time clearly noted, and always double-check the time difference — especially during DST transitions. Pro tip: include both local times in the calendar invite title (e.g., "Sync — 10 AM ChST / 9:00 AM KST").
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