KST to EDT Converter
Convert time between Korea Standard Time (KST) and Eastern Daylight Time (EDT)
Korea Standard Time (KST)
Eastern Daylight Time (EDT)
Time Difference
Eastern Daylight Time (EDT) is 0 hours ahead of Korea Standard Time (KST)
Select Date
Select Time
Quick Reference
| KST | EDT |
|---|---|
| 11:00 | 22:00 |
| 13:00 | 00:00 |
| 15:00 | 02:00 |
| 17:00 | 04:00 |
| 19:00 | 06:00 |
| 21:00 | 08:00 |
| 23:00 | 10:00 |
| 01:00 | 12:00 |
| 03:00 | 14:00 |
| 05:00 | 16:00 |
| 07:00 | 18:00 |
| 09:00 | 20:00 |
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 EDT Time Conversion
Converting time from Korea Standard Time (KST) to Eastern Daylight Time (EDT) is essential for South Korea-US East Coast coordination during US daylight saving time. KST is UTC+9, while EDT is UTC-4, making KST 13 hours ahead of EDT. South Korea does not observe DST.
EDT applies from the second Sunday in March to the first Sunday in November. Outside that window, the US Eastern region uses EST (UTC-5), and the gap from KST grows to 14 hours. This converter uses the IANA timezone database (America/New_York) to apply the correct offset automatically based on the date you pick.
Common Use Cases for KST to EDT Conversion
Business & Work
- Scheduling calls between Korean teams and New York, Boston, or Toronto offices
- Coordinating tech, finance, or media projects between South Korea and the US East Coast
- Planning end-of-day handoffs from Seoul into the start of an East Coast workday
Personal & Travel
- Keeping in touch with family or friends on the US East Coast
- Planning travel from South Korea to New York, Boston, or Washington DC
- 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
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4 (EST UTC-5 outside DST)
- IANA Timezone: America/New_York
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: New York, Boston, Washington DC, Atlanta, Miami, Toronto, Montreal
- Coverage: US Eastern time zone, eastern Canada (Ontario, Quebec)
Quick Reference: KST to EDT
Remember: EDT is 13 hours behind KST during US DST; outside that window the US Eastern region uses EST and the gap grows to 14 hours
Frequently Asked Questions
What is the time difference between KST and EDT?
Korea Standard Time (KST) is UTC+9, while Eastern Daylight Time (EDT) is UTC-4. KST is 13 hours ahead of EDT, so when it is 12:00 PM Monday in Seoul, it is 11:00 PM Sunday in New York.
When does EDT apply versus EST?
EDT runs from the second Sunday in March to the first Sunday in November. Outside that window, the US Eastern region uses EST (UTC-5), which is 14 hours behind KST. Korea does not observe DST.
Is the date always different between Korea and the US East Coast?
Often. With KST 13 hours ahead of EDT, mornings in Korea fall on the previous day in New York or Boston. Late evenings in Korea are pre-dawn the same day on the East Coast.
What are the best times to schedule KST to EDT business calls?
Live overlap is narrow. A workable bridge is early-morning Korea (8–10 AM KST), which is 7–9 PM EDT 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 EDT?
EDT (UTC-4) covers the US Eastern time zone during DST. Major cities include New York, Boston, Washington DC, Atlanta, Miami, Toronto, and Montreal. Eastern Canada (Ontario, Quebec) also uses EDT.
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
- • EDT is 13 hours behind KST — subtract 13 hours from Korean time, and roll the date back if needed.
- • EDT applies only during US DST (mid-March to early November); use EST and a 14-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 end-of-day US East Coast (7–9 PM EDT) the previous day.
- • For recurring meetings, fix the US local time and let KST shift automatically with EDT/EST transitions.
- • Direct flights between Korea and the US East Coast take roughly 14 hours; build in rest before key meetings.