EDT to KST Converter
Convert time between Eastern Daylight Time (EDT) and Korea Standard Time (KST)
Eastern Daylight Time (EDT)
Korea Standard Time (KST)
Time Difference
Korea Standard Time (KST) is 0 hours ahead of Eastern Daylight Time (EDT)
Select Date
Select Time
Quick Reference
| EDT | KST |
|---|---|
| 22:00 | 11:00 |
| 00:00 | 13:00 |
| 02:00 | 15:00 |
| 04:00 | 17:00 |
| 06:00 | 19:00 |
| 08:00 | 21:00 |
| 10:00 | 23:00 |
| 12:00 | 01:00 |
| 14:00 | 03:00 |
| 16:00 | 05:00 |
| 18:00 | 07:00 |
| 20:00 | 09:00 |
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 EDT to KST Time Conversion
Converting time between Eastern Daylight Time (EDT) and Korea Standard Time (KST) connects New York, Boston, Washington, Atlanta, Toronto and Miami with Seoul, Busan, Incheon and Daegu during the US East Coast summer. EDT is UTC-4 while KST is UTC+9, placing KST 13 hours ahead of EDT. South Korea does not observe daylight saving, so KST stays at UTC+9 year-round.
This converter uses the IANA timezone database to handle daylight saving transitions automatically. EDT is observed on the US East Coast from mid-March to early November. Outside that window the East Coast uses EST (UTC-5), widening the offset to KST to 14 hours.
Common Use Cases for EDT to KST Conversion
Business & Work
- Scheduling handoffs between New York or Boston teams and Seoul corporate partners during US summer
- Coordinating manufacturing, automotive and electronics handoffs between the US East Coast and South Korea
- Planning async work cycles between US East Coast HQs and Korean delivery teams
Personal & Travel
- Planning travel itineraries between the US East Coast and South Korea
- Coordinating with family and friends in Seoul, Busan, Incheon or Daegu from New York or Toronto
- Scheduling virtual events, online classes and gaming sessions for EDT and KST audiences
Time Zone Information
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4
- IANA Timezone: America/New_York
- Daylight Saving: Mid-March to early November (US East Coast and Eastern Canada)
- Major Cities: New York, Washington, Boston, Atlanta, Toronto, Miami, Philadelphia
- Coverage: US East Coast and most of Eastern Canada during summer
Korea Standard Time (KST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Seoul
- Daylight Saving: None - KST is observed year-round
- Major Cities: Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju
- Coverage: All of South Korea
Quick Reference: EDT to KST
Remember: KST is always 13 hours ahead of EDT during US summer
Frequently Asked Questions
What is the time difference between EDT and KST?
Eastern Daylight Time (EDT) is UTC-4, while Korea Standard Time (KST) is UTC+9. KST is 13 hours ahead of EDT. When it is 6:00 PM in New York, it is 7:00 AM the next day in Seoul.
When does this EDT to KST conversion apply?
EDT is observed on the US East Coast and Eastern Canada from mid-March to early November. Outside that window the East Coast uses EST (UTC-5), widening the offset to KST to 14 hours.
How does the time difference change throughout the year?
KST is constant at UTC+9. The variation is entirely on the US side: EDT (UTC-4) gives a 13-hour gap, EST (UTC-5) gives a 14-hour gap. The transition happens twice a year — mid-March and early November.
What are the best times for EDT-KST business calls?
The 13-hour gap means evening EDT corresponds to morning next-day KST. 6:00 PM–9:00 PM EDT equals 7:00 AM–10:00 AM next-day KST — a workable handoff for an end-of-day New York call to a Seoul morning. Same-day live business-hours overlap is essentially impossible.
Which countries/regions use KST timezone?
KST is used across all of South Korea. Major cities include Seoul, Busan, Incheon, Daegu, Daejeon, and Gwangju. South Korea does not observe daylight saving, so KST is the same year-round.
Which countries/regions use EDT timezone?
EDT is observed in the US East Coast and most of Eastern Canada during summer. Major cities include New York, Washington, Boston, Atlanta, Toronto, Miami, and Philadelphia.
Pro Tips
- • KST is 13 hours ahead of EDT — add 13 hours (most results land on the next day) to a New York time to get the Seoul time.
- • Korea has no daylight saving. The 13-hour offset only applies during EDT (mid-March–early November); in EST it widens to 14 hours.
- • Best handoff window: 6:00 PM–9:00 PM EDT equals 7:00 AM–10:00 AM next-day KST — end-of-day New York hands off to morning Seoul.
- • Live same-day business-hours meetings are essentially impossible due to the 13-hour gap; design async workflows or recorded standups.
- • Use IANA identifiers (America/New_York and Asia/Seoul) in calendars so the EDT/EST switch is handled automatically.
- • Late-evening EDT (10:00 PM–midnight) corresponds to lunchtime next-day KST (11:00 AM–1:00 PM), useful for some scheduled handoffs.