No overlap — one side will join outside working hours
EST (New York)
KST (Seoul)
00:00
13:00Working
01:00
14:00Working
02:00
15:00Working
03:00
16:00Working
04:00
17:00
05:00
18:00
06:00
19:00
07:00
20:00
08:00
21:00
09:00Working
22:00off
10:00Working
23:00off
11:00Working
00:00+1doff
12:00Working
01:00+1doff
13:00Working
02:00+1doff
14:00Working
03:00+1doff
15:00Working
04:00+1doff
16:00Working
05:00+1doff
17:00
06:00+1d
18:00
07:00+1d
19:00
08:00+1d
20:00
09:00+1dWorking
21:00
10:00+1dWorking
22:00
11:00+1dWorking
23:00
12:00+1dWorking
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between est and kst?
Eastern Standard Time (est) is UTC-4 and Korea Standard Time (kst) is UTC+9. The difference between them is 13 hours.
Where is est used?
Eastern Standard Time (est) is used in USA and surrounding regions. The IANA timezone identifier is America/New_York.
Where is kst used?
Korea Standard Time (kst) is used in South Korea and surrounding regions. The IANA timezone identifier is Asia/Seoul.
How do I convert est to kst?
Use the interactive converter above. Drag the time slider to any est time and the kst equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
EST (New York) is 13 hours behind KST (Seoul). Midday in EST (New York) lines up with 01:00 in KST (Seoul).
EST (New York) runs on America/New_York; KST (Seoul) runs on Asia/Seoul. Together they are 13 hours apart.
Daily overlap window
There is no business hours overlap between EST (New York) and KST (Seoul) during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best times to schedule a meeting
EST (New York) and KST (Seoul) have no shared working window. These slots minimize out-of-hours disruption for both sides.
16:00 New York / 05:00 Seoul⚡ One side off-hours
⚠️ 4h before working hours in Seoul
20:00 New York / 09:00 Seoul⚡ One side off-hours
⚠️ 4h after working hours in New York
15:00 New York / 04:00 Seoul⚡ One side off-hours
⚠️ 5h before working hours in Seoul
Working hours defined as 09:00–17:00 local time for each location.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
EST (New York)7 holidays
Jul 3Independence DaySOON
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Nov 11Veterans Day
KST (Seoul)7 holidays
Aug 15Liberation Day
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
How to work with EST (New York) and KST (Seoul) time zones
Coordinating between EST (New York) (USA) and KST (Seoul) (South Korea) means working around a 13-hour time difference. Since standard business hours don't naturally overlap, meetings usually require one side to shift slightly outside their normal working day.
💡 How to schedule across these time zones
⚡
A 16:00 meeting in EST (New York) means 05:00 in KST (Seoul) (4h before working hours in Seoul).
⚡
A 20:00 meeting in EST (New York) means 09:00 in KST (Seoul) (4h after working hours in New York).
⚡
A 15:00 meeting in EST (New York) means 04:00 in KST (Seoul) (5h before working hours in Seoul).
Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am EST (New York)".
