★ TIME CONVERTER · TIME & DATE · SEOUL
Watch the date: noon in Seoul is still the night before in America. At 12:00 KST on October 24, 2026, it is 03:00 UTC the same day, but 11:00 p.m. EDT on October 23 in New York, 10:00 p.m. CDT in Chicago, 9:00 p.m. MDT in Denver, and 8:00 p.m. PDT in Los Angeles. Seoul is UTC+9 all year with no daylight saving, so the Seoul side never shifts — only the US side moves with its seasons. Enter any Seoul date and time below.
Seoul runs thirteen hours ahead of New York in summer and fourteen hours ahead in winter — the gap changes by an hour only because America springs forward and falls back while Seoul does not. That is why a Seoul meeting time that works in October can land an hour off in January if you subtract a fixed number. This converter reads the real zones for the date you enter, so both the clock time and the date come out right.
Korea Standard Time (KST) is UTC+9 year-round, with no daylight saving in current practice. The converter takes the Seoul wall time you enter, resolves it to a single UTC instant using real zone data (Intl, time zone Asia/Seoul), then reads that same instant in UTC and in the four US zones (America/New_York, America/Chicago, America/Denver, America/Los_Angeles). US daylight saving is therefore handled by the zone data for the date you enter, not by a fixed subtraction: the Seoul-to-Eastern gap is 13 hours in US daylight time and 14 hours in US standard time, and the US date is usually the day before the Seoul date. All times are shown in 24-hour format with the zone abbreviation for that date.
Setup: 12:00 KST on 2026-10-24.
Line 1 — UTC. 12:00 minus 9 hours = 03:00 UTC on 2026-10-24.
Line 2 — Eastern. 03:00 UTC is 23:00 EDT on 2026-10-23 — the date shifts back a day.
Line 3 — Central. 03:00 UTC is 22:00 CDT on 2026-10-23.
Line 4 — Mountain. 03:00 UTC is 21:00 MDT on 2026-10-23.
Line 5 — Pacific. 03:00 UTC is 20:00 PDT on 2026-10-23.
Winter: 12:00 KST on January 15, 2027. That is 03:00 UTC on January 15, 10:00 p.m. EST on January 14 in New York, 9:00 p.m. CST in Chicago, 8:00 p.m. MST in Denver, and 7:00 p.m. PST in Los Angeles. Note the abbreviation change: EST, not EDT — America has fallen back while Seoul has not moved.
Midnight in Seoul: 00:00 KST on October 24, 2026. That is 15:00 UTC on October 23, 11:00 a.m. EDT in New York, 10:00 a.m. CDT in Chicago, 9:00 a.m. MDT in Denver, and 8:00 a.m. PDT in Los Angeles — all on October 23. A Seoul midnight is an American morning.
| Output | Formula | What it means |
|---|---|---|
| UTC | Seoul wall time resolved via Asia/Seoul | 03:00 UTC at the defaults — the single instant every zone shares. |
| Eastern | Same instant in America/New_York | 23:00 EDT (2026-10-23) at the defaults — note the date shift. |
| Central | Same instant in America/Chicago | 22:00 CDT (2026-10-23) at the defaults. |
| Mountain | Same instant in America/Denver | 21:00 MDT (2026-10-23) at the defaults. |
| Pacific | Same instant in America/Los_Angeles | 20:00 PDT (2026-10-23) at the defaults. |
The conversion is exact for the date and time you enter, because every zone is read from real zone data rather than a fixed offset. The one thing it cannot do is predict a government's future zone change: if Korea or the US changed its daylight-saving rules, times after that change would follow the new rules once zone data is updated. Times are shown in 24-hour format; if you read them as 12-hour times, 23:00 is 11:00 p.m. and 03:00 is 3:00 a.m. The converter covers the four mainland US zones; it does not cover Alaska, Hawaii, or US territories. Error policy: missing, malformed, or nonexistent dates and times are reported as errors rather than converted.
Bright Side Kit. "Seoul Time Converter: KST to US Time." https://brightoolbox.com/seoul-time-converter/ Accessed October 24, 2026.1:00 a.m. the next day in Seoul during US daylight time, and 2:00 a.m. the next day during US standard time. Seoul is 13 hours ahead of Eastern in summer and 14 hours ahead in winter.
Only in winter. In US daylight time (roughly March to November), Seoul is 13 hours ahead of New York; in US standard time it is 14 hours ahead. Seoul itself never changes — America does.
No, not in current practice. Korea Standard Time is UTC+9 all year. That is why the Seoul side of this converter never shifts, while the US side moves an hour with the seasons.
Because Seoul is 13 to 16 hours ahead of the US. Noon in Seoul is still the previous evening in America, so any Seoul morning maps to a US time the day before. Enter the Seoul date and the converter shows the US date for you.
16 hours in US daylight time, 17 hours in US standard time. Noon in Seoul is 8:00 p.m. the day before in Los Angeles in October, and 7:00 p.m. the day before in January.
Korea Standard Time. It is the time zone for South Korea, fixed at UTC+9. Do not confuse it with JST (Japan Standard Time), which is also UTC+9 but a different zone name.
Pick a Seoul morning or an American evening. 9:00 a.m. in Seoul is 8:00 p.m. the day before in New York in summer (7:00 p.m. in winter); 9:00 a.m. in New York is 10:00 p.m. the same day in Seoul in summer (11:00 p.m. in winter).
Yes. 23:00 means 11:00 p.m. and 03:00 means 3:00 a.m. The zone abbreviation shown (EDT, EST, CDT, and so on) is the one in force on the date you entered.