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Time zone converter

Press New York or ＋ 1 hour. Seoul at 2026-01-15 09:00:00 is 19:00:00 in New York the day before, a gap of 14:00:00.

Change the date and the hours, minutes, and seconds here. Press New York or ＋ 1 hour and the other city’s clock changes at once.

Here
There

Clock there

19:00:00

19:00:00 · 14:00:00 · 2026-01-14

Seoul → New York, 14:00:00

Gap
14:00:00
Date there
2026-01-14
UTC
2026-01-15 00:00:00
Hour Clock there Date there
00:00:0010:00:002026-01-14
06:00:0016:00:002026-01-14
09:00:0019:00:002026-01-14
12:00:0022:00:002026-01-14
18:00:0004:00:002026-01-15
21:00:0007:00:002026-01-15

Why this exists

The time calculator adds lengths that are already finished, and Unix time counts seconds. This page turns one city’s wall clock into another city’s wall clock.

Seoul at 2026-01-15 09:00:00 is 00:00:00 UTC, and New York is on standard time that day, so the clock there is 2026-01-14 19:00:00. The gap is 14:00:00.

  1. 01How to use it

    Change the city names under Here and There, the year, month, and day, and the hours, minutes, and seconds, or press − 1 hour, ＋ 1 hour, January 15, July 15, and Swap cities. The clock there and the gap change at once, and a line says what the button just did.

    The sample is Seoul on 2026-01-15 at 09:00:00, aimed at New York. The London and Delhi buttons change only the city under There. The table is the other clock at 0, 6, 9, 12, 18, and 21. Copy takes that table.

  2. 02What you get

    The large clock is 19:00:00. The line beside it shows the gap 14:00:00 and the date there, 2026-01-14, together.

    Press July 15 and the same Seoul 09:00:00 becomes 20:00:00 in New York, with a gap of 13:00:00. Recent results stay in this browser.

    EnteredSeoul → New York

    Seoul → New York, January 19:00:00
    Seoul → London, January 00:00:00
    Seoul → New York, July 20:00:00
    Seoul → Delhi 05:30:00

  3. 03Worth knowing

    The United States moves clocks on the second Sunday of March at 02:00 and back on the first Sunday of November at 02:00. Europe and the UK move on the last Sunday of March and the last Sunday of October at 01:00 UTC. Korea, Japan, China, and India do not use daylight time.

    An hour that was skipped comes back as an error. An hour that happens twice keeps the daylight occurrence and says so. Check an official clock before a flight that matters. Nothing is sent to a server.

Questions

QWhat is 19:00:00?
ANew York when Seoul is 2026-01-15 09:00:00.
QWhat is 14:00:00?
AHow far Seoul is ahead of New York then.
QWhat is 05:30:00?
ADelhi at that same Seoul clock. The gap is 03:30:00.
QWhat is 20:00:00?
ANew York when Seoul is 2026-07-15 09:00:00. The gap is 13:00:00.

How this page works it out

This page turns one city’s wall clock into another city’s wall clock. Seoul at 2026-01-15 09:00:00 is New York at 2026-01-14 19:00:00, a gap of 14:00:00. That same clock is London at 00:00:00, a gap of 09:00:00, and Delhi at 05:30:00, a gap of 03:30:00.

Seoul at 2026-07-15 09:00:00 is New York at 2026-07-14 20:00:00, a gap of 13:00:00, and London at 01:00:00, a gap of 08:00:00. January 15, July 15, ＋ 1 hour, and Swap cities change the large clock at once.

Only the usual United States and Europe daylight rules are built in, on fixed weekdays. A skipped hour is an error, and an hour that happens twice keeps the daylight one. Check an official clock before a flight that matters. Nothing is sent to a server.

  • # time zone
  • # 19:00:00
  • # 14:00:00
  • # daylight