South Korea to New York

Understanding the -13h Gap: South Korea vs New York

South Korea runs on Korean Standard Time (KST) at UTC+09:00. New York runs on Eastern Daylight Time (EDT) at UTC-04:00, also currently on daylight saving time. That puts South Korea 13 hours behind New York — a difference of -13h at the current offsets.

In practice, when it is 9:00 AM in South Korea it is 8:00 PM in New York on the previous day. Midnight in South Korea is 11:00 AM in New York.New York observes daylight saving time while South Korea does not, so the gap narrows or widens by an hour part of the year.

South Korea to New York time conversion table

About KST (Korea Standard Time)

Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.

About EST (Eastern Standard Time)

Eastern Standard Time (EST) is observed during the winter months in the eastern part of North America. It covers 23 US states and parts of Canada including Ontario and Quebec. EST is the most populous time zone in the United States, home to major financial centers like New York City and global organizations headquartered in Washington D.C. During daylight saving time (March–November), clocks shift to Eastern Daylight Time (EDT, UTC-04:00). The time zone also covers parts of the Caribbean and Central America including Panama, Jamaica, and the Cayman Islands.

Best time to call between South Korea and New York

With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. New York opens at 9:00 AM EDT, which is 8:00 PM in South Korea, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

South Korea and New York have no shared working hours because of the -13h gap. Teams need to alternate early starts or rely on asynchronous handovers.