In the United States, daylight saving time came to an end in the early hours of Sunday morning,... so those in Korea with business in the U.S. will want to double check their clocks and watches.
The time difference between South Korea and the eastern U.S. is now 14 hours instead of 13,... and the difference with the west coast is 16 hours instead of 17.
Daylight saving time comes back next year on March 10th.