🇺🇸 The United States observes Daylight Saving Time (DST) every year — a practice of setting clocks forward or backward by one hour to make better use of daylight and save energy. This affects the time difference with countries like South Korea, influencing travel schedules, business operations, and stock market hours.
Here’s a complete guide to the 2025 U.S. Summer Time period, time changes, and city-specific time zones including Eastern, Central, Mountain, and Pacific Time.
2025 U.S. Daylight Saving Time (DST) Period and Schedule
Daylight Saving Time (DST), also known as summer time, is designed to conserve energy and maximize daylight.
In Korea, it is often referred to as 일광시간 절약제. DST plays an important role in global communication, stock trading, and travel between the U.S. and Korea. Let’s take a closer look at the 2025 U.S. Daylight Saving Time schedule.
📅 U.S. Daylight Saving Time Period
In the United States, Daylight Saving Time runs from the second Sunday in March to the first Sunday in November. During this period, Eastern Standard Time (EST) becomes Eastern Daylight Time (EDT).
EST stands for Eastern Standard Time, the regular time zone used by the eastern U.S. However, during DST, clocks are set one hour ahead.
Here’s the official schedule for 2025 U.S. Daylight Saving Time:
- Period: March 9, 2025 (Sunday) to November 2, 2025 (Sunday)
- DST Starts: March 9, 2025 (Sunday) at 2:00 AM → set clocks forward to 3:00 AM (EST)
- DST Ends: November 2, 2025 (Sunday) at 2:00 AM → set clocks back to 1:00 AM (EST)
Therefore, in 2025, Daylight Saving Time begins on March 9 (Sunday) at 2:00 AM EST and ends on November 2 (Sunday) at 2:00 AM EST.
In Korean time, this corresponds to March 9 at 4:00 PM to November 3 at 3:00 PM (KST).
📈 After DST ends, U.S. stock market opening hours change! Check the updated trading hours below.
Check Updated U.S. Market Hours
During Daylight Saving Time, the U.S. adjusts clocks twice a year to make the most of daylight hours.
As a result, the time difference with Korea shifts — 13 hours during DST and 14 hours after DST ends.
Sunday, March 9, 2025, 02:00 → move forward to 03:00 (local daylight time)
Sunday, November 2, 2025, 02:00 → move back to 01:00 (local standard time)
🕑 Eastern Standard Time (EST)
New York, Washington D.C., Boston, Philadelphia, Atlanta, Miami, Baltimore, Charlotte, Orlando, Tampa, Pittsburgh, Cleveland, Cincinnati, Buffalo, Richmond, Indianapolis, Columbus, Rochester, Albany, Providence
🕓 Central Standard Time (CST)
Chicago, Houston, Dallas, Austin, St. Louis, Nashville, Kansas City, Minneapolis, Milwaukee, New Orleans, San Antonio, Memphis, Oklahoma City, Louisville, Tulsa, Madison, Des Moines, Omaha, Baton Rouge, Birmingham
🕕 Mountain Standard Time (MST)
Denver, Phoenix, Salt Lake City, Albuquerque, Colorado Springs, Tucson, El Paso, Boise, Billings, Missoula, Provo, Colorado City, Aurora, Fargo, Santa Fe, Spokane, Shreveport, Sierra Vista, Kalispell, Aspen
🕘 Pacific Standard Time (PST)
Los Angeles, San Francisco, Seattle, Las Vegas, San Diego, Portland, Sacramento, San Jose, Oakland, Anaheim, Fresno, Long Beach, Henderson, Reno, Eugene, Tacoma, Stockton, Santa Monica, Berkeley
✅ Conclusion
In summary, the **2025 U.S. Daylight Saving Time** runs from **March 9 to November 2**. Clocks will move forward one hour in March and back one hour in November. While this system helps optimize daylight usage, it also changes the time difference with Korea, so be sure to plan your work or travel schedules accordingly.
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