EST vs CST vs MST vs PST: What's the Difference?
Published May 2026
The continental United States stretches across roughly 2,800 miles of land and four primary time zones. From the eastern coast of Florida to the Pacific shore of California, the local clock can differ by three full hours. For travelers, remote workers, and anyone scheduling cross-country calls, knowing the difference between EST, CST, MST, and PST is essential.
An Overview of U.S. Time Zones
The continental U.S. is divided into four main time zones. From east to west, they are Eastern, Central, Mountain, and Pacific. Each zone is one hour apart from the next. The country also includes Alaska Standard Time and Hawaii-Aleutian Standard Time, but those fall outside the continental discussion.
Eastern Standard Time (EST)
EST is UTC-5, shifting to UTC-4 during daylight saving time (then called EDT). It covers cities like New York, Washington, Atlanta, Miami, Boston, and Philadelphia. Because most major financial markets and federal offices operate on Eastern Time, EST often acts as the country's default business clock.
Central Standard Time (CST)
CST is UTC-6, shifting to UTC-5 during DST (CDT). It runs through the heart of the country, covering Chicago, Houston, Dallas, San Antonio, Minneapolis, New Orleans, and most of the Mississippi River corridor. CST is exactly one hour behind EST.
Mountain Standard Time (MST)
MST is UTC-7, shifting to UTC-6 during DST (MDT). It includes Denver, Salt Lake City, Albuquerque, and most of the Rocky Mountain states. Arizona is the major exception. While the state sits inside the Mountain zone, it does not observe daylight saving time, so its clock matches Pacific Time during the summer months.
Pacific Standard Time (PST)
PST is UTC-8, shifting to UTC-7 during DST (PDT). It includes Los Angeles, San Francisco, Seattle, Portland, and Las Vegas. PST is three hours behind EST, which is the longest gap within the continental U.S.
UTC Offsets at a Glance
- EST: UTC-5 standard, UTC-4 daylight
- CST: UTC-6 standard, UTC-5 daylight
- MST: UTC-7 standard, UTC-6 daylight (UTC-7 year-round in Arizona)
- PST: UTC-8 standard, UTC-7 daylight
Daylight Saving Time Impact
Most U.S. states observe DST, moving clocks forward on the second Sunday of March and back on the first Sunday of November. The result is a brief period each spring and fall when the offset between U.S. time zones and other countries shifts. For example, the gap between New York and London is normally five hours, but it can briefly become four or six hours during the transition weeks.
Coast-to-Coast Meeting Examples
A 9:00 AM meeting in New York is 8:00 AM in Chicago, 7:00 AM in Denver, and 6:00 AM in Los Angeles. Most national companies aim for an 11:00 AM to 2:00 PM Eastern window because that overlap covers full business hours in every continental zone. Meetings that start earlier than 11:00 AM EST often exclude the West Coast, which is still warming up its day.
Travel Examples
A nonstop flight from New York to Los Angeles takes about six hours, but the local clock advances only three hours due to the time zone change. Flying east is the opposite. A return red-eye that leaves Los Angeles at 10:00 PM PST lands in New York around 6:00 AM EST. Always rely on the local time printed on your boarding pass rather than mental math.
Remote Work Scheduling Tips
- Anchor recurring meetings on a single time zone to avoid drift during DST.
- Rotate early and late slots so the same team is not always inconvenienced.
- Block focus time before 11:00 AM EST or after 2:00 PM PST.
- Use the Meeting Planner to compare overlapping working hours.
Frequently Asked Questions
Which U.S. time zone is earliest?
Eastern Time is the earliest of the four main continental zones. The day begins there before anywhere else in the contiguous U.S.
How many hours apart are EST and PST?
EST is three hours ahead of PST year-round, both during standard and daylight saving time.
Does every state follow DST?
No. Arizona (except the Navajo Nation) and Hawaii do not observe daylight saving time.
Which cities use CST?
Chicago, Houston, Dallas, Minneapolis, San Antonio, Memphis, Nashville, and New Orleans are among the largest CST cities.
Need to plan a coast-to-coast call? Use the Meeting Planner to compare working hours instantly.