Time Zone Calculator Usa
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Reviewed by Calculator Editorial Team
This time zone calculator helps you determine the current time in different US time zones, calculate time differences, and understand daylight saving adjustments. Whether you're coordinating with colleagues across the country or planning international calls, this tool provides accurate time zone conversions.
How to Use This Calculator
Using our time zone calculator is simple:
- Select your current time zone from the dropdown menu.
- Enter the current time in your time zone.
- Select the time zone you want to convert to.
- Click "Calculate" to see the converted time.
The calculator will display the converted time, accounting for daylight saving time if applicable. You can also view a visual representation of the time difference using the included chart.
US Time Zones Explained
The United States has four primary time zones:
| Time Zone | UTC Offset | Common Locations |
|---|---|---|
| Hawaii-Aleutian (HAST/HADT) | UTC-10 to UTC-9 | Hawaii, American Samoa |
| Alaska (AKST/AKDT) | UTC-9 to UTC-8 | Alaska |
| Pacific (PST/PDT) | UTC-8 to UTC-7 | California, Oregon, Washington |
| Mountain (MST/MDT) | UTC-7 to UTC-6 | Colorado, Utah, Arizona (except Navajo Nation) |
| Central (CST/CDT) | UTC-6 to UTC-5 | Texas, Oklahoma, Kansas |
| Eastern (EST/EDT) | UTC-5 to UTC-4 | New York, Florida, Georgia |
The Navajo Nation in Arizona observes Mountain Time year-round, while the rest of Arizona observes Mountain Time in winter and Pacific Time in summer.
Daylight Saving Time Rules
Daylight Saving Time (DST) is observed in most US time zones:
- Starts on the second Sunday in March (clocks spring forward 1 hour)
- Ends on the first Sunday in November (clocks fall back 1 hour)
Exceptions:
- Arizona (except Navajo Nation) does not observe DST
- Hawaii and most of Alaska do not observe DST
Note: The US observes DST in the spring and falls back in the fall, while most of the world observes DST in the summer and falls back in the winter.
Time Zone Abbreviations
US time zones use these abbreviations:
| Time Zone | Standard Time | Daylight Time |
|---|---|---|
| Hawaii-Aleutian | HAST (UTC-10) | HADT (UTC-9) |
| Alaska | AKST (UTC-9) | AKDT (UTC-8) |
| Pacific | PST (UTC-8) | PDT (UTC-7) |
| Mountain | MST (UTC-7) | MDT (UTC-6) |
| Central | CST (UTC-6) | CDT (UTC-5) |
| Eastern | EST (UTC-5) | EDT (UTC-4) |
Common Time Zone Scenarios
1. Business Meetings Across Time Zones
When scheduling a meeting between New York (Eastern Time) and Los Angeles (Pacific Time), you need to account for the 3-hour difference. A 9 AM ET meeting would be 6 AM PT.
2. International Calls
When calling from New York (ET) to London (GMT/BST), you need to consider the 5-6 hour difference. A 9 AM ET call would be 2-3 PM GMT/BST.
3. Travel Planning
When traveling from Chicago (Central Time) to Denver (Mountain Time), you need to account for the 1-hour difference. A 9 AM CT arrival would be 8 AM MT.
4. Remote Work Scheduling
When working with a team in San Francisco (Pacific Time) and Seattle (Pacific Time), you don't need to adjust for time zones. However, when working with a team in Denver (Mountain Time), you need to account for the 1-hour difference.
Frequently Asked Questions
What is the time difference between the Eastern and Pacific time zones?
The time difference between Eastern Time (ET) and Pacific Time (PT) is 3 hours. When it's 12:00 PM ET, it's 9:00 AM PT.
Does Arizona observe Daylight Saving Time?
Most of Arizona does not observe Daylight Saving Time. The Navajo Nation in Arizona does observe DST.
What are the standard time zone abbreviations in the US?
The standard time zone abbreviations in the US are HAST (Hawaii-Aleutian Standard Time), AKST (Alaska Standard Time), PST (Pacific Standard Time), MST (Mountain Standard Time), CST (Central Standard Time), and EST (Eastern Standard Time).
How do I calculate time differences for international calls?
To calculate time differences for international calls, you need to know the UTC offset of both locations. Subtract the UTC offset of the destination from the UTC offset of your location to get the time difference.
What is the time difference between the Eastern and Mountain time zones?
The time difference between Eastern Time (ET) and Mountain Time (MT) is 2 hours. When it's 12:00 PM ET, it's 10:00 AM MT.