What is UTC?
UTC, or Coordinated Universal Time, is the primary time standard by which the world regulates clocks and time. It is not adjusted for daylight saving time and is the modern continuation of Greenwich Mean Time (GMT), with some slight modifications. UTC is a neutral time standard, not associated with any specific location.
Example of Mapping UTC to All US Time Zones:
During Daylight Saving Time (DST), which runs from the second Sunday in March to the first Sunday in November, the clocks are set forward by one hour.
| Your Time Zone |
Difference from UTC (hours) |
Conversion to Standard Time 11:59 pm UTC equals this time in your timezone |
Conversion to Daylight Savings Time 11:59 pm UTC equals this time in your timezone |
| Chamorro Standard Time (ChST)* | UTC+10 | 9:59 PM (ChST) | N/A |
| Atlantic Standard Time (AST)* | UTC-4 | 7:59 PM (AST) | N/A |
| Eastern Standard Time (EST)/ Eastern Daylight Time (EDT) |
UTC-5 | 6:59 PM (EST) | 7:59 PM (EDT) |
| Central Standard Time (CST)/ Central Daylight Time (CDT) |
UTC-6 | 5:59 PM (CST) | 6:59 PM (CDT) |
| Mountain Standard Time (MST)/ Mountain Daylight Time (MDT)* |
UTC-7 | 4:59 PM (MST) | 5:59 PM (MDT) |
| Pacific Standard Time (PST)/ Pacific Daylight Time (PDT) |
UTC-8 | 3:59 PM (PST) | 4:59 PM (PDT) |
| Alaska Standard Time (AKST)/ Alaska Daylight Time (AKDT) |
UTC-9 | 2:59 PM (AKST) | 3:59 PM (AKDT) |
| Hawaii-Aleutian Standard Time (HAST)* | UTC-10 | 1:59 PM (HAST) | N/A |
| Samoa Standard Time (SST)* | UTC-11 |
12:59 AM (SST) (the next day) |
N/A |
*Note: Arizona, Hawaii, and all U.S. Territories do not observe DST