What is Coordinated Universal Time?
In the most commonly encountered usage, Coordinated Universal Time (abbreviated UTC) is the basis for the worldwide system of civil time. UTC is of particular importance to the astronomical community, where times are almost always given in the 24 hour UTC format. UTC is roughly (but not always precisely) equivalent to Greenwich Mean Time (GMT). To obtain U.S. civil time from UTC, use the following table: Atlantic Daylight Time: subtract 3 hours from UTC Atlantic Standard Time: subtract 4 hours from UTC Eastern Daylight Time: subtract 4 hours from UTC Eastern Standard Time: subtract 5 hours from UTC Central Daylight Time: subtract 5 hours from UTC Central Standard Time: subtract 6 hours from UTC Mountain Daylight Time: subtract 6 hours from UTC Mountain Standard Time: subtract 7 hours from UTC Pacific Daylight Time: subtract 7 hours from UTC Pacific Standard Time: subtract 8 hours from UTC Alaska Daylight Time: subtract 8 hours from UTC Alaska Standard Time: subtract 9 hours from UTC Ha
