Converting
Coordinated Universal Time
to U.S. Local Time
| Eastern Standard Time | UTC -5 |
|---|
| Central Standard Time | UTC -6 |
|---|
| Mountain Standard Time | UTC -7 |
|---|
| Pacific Standard Time | UTC -8 |
|---|
| Alaska Standard Time | UTC -9 |
|---|
| Hawaii-Aleutian Standard Time | UTC -10 |
|---|
For more, see time zone.
True high-precision UTC times can only be determined after the fact, as atomic time is determined by the reconciliation of the observed differences between an ensemble of atomic clocks maintained by a number of national
time bureaus[?]. This is done under the auspices of the
International Bureau of Weights and Measures (BIPM). However, atomic clocks are so accurate that only the most precise time computations need to use these corrections, and most time service users use atomic clocks that have been previously referenced to UTC to estimate UTC times.
UTC presents problems for computer systems such as Unix which store time as the number of seconds from a reference time. Because of leap seconds, it is impossible to determine the representation of a future date, because the number of leap seconds included in that date is unknown.
UTC is the time system used for many Internet and World Wide Web standards. In particular, the Network Time Protocol is designed as a way of distributing UTC time over the Internet.
The UTC time zone is sometimes denoted by the letter 'Z' for military purposes. Since the NATO phonetic alphabet word for 'Z' is "Zulu", UTC is sometimes known as Zulu time.
Wikipedia's own server uses Coordinated Universal Time as the basis for its Wikipedia article updates list.
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