What does utc mean in time zones

But local times could differ from one another by seconds or even minutes — a frustrating situation when you're running late and want to know if you'll catch your train at the station or not. Lines of latitude, which run east to west around our planet, had always been measured from the equator.

But there was no universally agreed-upon equivalent for lines of longitude, which run north to south. At the conference, 41 delegates from 25 countries chose to set the prime meridian — the zero point for longitude lines — as passing through Greenwich, England , according to TheGreenwichMeridian. DST was never practical and will eventually be phased out obsolete. Standard Date Format Virtually the entire world formats time as Hours:Minutes:Seconds hours listed before minutes, minutes listed before seconds.

The date format Year-Month-Day has become widely accepted as a standard in many countries. Year The United States and many other countries use the Christian Gregorian calendar to mark years. This calendar has become a standard in such worldwide industries as aviation, and international commerce and trade -- however, other calendars do exist.

PST Coordinated Universal Time abbreviated to UTC is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar timeat Prime meridian, and is not adjusted for Daylight Saving Time. Time zones are usually defined as differing from UTC by an integer number of hours, although the laws of each jurisdiction would have to be consulted if sub-second accuracy was required.

Several jurisdictions have established time zones that differ by an odd integer number of half-hours or quarter-hours from UT1 or UTC. If only milliseconds precision is needed, clients can obtain the current UTC from a number of official internet UTC servers.

For sub-microsecond precision, clients can obtain the time from satellite signals. UTC is also the time standard used in aviation, e. Weather forecasts and maps all use UTC to avoid confusion about time zones and daylight saving time. Amateur radio operators often schedule their radio contacts in UTC, because transmissions on some frequencies can be picked up in many time zones.

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