UTC Time???

Coordinated Universal Time

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Coordinated Universal Time (abbreviated UTC) is the time standard by which the world regulates clocks and time. Computer servers, online services and other entities that rely on having a universally accepted time - use "Coordinated Universal Time" for that purpose. Though there are scientific differences (explained below) between "Coordinated Universal Time" and the time standard known as Greenwich Mean Time (GMT) - in the very broadest sense as understood by non-scientists, "Coordinated Universal Time" in essence is Greenwich Mean Time (GMT). When times are listed as being "UTC" - this is de facto the equivalent of "GMT".

Scientifically speaking, "Coordinated Universal Time" is a time standard based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the Earth's slowing rotation.^[2] Leap seconds are used to allow UTC to closely track UT1, which is mean solar time at the Royal Observatory, Greenwich.

Since the difference between UTC and UT1 is not allowed to exceed 0.9 seconds, if high precision is not required, the general term Universal Time (UT) may be used.^[3]

In casual use, when fractions of a second are not important, Greenwich Mean Time (GMT) can be considered equivalent to UTC or UT1. Saying "GMT" often implies either UTC or UT1 when used within informal or casual contexts. In technical contexts, usage of "GMT" is avoided; the unambiguous terminology "UTC" or "UT1" is preferred.

Time zones around the world can be expressed as positive or negative offsets from UTC as in this list; UTC replaced GMT as the basis for the main reference time scale or civil time in various regions on 1 January 1972.

UTC TIme은 세계협정시 이다.

기준은 세슘원자의 진동수에 의거한 초의 길이로 정했다고 한다..

UTC Time은 프로그래밍에서 중요하다.

우선 로컬 타임으로 생각해보자.

만약 우리나라에서 지금 만들어서 미국으로 보냈다고 치자 그러면 미국에서 그 파일을 받으면 미국에선 미래에 만들어진 파일이 생긴다...-_-

말이 안돼지 않는가?

UTC Time은 이를 해결해준다.

우리나라에서 12시에 만든 파일이 11시간 빠른 미국에서는 1시로 인지 할수 있게하는 기준 시간이다.