GMT: Greenwich Mean Time , refer to the outskirts of London, the Royal Greenwich Observatory standard time, because the prime meridian is defined by where the warp. That is, zero time zone.
UTC: Coordinated Universal Time, is a time system. It will be appreciated that as the standard time of the earth, atomic time standards based SI.
The relationship between GMT and UTC: The same can be seen as a time, but relatively speaking, UTC time is more accurate in terms of the science and engineering is using UTC time system. GMT is calculated based on the Earth's rotation, a period of about 86,400.002 seconds, it changes with the Earth's rotation cycle varies. UTC-based time SI standards atom, a precise 86,400.00 second period, since the tidal forces and other factors, the Earth's rotation period gradually becomes longer, when the difference in the ± 0.9 seconds, Coordinated Universal Time put forward or dial 1 sec Thus one second dial rearwardly and GMT time (the Earth's rotation) of the same.
CST: Central Standard Time, when you can refer to the respective parts of the world where time zones:
Central Standard Time (USA) UT-6: 00 (U.S. cst Time: 6 hours Save zero zone)
Central Standard Time (Australia) UT + 9: 30 (Australia cst: plus nine and a half hours)
China Standard Time UT + 8: 00 (China cst: plus 8 hours)
Cuba Standard Time UT-4: 00 (Cuba cst: Save 4 hours)
RTC: in linux system we can also see a RTC time, this time commonly called hardware time, that is, RTC is an integrated circuit, commonly referred to as the clock chip time.
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