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1.1 ! root 1: ! 2: ! 3: GMT Definition GMT ! 4: ! 5: ! 6: ! 7: ! 8: GMT is an abbreviation of Greenwich Mean Time, the time recorded ! 9: at the Greenwich Observatory in England, where by international ! 10: convention the Earth's zero meridian is fixed. ! 11: ! 12: By definition, COHERENT fixes system time in GMT. It calculates ! 13: local time as an offset of GMT; for example, the time zone for ! 14: Chicago is six hours (360 minutes) behind Greenwich, so the local ! 15: time for Chicago is calculated by subtracting 360 minutes from ! 16: GMT. ! 17: ! 18: ***** See Also ***** ! 19: ! 20: definitions, gmtime(), localtime, time, time.h, TIMEZONE ! 21: ! 22: ***** Notes ***** ! 23: ! 24: The ANSI Standard replaces GMT with UTC (_u_n_i_v_e_r_s_e_l _t_e_m_p_s _c_o_o_r- ! 25: _d_o_n_n_e, or universal coordinated time) for C programming. The ! 26: change is mainly one of terminology rather than substance, as ! 27: some signatories to international conventions object to naming ! 28: the standard for global time after a village in England. ! 29: ! 30: Under international convention, there are two UTC standards: UTC1 ! 31: is based on solar time and is identical to current GMT, whereas ! 32: UTC2 uses atomic clocks that are corrected by comparison with ! 33: pulsars. These standards drift apart as the earth's rotation ! 34: slows; thus, ``leap seconds'' are inserted periodically into UTC1 ! 35: to bridge the difference. ! 36: ! 37: ! 38: ! 39: ! 40: ! 41: ! 42: ! 43: ! 44: ! 45: ! 46: ! 47: ! 48: ! 49: ! 50: ! 51: ! 52: ! 53: ! 54: ! 55: ! 56: ! 57: ! 58: ! 59: ! 60: ! 61: ! 62: ! 63: ! 64: COHERENT Lexicon Page 1 ! 65: ! 66:
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