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来自「实现linux系统和网络时钟服务器的时间同步,从而可以得到准确的时间.」· 代码 · 共 7 行

The goal of ntpclient is not only to set your computer's clock
right once, but keep it there.

First, a note on typical 1990's and 2000's computer crystals.  They
are truly pathetic.  A "real" crystal oscillator (TCXO) usually has
an initial set error of less than 5 ppm, and variation over time, voltage,
and temperature measured in tenths of a ppm (and an OCXO can reach