System Time
On most UNIX systems, time begins at 00:00:00 January 1, 1970, Greenwich Mean Time (GMT), which is often known as the “epoch.” The kernel maintains a count of the number of seconds that have passed since the epoch and uses this count for everything that is time-related, such as file creation, time stamps, user logging, and how long processes have been running.
GMT or UTC
Historically, time standards have always used GMT as the reference for all other time zones. In 1986, UTC (Universal Time Coordinated) was introduced as the replacement for the international standard for time. UTC is based on atomic measurements, whereas GMT is based on the Earth's rotation. For this reason, UTC is a more accurate value. However, as far as we are ...
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