Setting the Time and Date
Linux provides a system time and date; your computer hardware provides a hardware clock-based time. In many cases, it is possible for the two times to drift apart. Linux system time is based on the number of seconds elapsed since January 1, 1970. Your computer’s hardware time depends on the type of clock chips installed on your PC’s motherboard, and many motherboard chipsets are notoriously subject to drift.
Keeping accurate time is important on a single workstation, but it is critically important in a network environment. Backups, scheduled downtimes, and other network-wide actions need to be accurately coordinated.
The Ubuntu installer sets the time and date during the installation process when it asks for your location. ...
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