time - What is the real code behind digital clocks? Java -

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i know it's kind of naive question, , maybe out of place, wondering secret behind functionality used calculate right timing seconds, minutes, , hours in computers? since, know, computer doesn't create things itself, , numbers doesn't increase in time while adding ones, somehow, in case? explain how exactly? maybe provide java code make better understanding of how it's implemented computer.

these systems rely on real time clock.

this hardware device uses quartz crystal, keeps track of time, , draws next no current, , can remain counting on nothing more button cell few years.

devices gps location devices rely on gps signal time.

still way these devices functions having precise crystal oscillated @ known frequency, these ticks counted calculate time.

in event of drift, next time system boots , talks time server, may update value on rtc.


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