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Working with Linux time is not too
complex, but there's a few things you

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need to understand, and that is
that it all starts with hardware time.

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Hardware time is the time that is
on the BIOS clock of your computer.

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And when you boot your computer,
your hardware time is the foundation

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for the system time in the
system time is your software time.

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So if the hardware time is off, your
system time is going to be off as well.

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And as hardware clocks are not always very
reliable, we like to synchronize time from the Internet.

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That's where NTP comes
in, the Network Time protocol.

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Now, network time protocol is normally
used to synchronize time on your system.

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And there will be an NTP solution on your system that
makes sure that your system time is always up to date.

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So if there is a small difference
between the hardware clock and the system time,

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NTP will take care of the difference
and it will synchronize this difference away.

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If the difference is too big, however bigger than
1000 seconds, then your system is going to refuse

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to communicate with this NTP clock because the difference
is too big and something might be wrong here.

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That is where a command like
hwclock comes in handy. Because in

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hw clock, you can use the
parameter sys2hc to synchronize the system

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time with the hardware clock and
make sure that everything is okay.

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So that ensures that all the
applications that are running on your

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Linux system have the most
reliable time that you can imagine.