Time difference of dual booting between Linux and Windows

Created: 2022-08-06
Tags: #fleeting

But why??

Computer has TWO MAIN CLOCKS

Hardware clock

or RTC (real time clock) 
or CMOS/BIOS clock.

This clock is outside the operating system,
It's on your computer’s motherboard.
It keeps running even if system is powered off.

System clock

is inside your operating system.

So why is there a time difference on dual booting?

Let's explain how computers read time
Computer is powered on...
...then HARDWARE CLOCK is read and used to set the SYSTEM CLOCK. The os then uses SYSTEM CLOCK to tracking time.

IF -> OS makes any changes to SYSTEM CLOCK ( like changing time zone etc )
THEN -> SYSTEM CLOCK syncs this info to HARDWARE CLOCK.

By default,
Linux assumes time stored IN hardware clock is UTC
Windows thinks time stored IN hardware clock is local time.

Fix it by

timedatectl set-local-rtc 1

References

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Table Of Contents
Time difference of dual booting between Linux and Windows
Computer has TWO MAIN CLOCKS
Hardware clock
System clock
So why is there a time difference on dual booting?
References