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Fixing time on sysvinit and systemd

If you have a system that boot using different GNU/Linux init systems such as sysvinit (aka System 5) and systemd (aka System 500) in addition to proprietary Windows system, you may face incorrect time display on one of the aforementioned system. The difference in time display is dependent on the time difference of your location and the UTC time. Further complication may result from concept like Daylight Saving Time (DST).

If the Bios is set to localtime, you may fix it in systemd boot system using 'timedatectl' command like:
sudo timedatectl set-local-rtc 1

However, if you are using sysvinit and Bios is using localtime, you can set inform the system that local time is being used using 'hwclock' command like:
sudo hwclock --localtime

or to synchronize the hardware clock with system time and inform the system using:
sudo hwclock --systohc --localtime

If Bios is using UTC time, you may revert the change with 'timedatectl' like:
sudo timedatectl set-local-rtc 0

or with 'hwclock' like:

sudo hwclock --utc

or in Windows, we correct time by creating *.reg file to inform system that the hardware clock is using UTC with the following contents:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation] "RealTimeIsUniversal"=dword:00000001


To import the contents into registry, we double click it. Should the registry edit doesn't respond to it on a x86_64 computer, we change the word 'dword' to 'qword' as follows:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation] "RealTimeIsUniversal"=qword:00000001

Should you ever switch between Windows and Linux system, the above command shall help to correct the time change.

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