Linux – How to stop Linux from changing Windows’s clock

clocklinux-minttimetime zonewindows 8.1

I have a computer (HP-e010nr) that dual-boots Linux Mint 18.3 (Cinnamon, 64-bit) and Windows 8.1 (64-bit). Both are installed via BIOS compatibility mode (the Windows installer refused to use UEFI). My issue is:

When I start Linux, it sees that the system clock is not UTC, so it changes it to UTC (and then displays it 7 hours back to keep the right time). When I start Windows, it expects the system clock to be normal time (not UTC). It displays the clock as 7 hours ahead of my time zone, making timestamps wrong.

I can change the hardware clock to normal time after shutting down Linux, but this is very annoying to do. I would like them to both display the same time if I shut down Linux and booted Windows.

Is it possible to stop Linux from changing the hardware clock so that other operating systems (Windows and Android) will display the correct time?

Best Answer

Run this command to make Linux use local time. This will resolve the issue.

timedatectl set-local-rtc 1 --adjust-system-clock

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You don't want to run NTP or NTPDATE on a virtual machine. It should get its time from the system clock.

Check the UTC value in /etc/default/rcS. Try setting it from no to yes or vice-versa.

While you are at it add an exit 0 line to /etc/default/ntp. Alternatively set the NTPOPTION value to "-q". This will disable NTP on the virtual server.

Windows – dual booted pc: windows 7 clock becomes wrong after booting linux

The problem is that Linux by default sets the system clock to UTC time, while Windows sets it to local time.

As far as I'm aware, Windows doesn't make a distinction between system clock time and local time; there is thus no way to have Windows set the system clock to UTC, short of actually telling Windows your time zone is GMT+0.

You will therefore need to configure your Linux installation to set the system clock to localtime, which can be done via the hwclock command -- see the manual for exhaustive detail, but in general, the following command should serve:

hwclock --set --localtime --date="5/31/2013 12:34:56"

(You may also, more conveniently, be able to issue hwclock --systohc --localtime, to copy the system time to the hardware clock and clue hwclock that it's to manage the hardware clock as local time instead of UTC; on that point, you may also need to edit /etc/adjtime to let the system know that it shouldn't try to treat the system clock as UTC on startup and shutdown.)

Best Answer

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