How to coordinate the clock when dual-booting with Windows

Kevin O'Gorman kogorman at
Mon Dec 11 23:48:25 UTC 2017

On Mon, Dec 11, 2017 at 3:22 PM, Xen <list at> wrote:

> Kevin O'Gorman schreef op 11-12-2017 23:48:
> Linux comes up and thinks it's 2 PM on Dec 11 PST.  Which it is.  But this
>> is weird.  I was expecting it to accept the BIOS time of 10 PM as being
>> local time.
> So why are no servers usable?  Is it possible my router is blocking NTP?
>> Is it possible the standard config file is bad?  This is Ubuntu 16.04.3.
>> Clues, anyone?
> Could be that systemd-timesyncd works fine and you see 2 PM because your
> box has already synced the time.
> So you will have to check for these messages:
> systemd-timesyncd[1718]: Synchronized to time server (
> Before you can be sure about that.
> Other than that, I suppose you did check:
> timedatectl
>  RTC in local TZ: yes
> Yes, here's what I see

 $ timedatectl
      Local time: Mon 2017-12-11 15:39:13 PST
  Universal time: Mon 2017-12-11 23:39:13 UTC
        RTC time: Mon 2017-12-11 15:39:13
       Time zone: America/Los_Angeles (PST, -0800)
 Network time on: yes
NTP synchronized: yes
 RTC in local TZ: yes

Warning: The system is configured to read the RTC time in the local time
         This mode can not be fully supported. It will create various
         with time zone changes and daylight saving time adjustments. The
         time is never updated, it relies on external facilities to
maintain it.
         If at all possible, use RTC in UTC by calling
         'timedatectl set-local-rtc 0'.'

So mine is not working and yours is.  But neither one of us is seeing the
details we expect for the behavior our systems have.  That suggests that
our understanding is wrong.

Kevin O'Gorman
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