How to coordinate the clock when dual-booting with Windows

[Grizzly]

10 December 2017  at 20:41, Kevin O'Gorman wrote:
Re: How to coordinate the clock whe (at least in part)

>On Sun, Dec 10, 2017 at 12:59 PM, Grizzly via ubuntu-users <
>ubuntu-users at lists.ubuntu.com> wrote:
>
>> 10 December 2017  at 15:52, Colin Law wrote:
>> Re: How to coordinate the clock whe (at least in part)
>>
>> >On 10 December 2017 at 15:45, Liam Proven <lproven at gmail.com> wrote:
>> >
>> >> On 10 December 2017 at 10:42, Colin Law <clanlaw at gmail.com> wrote:
>> >> >
>> >> > The clock is not normally an issue when dual booting.
>> >>
>> >> It bally well is for me!
>> >>
>> >> E.g. if it's set to local time, both OSes move the system clock
>> >> forward or backwards when daylight savings times begins or ends,
>> >> resulting in a 2h discrepancy.
>> >>
>> >> My solution: minimize use of Windows. I boot it a couple of times a
>> >> year, if that, normally.
>> >>
>> >
>> >Interesting, I have never seen that. I assumed the system clock was in
>> UTC,
>> >and so would not change with DST.  You may be right about that though, I
>> >have no evidence either way. However I would have thought it would re-sync
>> >the next time ntpdate or whatever it is that does the auto timesync ran.

>> Its on a tab in date/time that not many people visit, default is off

>> That's what I was hoping, but I cannot find anything about NTP in my
>Windows 10.

Must admit I was unsure if the same controls carry forward to later windoz, (I 
stopped at Win7) it looks like they do

https://www.isunshare.com/windows-10/2-ways-to-change-date-and-time-on-windows-1
0.html

only difference appears that you only see the internet time when you click 
"Change date time"

here it (now) has a number of possible time server, IIRC it came with only two 
(unreliable), the rest I added later

there is a reg entry 

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DateTime\Servers]
@="3"
"1"="time.windows.com"
"2"="129.6.15.29"
"3"="0.uk.pool.ntp.org"
"4"="1.uk.pool.ntp.org"
"6"="ntp2b.mcc.ac.uk"
"5"="ntp2a.mcc.ac.uk"
"7"="ntp2c.mcc.ac.uk"
"8"="ntp2d.mcc.ac.uk"
"9"="ntp.exnet.com"

the chosen NTP server does propagate to other Reg entries

but you can manually add direct in the dialogue if you don't want to delve in 
Registry