dual-boot time issue

[J.Witvliet at mindef.nl]

Hi all,

It seems I'm bothered by an old issue again, though googling tells me, I am not the only person effected....

The general issue arrises when dual-booting:
Ubuntu_18.04 uses UTC, derived from NTP
Windows uses Local Time, derived from hwclock.

Normally the two can co-exists together, except, when stopping Ubuntu, System-D writes its time back to the hwclock.
No big deal for Ubuntu (as it will use ntp), but a source of irritation under Windows.

I do know several suggestions, like:

a)      Make Windows10 use UTC instead of local time.
This would solve everything once and for all FOR ME, but not achievable for others.


b)      Make Ubuntu_18.04 use local time, with: "timedatectl set-local-rtc 1 --adjust-system-clock"
However, I'm about to switch to Kerberos for several services, so I must use a reliable source for time.

It seems that system-d is the culprit, in initiating the writing of the current time back to the bios/hwclock.
Is there anything I can do, to stop system-d causing this inconvenience ?

Kind regards, Hans

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