It does appear that removing fake-hwclock and installing ntp might enough. 
On a new install, I removed fake-hwclocked, installed ntp, and disabled 
networking. On reboot the time stayed at the "default".
My net, if you are running WeeWX on a computer without an RTC, do your 
homework... read the logs, test network slowness/failures, etc.  
Or just spring for a RTC ;)
rich


On Tuesday, 12 March 2019 22:44:26 UTC-4, vince wrote:
>
>
>> On Tue, Mar 12, 2019 at 1:48 PM vince <[email protected]> wrote:
>>
>>>
>>> Yes - systemd will run its own (not so good) time sync function by 
>>> default.  You really don't have to disable it, if you install ntpd systemd 
>>> detects that and lets ntpd drive things re: time. 
>>>
>>>
>>>
> On Tuesday, March 12, 2019 at 3:20:15 PM UTC-7, Thomas Keffer wrote:
>>
>> But, does it still record the time and try to use that on startup?
>>
>>  
> I don't know....
> Certainly no harm in disabling it in systemd to try to make sure, but then 
> also do the normal disabling of fake-hwclock too I guess.
>
> Bottom line is we probably want a system with no battery-backed-up clock 
> to power up cleanly with a time old enough so weewx does its "wait for good 
> time before starting" thing.   That was something like 'wait until the 
> system clock is newer than the modification date of weewx.conf' or the 
> like, wasn't it ?
>
> This stuff'll make you crazy.
>
>

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