My recollection is that the 'incorrect system time at startup' issue has been one that seems to rear its head every now and then. Whilst the preferred solution is to have a battery backed RTC there have been various approaches taken in the WeeWX code base to ameliorate the situation where a battery backed RTC does not exist. These approaches have primarily been because of issues with the RPi but apply equally to any device. I believe the current approach is for WeeWX to block on startup until it sees a system date-time that is the same or more recent that than the weewx.conf file timestamp. The reasoning being that a system with no battery backed RTC or is yet to sync via NTP will revert to a system date-time of somewhere in the 1970s (epoch start ?) and weewx.conf will always be timestamped later than the startup date-time. The obvious issue here is the RPi fake hardware clock that will cause the RPi to reboot with a more recent system date-time, one that could be more recent than the weewx.conf timestamp, and hence could still cause issues with a near but not close enough system date-time. The solution thus relies on the RPi fake hardware clock being disabled.
Perhaps the issue is compounded by changes from jessie to stretch (systemd handling of time sync ?), but I don't see the point in going off down another rabbit hole until we know the current approach does not work. I agree the problem is likely system time related but I have not yet seen anything in any of the recent threads that shows that when properly implemented the current approach is failing. Gary On Friday, 31 May 2019 19:55:46 UTC+10, Liz wrote: > > On Thu, 30 May 2019 04:58:37 -0700 (PDT) > mwall <goo...@lancet.mit.edu <javascript:>> wrote: > > > i am sure there are other scenarios... > > > > m > > Thankyou mwall for a better discussion of the options. > > Liz > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/4b39d5b7-0bed-41ba-985e-8d2e4c884221%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
