After 140 days of uptime my system clock was off by 20 minutes

[Chuck]

I had the same problem and finally stopped using the automatic update which fixed the problem. But it required me to manually reset the time once a month or so by selecting the automatic time/date update and once corrected I went back to manual update.

Finally I fixed it by using a lux sensor (tempest weather) to adjust the lights so that it was light level activated and not time activated. I have light levels for every room and the north facing rooms have lights come on much earlier than the south facing rooms. Days like today with heavy rain clouds coming over started turning on the lights in the middle of day in the north facing rooms. Once the clouds passed on they went off as the lux reading when up.

Here is a graph of the light level outside. Below 8000 lux the lights in the north facing rooms go in. Light dropped from 111,000 lux to less than 3000 lux in an hour.

Chuck



> On Jun 18, 2022, at 5:45 PM, Jeffrey Lomicka <JeffreyLomicka at comcast.net> wrote:
> 
> It corrected itself when I unlocked the date/time control panel.
> 
> This was affecting when lights came on .  We were starting to ask "why isn't that light on yet?"
> 
> Sierra on a Mac Pro.
> 
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