On Wed 05 Aug 2020 at 07:57:07 (-0400), Carl wrote: > Optimum Online is out here (Long Island). When I lost internet service, system time almost instantly switched to December 13, 2017 at 00:00 or so. If I connect the computer via my phone hotspot, NTP corrects the time rather quickly. As soon as I turn off the hotspot, it reverts to 2017. > > Why? > > Debian Buster, freshly updated. New CMOS battery? Cheers, David.