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Does the "date" command retain the correct time? date -> Tue Mar 10 11:12:43 UTC 2026 date -s "2026-03-10 11:00:00" -> Tue Mar 10 11:00:00 UTC 2026 hwclock -w date -> Tue Mar 10 11:00:06 UTC 2026 hwclock -r -> 2026-03-10 11:00:31.104653+00:00 So looks like it does retain the date between power cycles. > >> Also from what I could find online PCA85073A is also not battery-backed. > > I haven't checked, but this looks strange. How will the board retain > the time then, after a power cycle?