Hi @Seeed_Seraphina thank you for checking. Would you mind trying again, but leaving the device without power for a couple of hours? If I reboot the device relatively fast, there is no issue, however, if there is no power supply attached for a longer period of time, the RTC seems to reset:
Local time: do 2025-08-28 09:15:57 UTC
Universal time: do 2025-08-28 09:15:57 UTC
RTC time: do 1970-01-01 00:00:45
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: no
NTP service: active
RTC in local TZ: no
The software clock jumps back to the last time there was a sync over NTP.