Currently on my SL6087, the RTC is updated with the time from the GPS module. I find the RTC drifts, so the time is refereshed whenever I get a GPS lock. This all works fine for a bit, then after a while (generally after a few days of running) I cannot update the RTC using adl_rtcSetTime or via AT+CCLK anymore. Here’s and example of trying to put the clock back 24 minutes
Only if I completely power the modem down (including the RTC) and power back up can I configure the time again.
This thread also mentions not being able to set the time with AT+CCLK
Is this a common or known issue?