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Help Solved: Time/Date Reset When Booting With No Signals

Hook

Ever since DU... ;-)
Okay, this is really kind of weird and one of my searches have turned up anything on point.

I just got a new 128GB Nexus 6p (yes, I bought a 64GB one in October, but gave that to my Wife). Work requests we turn off our phones at our desk (there are no signals in our building). I do sometimes turn on my phone to check personal information. Today I brought my new 6p in. When I booted it to check something, the time and date had changed to July 27 1970 and the time was (incorrectly also) 12:25pm. As soon as I stepped outside and got a signal, it corrected immediately. I went back inside the building and powered down and then rebooted. Same thing-- date/time had reverted to July 1970 again. So, I assume it's a problem with having no signal, but my old Nexus 5 never had this problem (it also never had Android 7).

I assume manually setting time and date would fix it in the short run, but I'd really like to know what the problem is and if I can fix it so I can keep the phone on automatic date/time. Is it something about the 6P or Android 7?

I do have the latest Dirty Unicorns ROM on the 6p, but I really doubt that's it, although I'll probably try reflashing a pre-DU nandroid just to be sure.

Has anyone seen anything like this before? If this were a desktop or laptop computer, I would suspect it had a dead CMOS battery, but I don't think that applies here... does it (and, yes, I Googled that too and only turned up a CMOS image sensor).

Any help would be appreciated, even pointing me to something my search failed to turn up.
 
I'm guessing you have Settings -> Date & time -> Automatic date & time toggled which says "Use network provided time [zone]".

Have you tried turning this off once your date/time is properly set?

I do agree that it shouldn't behave like that (i.e., reverting to some obscure, arbitrary date/time), but give the above a shot...
 
Actually, never mind. After running a bunch of tests, it has to be either DU (and I haven't tested whether it is just the weekly I was on) or the gapps package as it doesn't happen when I flash rooted stock 7.1.1. I'll run some more tests and then run it by Josh.

Yes, I'm sure your recommendation works, Scary, I just became obsessed with trying to figure out why things weren't working as they should. Thanks for your input!
 
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