How to sync RTC to UTC in voxl2?
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 Hello, I am using voxl2. Whenever I connect the battery, the device resets the RTC(Real Time Clock) to 1970-01-01. This is understandable. My issue is that I tried to sync the RTC to UTC using several ways, but I couldn't. Can I know the how to sync the RTC to the UTC?  I tried to use "$ sudo timedatectl set-local-rtc 0", it didn't work. 
  Another approach is using hwclock, but it didn't work either. 
  The last approach is the below command, but I met permission denied, even though I am a root user. 
  How can I RTC to UTC? Thanks, 
 Kay
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 @kay-han VOXL2 does not have an RTC 
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 @Eric-Katzfey Oh, do you mean I can see the "RTC time" by timedatectl, but it doesn't mean voxl2 has the RTC? I see. Thank you for your answer. 
