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i connect RTC to raspberry and when i execute thiese command time set correctly without internet connection :

echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock -s

but when i add these command to rc.local Rpi time wont set and date show Thu Jan 1 03:30:33 IRST 1970

and after boot i must manually enter only sudo hwclock -s to time set ...

why only hwclock -s wont execute in rc.local ?

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I had the same issue, you need to add sudo before the hwclock -s command. Don't ask me why, since I have no idea. I was under the impression that rc.local is always run at highest privileges, but apparently that does not apply to hwclock. Infact most of the other commands I run in rc.local work without sudo. But not hwclock.

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