RTC

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1 S5P4418/S5P6818

1.1 Read current datetime

sudo hwclock -r -f /dev/rtc0

The output results are summarized below:
Tue 01 Sep 2009 12:07:52 AM UTC .371098 seconds

1.2 Set and save datetime

sudo date -s "2020-04-20 11:03:00"
sudo hwclock -w -f /dev/rtc0
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