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<details>
<summary>How to enable RTC?</summary>
<p>A: Firstly, insert the C1220 button battery. run the following command:</p>
<pre>
rw
sudo nano /boot/config.txt
#Then change the line: dtoverlay=i2c-rtc,pcf8563 to dtoverlay=i2c-rtc,ds1307
#Test RTC
#Display the current time of the Raspberry Pi
date
#Write the time of Raspberry Pi to DS1307
reboot before next step
sudo hwclock -w
#Read the time of DS1307
sudo hwclock -r
ro
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==References==