Insert an RTC module from pin #1.
/etc/modules
i2c-bcm2708
i2c-dev
rtc-ds1307
# reboot
# apt-get install i2c-tools
# i2cdetect -y 1
# echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
# hwclock --systohc -D --noadjfile --utc
/etc/rc.local
/bin/echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
/sbin/hwclock -s
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