Update time for raspberry pi

The date problem

The raspberry pi doesn’t has a real time clock, so every time start the raspberry pi, we have to resest the time.

manually set the time from ntp server

sudo /etc/init.d/ntp stop
sudo ntpdate 1.cn.pool.ntp.org

Solution 2: set the ntp server

# in /etc/ntp.conf

server 1.cn.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org

Solution 3: setup the RTC module

When using the ntp server, it still delay some time after power up the board. So I try to make use of the RTC module bought online.