You can set the time during system boot actually, and from the Debian Documentation they even specify it for use on hardware that doesn’t keep track of time properly. I recommend using NTP though. You can set it up to connect to an NTP server. First install NTP though, using
$ sudo apt-get install ntp
Once it’s installed, navigate to /etc/ntp.conf which you can edit using your favourite text edit. Say, gedit or nano.
$ sudo nano /etc/ntp.conf
I’m not sure if it needs sudo, but you can use it anyway.
You need to know an NTP server to set this. Modify your file to be like so:
logfile /var/log/xntpd driftfile /var/lib/ntp/ntp.drift statsdir /var/log/ntpstats/ statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable server ntp.somedomain.something server ntp.something.else
Replace the somedomain.something and something.else with NTP servers. You can find some hfrom the NTP server home.