Raspberry PI doesn't have internal hardware clock so NTP synchronization is really important.
Unfortunatelly current Pidora messed up with NTP services, perhaps they are trying to migrade from
NTPD deamon to chrono. So if time synchronization didn't happen you need manually configure and enable NTP service.
Edit
/etc/ntp.config first. Use Nano, VIM or WebFolder web text editor for the task.
- Add
server pool.ntp.org
(other server entries can be commented out)
- Uncomment line
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
(you may need to change IP) to your network base)
Now you can enable NTP service