If your unti is networked, then most likely udp port 123 is blocked and the brightsign can't get to the external time server. If the clock is not set, it displays as all 8s.
Networkable BrightSigns like the HD210 and HD1010 will set their time automatically if they have access to the Internet, assuming the port used to set the date and time, port 123, isn't blocked.
For any unit with a real time clock, you can manually set the date and time using a script, or the files below. Please read the included directions for editing the autoplay.bsp text file to set the date, time, and timezone you want to use.https://www.brightsignnetwork.com/downl ... e_time.zip