I know that most people use TT*ware with Gaz or Daktronics boards. However if you happen to come across an Omega UNT series board, please feel free to use this utility program that will take the UDP packets from the program and make the appropriate translations to show the time on one of these boards. It also has a switch to allow it to show the TOD if need be.
It need to be run on a computer on its own with a TCP network link to the machine running TT*Ware. The board of course is attached via serial port.
Given the very limited target audience, it's freeware, and comes as is.