I have no experience with Globe Caster, but I did a search for you on the forum and came up with this:
https://globalstreams.com/support/forum/viewtopic.php?t=1481&highlight=clock+onair&sid=13c5f25ea4c938feb7019796567d8449
I hope it helps. Here’s the content of it:
The current time can be done by keeping the CG application open at the same time as Switcher, and in CG, right-click on the workspace, and choose Time Display. It’ll pull the time off the system clock, and as long as you keep it open in the CG application, it’ll continue to update. DON’T try saving out a project with this feature, and loading it into Switcher – the time won’t update.
If what you’re going for is the display of a sports play clock on screen, what we would often do is a live shot of the game clock cropped into the screen with a switcher wipe.
Joe Bourke
Art Director / WMUR-TV