Last Connected time needed for script

I am writing a script to check the status of SEP 12.1.6 on our servers.  One of the items they want in the report is the time the client last connected to the management server.  I can see the time they want under Help > Troublshooting > Last Connected.  Does anyone know where this time is stored on the client computer?  It seems like it should be in the registry but I can not find it.  Any help would be appreciated.

Thanks

Mark