Epoch Time – Shadow Keys.
Some information on Citrix Presentation Server Shadow Keys and their use of EPOCH time.
HKCUSoftwareMicrosoftWindows NTCurrentVersionTerminal ServerLastUserIniSyncTime
The key is in epoch time, which is seconds since January 1, 1970. Here’s a quick calculator –
This ensures that the shadow keys do not overwrite settings in the mandatory profile, since the mandatory profile will always show up as being newer.
A good article on the topic –