Sam, there's a mini GUI for normal UTime on the client files. You should be able to review and see how it's working, then refine from there.
I've not looked lately, but I'm pretty sure Utime stores first time and stores/compares to 'current' time in Epoch time notation.
And, searching our releases thread for UTime brings up several different releases. It seems UTime was one of the most re-done releases Megiddo ever created. SQL, Ultimate, GUI UTime, several exist. Just review how those do it, then when stuck, give a thought out question describing your challenge, along with any errors.