Can TrueTime allow me to have the same time for all users? (question)

I implemented trueTime into my swift project and found that when the time was changed in the settings it did not affect the trueTime time, which is exactly what I want. However, when I closed the app and changed the time manually then went back in the trueTime time had changed. Am I implementing it incorrectly? Currently, I am starting the connection in view did load and checking for the time on a one-second timer?