User blog comment:Quiksilvr/The date-time synchronisation error and what you can do about it/@comment-212.17.216.46-20150930114228/@comment-26793627-20151002174909

Regardless of whether the error pops up or not, the servers are out of sync of your game progress if you have launched the game while you are offline. On the other hand, if you have disabled net access while the game is running, sometimes the game behaves as if it is still connected to the servers, even though it is definitely not. When I say 'behave', I mean that you won't get any servicing reserve if you put your car in servicing at this time. Instead, the car servicing happens as though you are online ie. starts counting down faithfully. And that affects all aspects of the glitch, be it servicing time or delivery/upgrade time or drive refill time. The easiest way of checking it is by losing a drive by attempting a time trial ( you can just abort the time trial once the drive is expended, if you wish) and checking if it is getting replenished. If the drive refill counter is stuck at 17m 59s, then you are offline and already accumulating offline servicing reserve time. In my experience, I've realised that the error prompt pops up sooner or later if you continue to stay offline. If you are still not convinced, let the device sleep while the game is running. When you wake it back up, black magic or not,  you'll definitely see the error prompt. Each time, every time. ;)

PS: the erratic behaviour of the glitch is not neccessarily a bad thing. As I've explained in 'Scenario 2', I use this aspect to have my cars delivered to me from servicing even when I'm not connected to the internet.