Thread:CMONYALL/@comment-5067079-20140419213500/@comment-3991817-20140420134825

The game will detect it if you open the game at a date that is before the furthest date you have ever played. Example: I played the game at 14:00 today. If I set my device's date and/or time to anything before that and I open the game, I will instantly get a message about time cheating. But, if I changed the time to 14:30 today (even though it is already 15:47 now), I won't get a warning.

It all has to do with the last time you played. If you don't set the dat back to before that time there is no problem. It only becomes a problem when you play before the time you last played. And that is also when you need to put your building in and out of the warehouse to reset their accumulation times.