I am guessing that it is normal for Alzheimer's suffers to have great difficulty in telling the time.my wife finds it very difficult if not impossible.she insists we need new clocks as they all tell the wrong time.she also starts to get ready to go out hours before we need to go. I have tried various ways to get her to delay things but she still wanders round getting things ready.then close to the time to go she will decide she has the wrong clothing on.