Right you are, thanks for getting back to me on this, DuDraig.As I've already said, there are several instances where the day does not progress or is set wrong. It does no harm to playing the game. Just ignore it and keep playing. Constantly bouncing the day count around, especially over weekday/weekend boundaries, can really corrupt your game.
Don't know where you find the time to provide so much help and assistance here, but it is grealy appreciated.
Changing the weekday/day number did seem to have a negative consequence, so I'll just play on and play the game, as you say.