Best to avoid time altogether, its a man made daft invention to split seasons up fro farming and we took it too far. If non local events are time handled then errors happen. I prefer event driven and only use very local timers for events if at all but extremely local and very temporary.
I suppose the moon is slowing more than us since its likely it that we are dragging with our waves trying to pull it down as it pulls our water up. And all the while we are accelerating away form the centre 
So we better be even more careful with times on moon bases