Date functions

[Kernelpanic]

@SMcNeill & mdijkens, Thanks for the examples. It's really amazing what you can do with Basic.

@SMcNeill, with your program I have so far tried to "extract" what I think is important to me, namely how many days have passed between two dates. I haven't gotten very far with it yet. - I'm working on it (until the Last Judgment). 

@mdijkens, an error is displayed in your program that I haven't been able to solve yet. Actually, I've tried everything you can possibly try. . . it doesn't want to go away.