[Lazarus] DateDif function needed

[Bart]

On 11/13/13, John Landmesser <JohnML at online.de> wrote:
> I'm just a hobbyist, never went to university to study computer science.

So am I.
(For my background, see my userpage on the wiki)

> We don't need to invent the wheel again, because others have solutions
> for that!

Of course we don't have to.
I just gor intrigued by the (at that time already) long thread, and
since no-one gave a solution, I just went for it and gave it my try.

Just because it is fun to do.

Bart