(48) DATE->NUM, NUM->DATE, ->EXCELDATE, EXCELDATE->, DTDIFF

[HP67]

Thanks for the tips on hidden variables. I'll play around with that later.

I don't use a lot of globals (and seldom use locals either) but I have some astronomical stuff I'm working on and I keep things like position and UTC offset in globals. I just don't like seeing that stuff in the HOME menu so for now it all goes in a SETTINGS directory but then you have to change to that directory if you use the libraries that access them from anywhere else.