Oh and - if you completely generalize the routine that undresses t$, you will have a JSON parser.
That's a job for another day. ;)
As for days, that's easy enough to insert. I'll add a CONST as a toggle for folks who want them, or not.
For the external holidays, I'm still sorting out the format I want to add for future versions. I'm thinking something like:
Exact, 12,25, Christmas
Last, 12, 5, Foo_day
First, 12, 2, Fee_day
12/25 is Christmas
Last Thursday (5) in December (12) is Foo_day
First Monday (2) in December is Fee_day
Flexible enough for mouse holidays, and not so complex as to be indecipherable.