RPN83P: RPN calculator for TI-83+ TI-84+ inspired by HP-42S

[bxparks]

(11-09-2024 07:13 PM)Liamtoh Resu Wrote:  Thanks.

I was able to do the DDAYS function after some persistence.

The DATE functions on RPN83P exceed the capabilities of any calculator that I am aware of. They are documented here: https://github.com/bxparks/rpn83p/blob/d...DE_DATE.md

The price of all that functionality is more complexity, but it shouldn't have taken *too* much persistence. I tried to do the best I could given the limitations of the TI-84+ keyboard bindings, and the limited LCD screen space, but let me know if you think I missed something obvious.

With regards to the "YYYY/MM/DD" format, I don't have an HP Prime so cannot comment on how that works. For RPN83P, the "/" button is used as the "division" operator, so it cannot be used as a field-separator. I also cannot use the ISO 8601 format of "YYYY-MM-DD", because the "-" button is used as the "subtraction" operator. The best alternative was the "," button which is a primary unshifted button on the 84+. So a date object is entered as "{2024,11,9}".