Board Thread:The Last Sovereign Discussion/@comment-29984007-20180410151643/@comment-31763506-20180626202138

Some JS errors are runtime instead of compilation, and therefore only happen if you trigger them.

EDIT: (I may have done some experimenting with older versions of this and the 3AW calculator searching for bugs, so I know whereof I speak on sneaky runtime errors. But the code definitely increments the day count as written.)