When string format contains a dot, the date is invalid

I tried to convert date from a sting, it looks like if the string contains a dot, the date is invalid.

Check this example translating format in nl language to date. The first one fails, the second works fine in the console.

https://codesandbox.io/s/wandering-fog-yhgmk?file=/src/index.js

Start by running the linked CodeSandbox example from src/index.js and compare the two date-format cases, including the Dutch locale format containing a dot. Trace the date parsing and locale handling involved; done means the dotted format converts to a valid date while the existing working case remains correct.

Written by the indexing model from the issue text.