Comment by alkonaut

> If you're passing raw/unvalidated user input to the date parser you're holding it wrong.

Oh absolutely. But the difference between a sane api and other APIs is that a sane one will fail in a sane way, ideally telling me I’m holding it wrong.

Especially: the key at every turn is to fail hard if there is anything even slightly wrong rather than do something potentially incorrect. Many JS apis seem designed to continue at any cost which is the fundamental problem. You never really want a NaN. You don’t want to coerce strings to [whatever].