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Ha, I just fixed a similar thing at work right before Christmas.

If you use java, consider using google error-prone. It has a check for that (and many other things) https://errorprone.info/bugpattern/MisusedWeekYear

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Me too! It's crazy to me that I've never met you or the parent poster but we were living very similar lives the last week of the year due to the same Java DateTime design decision!

Is there something similar for Python or JavaScript?

eslint is the de facto standard for Javascript, there may be rules or plugins to check for date formatting rules.

There is no date formatting in JavaScript's standard library. External libraries tend to just fix this kind of thing with a breaking change.

There is – here’s the spec: https://tc39.es/ecma402/#datetimeformat-objects

Ah yes. I can't use that yet due to lack of browser support so I forgot it existed.

It’s pretty well supported now – even Internet Explorer 11 has partial support. But if you need it, there’s a polyfill here: https://formatjs.io/docs/polyfills/intl-datetimeformat/

There is Pylint for Python

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