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How well do you know JavaScript's Date class? (a quiz)

10 chrisdemarco 4 7/11/2025, 5:40:11 PM jsdate.wtf ↗

Comments (4)

8organicbits · 17h ago
Reminds me of this classic: https://www.destroyallsoftware.com/talks/wat

I got 12, although multiple choice helped me guess on several.

gregsadetsky · 15h ago
And this compiled list of "falsehoods developers believe" about time..! https://gist.github.com/timvisee/fcda9bbdff88d45cc9061606b4b...
franky47 · 16h ago
This is gold, I can’t imagine the source code (or worse, the spec) that allows those weird quirks.
gregsadetsky · 15h ago
Some interesting test cases + comments - https://chromium.googlesource.com/v8/v8/+/3.0.12.1/test/mjsu...

And a few interesting bits here - https://chromium.googlesource.com/v8/v8/+/refs/heads/main/sr...