Post

I made a quiz about the JS Date parser is. It's very easy and you will score very high. jsdate.wtf

jsdate.wtfnew Date("wtf")How well do you know JavaScript's Date class?

@wicky.nillia.ms

11 July 2025

I knew this was a trick question after the earlier two about zero and one. But I never expected it to be this fucked up lol

Sam Rose

@samwho.dev

This whole thing came about at work earlier this week when I realised “0” and 0 give different results. I tried “1”, okay, fine. Then “2” and that’s when I knew I had to make this quiz. Ended up reading the v8 code behind it to weed out other edge cases.

11/7/25, 5:55 pm0 reposts41 likes

Nick Williams

@wicky.nillia.ms

11 July 2025

IIRC it's not even spec'd fully so you can get different results in different environments 🫠

Sam Rose

@samwho.dev

11 July 2025

You can, yeah. It’s why I put the disclaimer at the start.

Nick Williams

@wicky.nillia.ms

11 July 2025

Ah i missed that by diving straight into the seventh circle of hell

naugtur

@naugtur.pl

11 July 2025

I think Iknow how you feel. Back when the term pandemic meant a boardgame, I found out the behavior of splice and tried to figure it out 😂 naugtur.pl/writes/artic...

naugtur.plEverything is an array index - Naugtur's scribbles