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JavaScript Temporal is coming (developer.mozilla.org)
submitted 2 years ago by neme@lemm.ee to c/javascript@programming.dev
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[-] Deebster@programming.dev 18 points 2 years ago

I'll be very happy to not have to use Date any more. Pop quiz, what's in whatnum?

const vday = new Date('14 February 2025');
const whatnum = vday.getDay() - vday.getMonth();

Err, it's 5... Ha, amazing; that's not even the gotcha I meant to demonstrate. getDay returns the day of the week, the day of the month is returned from getDate.

Take two:

const vday = new Date('14 February 2025');
const whatnum = vday.getDate() - vday.getMonth();

So this is 14 - 2 = 12, right? Nope! The day (from getDate) is 1-based whereas month is 0-based, so 14 - 1 = 13.

[-] SaintWacko@slrpnk.net 6 points 2 years ago

Man, I can't remember the last time I used Date. I either use moment or... the other big one. I think it's just a three letter name?

[-] Deebster@programming.dev 2 points 2 years ago

date-fns? It's third in my search results but doesn't ring any bells to me.

[-] Zectivi@sh.itjust.works 6 points 2 years ago

Day.js possibly. It’s a near drop-in for moment since moment is deprecated.

[-] SaintWacko@slrpnk.net 3 points 2 years ago

Yeah, that one! It's a pretty nice library. The difference between it and moment is that date-fns operates on standard Date objects, rather than having its own type

[-] rg_@jlai.lu 4 points 2 years ago

I'm quite lucky because I only had to solve an issue with JavaScript dates once, but what a nightmare it was… I had to understand how timezones worked, that was not fun!

[-] dracs@programming.dev 3 points 2 years ago

Thank god. I've been regularly checking the Github page waiting for it to finally land in browsers. Can hopefully start using the pollyfill for it soon.

this post was submitted on 24 Jan 2025
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