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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!

this post was submitted on 24 Jan 2025
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