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Welllll… “works right now” is perhaps an overly strong assertion when it comes to day.js. I tried switching from moment to day.js, and within a couple of hours I’d opened two bugs [1][2], both related to incorrect behaviour in corner cases (like generating the incorrect date when near a daylight saving time transition).
The fact that it only took me a few hours to find these suggests there are plenty more bugs like these to find. The fact that these bugs have been open since the start of March with no movement on them suggests they aren’t too interested in correct behaviour (or perhaps they’re just your typical under-staffed open source project).
Maybe I just got super unlucky and ran into the only two bugs here… but it’s not likely.
Luxon and moment.js both handled these cases perfectly. If you’re looking to move from whatever you’re using now, and you can’t wait for the new standard, I’d pick one of those.
[1]: https://github.com/iamkun/dayjs/issues/1816
But how does this compare to Luxon? (https://moment.github.io/luxon/#/why)
If you are considering switching to a (different) date library, I would suggest to hold off. ECMAScript is about to introduce a native date and time API that is much better than the current Date functionality. It may also make the need for a third-party date library obsolete (as long as you do not need to parse custom date formats).
- https://github.com/tc39/proposal-temporal
- https://github.com/tc39/proposal-temporal#polyfills
- https://tc39.es/proposal-temporal/
- https://tc39.es/proposal-temporal/docs/index.html
- https://github.com/tc39/proposal-temporal/issues/1450
- https://tc39.es/proposal-temporal/docs/parse-draft.html
As far as I know, issue #1450 is the last remaining blocker for the standardization. I'd assume that this will be resolved in the next months. So Temporal will likely be officially released with ECMAScript 2023, but browser vendors and other implementors will start shipping it before the offical release.
I prefer date-fns https://date-fns.org
It’s functional and tree shakable!
I’ll have to check out Day.js next time though.