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Date-fns uses the native Date object which makes the same mistake, but then has a bunch of additional mistakes like not accounting for timezones and being painful to use. Date-fns can resolve some of these issues, but it's generally too simple to do a good job. It's great for manipulating timestamps in the user's local time zone, but beyond that it starts becoming difficult to get right.

Luxon is great! You’re correct about its origin. I use Luxon both for exiftool-vendored and PhotoStructure.

The new temporal api discussed in TFA includes more robust calendar support and more flexible zoned DateTime than Luxon afaict.

Dayjs works good either.