Day.js – Fast 2kB alternative to Moment.js with the same modern API

Considering that they tend to stay forever, I'd rather wait for them to be well designed than rushed and half-baked.

Luxon has been my go to lib for date and time but will try this out.

I'm a fan of Moment... it's served me well for most of a decade, including in some really heavy scheduling/timetable applications. The size of importing Moment is really fairly negligible for a full-scale single page app. The one drawback I find with it is the overhead for creating new Moment objects. You never want to, for instance, run through a for/next loop of SQL dates and convert each into a Moment for sorting. If you must have them as Moments, you really need to cache once and compare later. Usually in my code I even avoid writing `new Moment()` within a control structure that only needs the current day or hour, and I set up an interval to run permanently in a utility class to just cache a recent Moment every 10 seconds or so, for comparison wherever else it's needed in the code.

That's the only real issue for me with Moment and I'm not sure this lib would change that... especially if I need to extend it for various uses every time it's called, which for me would be a rather large drawback that would end up polluting lots of modules with extra lines of code for specific date comparison purposes.

I never use any date library and I never had a problem with it.

I just use what the native Date() object offers.

Other devs always say "Just wait, one day it will fall on your feet".

But this has been going on for many years, in which my software has served millions of users and nothing ever fell on my feet. I think the complexity of a library like this (423 files, 1433 commits, 53004 lines of code) would have created more problems during this time. So not using one is a net positive.

Any minimal code example of what is prone to break without a date library and how this date library is supposed to prevent it?

Examples of essential complexity you have to worry about if you want your code to be correct, and even if you want to test/detect all issues that can/do come up:

- https://infiniteundo.com/post/25326999628/falsehoods-program...

- https://infiniteundo.com/post/25509354022/more-falsehoods-pr...

In my experience engineers will often brush these sorts of things off as “edge cases”, but really all of these complexities are just how dates and time work in the real life (I’d argue that they’re just “normal cases” to test for)… So any anomaly in software will cause real problems of varying importance for users.