Maybe the title should be “it is difficult to write a date parsing library”

“Never write your own x” kind of titles come off as arrogant and demotivating.

Maybe some other person will write an excellent date parsing library that will be better than current ones? Maybe they think it is worth to spend some time on it?

These kinds of hard things tend to have libraries that are extremely bloated because everyone uses one library, and that one library has to work for everyone’s use case.

You can see this in the post too, not everyone needs to be able to parse every single date format.

I'll stand by the never roll your own crypto, but never roll your own date parsing library that your DIY crypto library depends would be uber scary