I've always hated every date-picker out there... until I used Superhuman, who has a natural language date parser. I wanted that on Merittian, so I asked them on Twitter to open source it.
But I also decided to hack something together. It's not pretty, but it works. So, I thought I'd share.
It's not a package you can install, but you can copy/past/modify away all you want. I am 100% sure it can be improved, and one day I will (unless superhuman open source theirs before then).