If you have to deal with larger systems that interface with finance or government orgs, you'll end up needing to work with these numbers though. I've heard tha

If you have to deal with larger systems that interface with finance or government orgs, you'll end up needing to work with these numbers though. I've heard that there's not a legal framework for using Common Era dates in certain contexts, which...apparently matters? I've also heard that the gov't even has regulations for enforcing usage, but can't find a reference on that. One could think that it's merely an interface problem but if the database asks for Heisei the easiest thing is to outsource the CE -> Heisei transition to the person filling out the form.