Ok the ionic datetime component horror ended. I got it working good enough but I'm not proud of my code. The whole thing is a giant hack parsing dates to and from strings, switching locales, setting months and days and using the month as a daypicker as this fucking component does not allow me display day names in it, only month names. Such a mess... at least now I can work on the stuff that matters.
Actually though about making this open source... I reconsidered.