The datepicker plugins works just fine with light mode on.
But when it comes to dark mode, datepicker does not run as expected (numbers cannot be seen clearly).
This is still a problem in 2024.
So, are you looking for help? A lot has changed since 2020. Ionic Native is now Awesome Cordova Plugins.
There is no mention of the plugin being used. Either way, all Ionic Native plugins are just wrappers around Cordova plugins. If there is a problem with the plugin, it would be best to open an issue on the respective repo. All Cordova plugins are third-party plugins and have nothing to do with Ionic.
Also since 2020, Ionic has completely re-written their own datetime picker.