material library

Conversions between kalender's value types and the ones in package:flutter/material.dart.

Import this alongside package:kalender/kalender.dart where an app hands kalender values to a Material API, or the other way round:

final picked = await showTimePicker(context: context, initialTime: time.toTimeOfDay());
final time = picked?.toKalenderTime();

It is a separate entry point so that importing package:kalender/kalender.dart does not name a Material type.