Date object

main.dart

extension type const Date.of(DateTime _date) implements DateTime {
  Date(int year, int month, int day) : _date = DateTime(year, month, day);
  
  Date.now() : _date = DateTime.now();
  
  Date.value(int value) : _date = DateTime((value >> 9), (value >> 5) & 0xF, value & 0x1F);
  
  int get value => (_date.year << 9) | (_date.month << 5) | _date.day;
}

void main() {
  print(Date(1, 2, 3).value);
  print(Date.now().value);
  print(Date.of(DateTime.now()).value);
  print(Date.value(Date.now().value));
}