toShortWeekday method
Implementation
String toShortWeekday() {
switch (weekday) {
case 1:
return "Mo";
case 2:
return "Di";
case 3:
return "Mi";
case 4:
return "Do";
case 5:
return "Fr";
case 6:
return "Sa";
case 7:
return "So";
default:
return "invalid day";
}
}