toDateHM method
Implementation
String toDateHM() {
var time = DateTime.parse(this);
return "${addZeroIfLess10(time.day)}.${addZeroIfLess10(time.month)}.${addZeroIfLess10(time.year)} ${addZeroIfLess10(time.hour)}:${addZeroIfLess10(time.minute)}:${addZeroIfLess10(time.second)}";
}