The pattern property (string) sets the date format used when displaying the selected date in the target element.
DayPilot.DatePicker.patterndatePattern value of the selected locale ("M/d/yyyy").
See DayPilot.Date.toString() for supported pattern elements.
const picker = new DayPilot.DatePicker({
target: "start",
pattern: "dd.MM.yyyy",
// ...
});
picker.show();