The date property (DayPilot.Date | string) sets the selected date in the date picker.
DayPilot.DatePicker.dateIf you set it to a string, it will be converted to DayPilot.Date automatically. After every user change, this property is updated to the selected date as a DayPilot.Date object.
const picker = new DayPilot.DatePicker({
target: "start",
date: "2026-03-10",
// ...
});
picker.show();