The dateTimePattern property (string) specifies the pattern used to format a DayPilot.Date value as date and time.
DayPilot.Locale.dateTimePattern"M/d/yyyy H:mm"This format string uses the pattern syntax supported by DayPilot.Date.toString().
const locale = new DayPilot.Locale("en-custom", {
dateTimePattern: "dd.MM.yyyy HH:mm",
// ...
});
DayPilot.Locale.register(locale);