Hello, i made a simple html field with a calendar where the customer can click on multiple dates.
These dates are shown in the formular but not saved (as i understand HTML content is not saved).
How can i save this content in a hidden text field? i really dont understand what i have to add to copy the content from my field 1:1 to the hidden text field?

<!-- HTML -->
<input type="text" id="datePicker" name="datePicker" placeholder="Wählen Sie bitte einen oder mehrere Tage aus,">

<!-- Flatpickr Styles und Script -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/flatpickr/dist/flatpickr.min.css">
<script src="https://cdn.jsdelivr.net/npm/flatpickr"></script>
<script src="https://npmcdn.com/flatpickr/dist/l10n/de.js"></script>

<!-- Flatpickr Konfiguration -->
<script>
flatpickr("#datePicker", {
locale: "de",
mode: "multiple", // Erlaubt Auswahl mehrerer einzelner Tage
dateFormat: "d.m.Y",
minDate: "today",
maate: "maate",
disable: [
function(date) {
// Gibt true zurück, wenn der Tag deaktiviert werden soll
// 0 = Sonntag, 6 = Samstag
return (date.getDay() === 0 || date.getDay() === 6);
}
]
});
</script>