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/*On change of from_date (=this element) set to_date 2 days after.
termin_reservation___bis = full element name of to_date, form_18 = your form id
*/
var to_date_id = 'termin_reservation___bis';
var to_date = Fabrik.getBlock('form_18').formElements.get(to_date_id);
var from_date = this.get('value');
var newDate = new Date(from_date);
newDate.increment('day', 2);
to_date.set(newDate);