Range select with two fields

To have a a range selection with two fields that are linked follow this instruction:

• create both formfields
• enter the following code at the first formfield for 'Custom configuration' and replace <ID_FF2> with the Contao record id of the second formfield

onChange: function(selectedDates, dateStr, instance) {
  picker_<ID_FF2>.set('minDate', selectedDates[0].fp_incr(1));
}

• remove .fp_incr(1) if the selectable date for the second formfield should be the same of the first formfield
• replace the 1 in .fp_incr(1) with another number to define the minimal selectable date for the second formfield after the seleted date of the first formfield